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Selina solutions for Class 6 Physics chapter 3 - Force

Selina Concise Physics - Middle School for Class 6 (2018-19 Session)

Selina Selina Concise Physics - Middle School Class 6 (2018-19 Session) Chapter 3: Force

Chapter 3: Force solutions [Page 0]

Write true or false

The frictional force acts in the direction of motion of body

Write true or false

The unit of weight is kilogram

Write true or false

A force can change the direction of motion of a moving body.

Write true or false

A force increases the mass of the body when applied on it.

Write true or false

The force of friction is always disadvantageous.

Write true or false

The sliding friction is more than the rolling friction.

Write true or false

Liquids offer more friction than the gases.

Write true or false

A wet oily road offers more friction than a dry rough road.

Fill in the blank

Force is applied as ...........or ..........

Fill in the blank

On pulling a string, its .................. increases.

Fill in the blank

On squeezing a gum tube, its ................. changes.

Fill in the blank

A moving football when kicked, its ....................... changes.

Fill in the blank

On applying brakes on a moving car, its speed .........................

Fill in the blank

We use ball bearings to ..................... the friction.

Fill in the blank

Friction ....................... the motion.

Fill in the blank

Lubricants are used to ..................... friction.

Match the following columns

 Column A Column B a) Non contact force 1) repel b) Like poles 2)kg c) Contact force 3) gravitational force d) Mass 4) wear and tear e) Weight 5) force of friction f) Friction 6) kgf

Select the correct alternative

A body falls downwards because of

1. electrical force
2. gravitational force
3. mechanical force
4. magnetic force.

Select the correct alternative

A force does not change

1. mass
2. length
3. shape
4. state of motion.

Select the correct alternative

A force to be expressed correctly requires

1. only the magnitude
2. only the direction
3. both the magnitude and direction
4. none of the above.

Select the correct alternative

Friction

1. promotes motion
2. opposes motion
3. acts in the direction of motion
4. is always a nuisance

Select the correct alternative

Friction is reduced by

1. making the surfaces wet
2. making the surfaces dry
3. making the surfaces rough
4. sprinkling sand on the surface.

Select the correct alternative

Friction

1. causes wear and tear
2. produces heat
3. stops a moving body
4. has all the above disadvantages

Select the correct alternative

Friction is increased if

1. an oil is sprayed
2. the surfaces are made wet
3. the surfaces are made dry
4. the surfaces are polished

Chapter 3: Force solutions [Page 0]

Name the term used for the push or pull ?

Give one example  of  force as

a push

Give one example  of  force as

as pull

Give one example  of  force as

a stretch and

Give one example  of  force as

a squeeze

Explain the meaning of the term force.

What effect can a force have on a stationary body ?

What effects can a force have on a moving body ?

What effect can a force produce on a body which is not allowed to move ?

Give one example of produces motion to indicate that the application of a force ?

Give one example of stops motion to indicate that the application of a force ?

Give one example of slows down motion to indicate that the application of a force ?

Give one example of changes the direction of motion to indicate that the application of a force ?

Give one example of deforms a body to indicate that the application of a force ?

State the effect produced by a force in the given  cases :

The sling of a rubber catapult is stretched

State the effect produced by a force in the given cases :

A man pushes a heavy cart

State the effect produced by a force in the given cases :

A player uses his stick to deflect the ball .

State the effect produced by a force in the given cases :
A cyclist applies brakes

State the effect produced by a force in the following cases :

A spring is compressed.

Name the two kinds of forces in nature.

Name the type of force which acts in the following cases:

A coolie lifts a luggage

Name the type of force which acts in the following cases:

A bicycle comes to rest slowly when the cyclist stops pedalling

Name the type of force which acts in the following cases:

A stone falls from a roof

Name the type of force which acts in the following cases:

A comb rubbed with silk attracts the bits of paper

Name the type of force which acts in the following cases:

A horse moves a cart

Name the type of force which acts in the following cases:

A magnet attracts an iron pin

Name the type of force which acts in the following cases:

A boy opens the door

Name the type of force which acts in the following cases:

An apple falls from a tree

Name the type of force which acts in the following cases:

A man rows a boat.

What do you mean by the gravitational force ? Give an example to illustrate it.

Define the term “weight of a body”

What do you understand by the term friction ?

Give an example to illustrate the existence of force of friction.

What is the cause of friction ?

State two factors which directly affect the force of friction.

In which case will there be more friction between the truck and the road : when the truck is empty or when it is loaded ?

Which offers more friction on a body : a glass surface or a wooden surface ?

Name the three kinds of friction.

List three disadvantages of friction.

When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.

The eraser gets smaller and smaller as you use it more and more. Explain the reason.

List three ways of reducing friction.

It is difficult to open an inkpot with greasy or oily hands. Explain.

It is difficult to walk on a wet road. Explain.

Give three examples to illustrate that friction is a necessary evil.

Define

static friction

Define

sliding friction

Define

rolling friction

Arrange the following in descending order :

1. static friction
2. sliding friction and
3. rolling friction?

A body needs a force F1 just to start motion on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is

1. the static friction
2. sliding friction and
3. rolling friction ? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.

Chapter 3: Force solutions [Page 0]

What do you understand by a force ?

Define weight.

Tick the most appropriate answer.

Which of the following is not an effect of force ?

1. Change in the direction of an object
2. Change in the shape and size of an object
3. Change in the mass of an object
4. Change in the position of a stationary object.

Tick the most appropriate answer.

Which of the following is a contact force ?

1. Graviational force
2. Frictional force
3. Electrostatic force
4. Magnetic force

Fill in the blank

.................... is the SI unit of force.

Fill in the blank

Magnetic force is a ................ force.

Fill in the blank

The force acting on a mango falling from a tree is an example of .....................

Match the following.

 Column A Column B 1. Non-contact forces a.perpendicular to surface 2.Catapult b.an act of push or pull 3.Force c.unit of force 4.Normal force d.action-at-a-distance forces 5.Newton e. contact force

true or false

If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.

true or false

Gravitational force is a contact force.

true or false

Like charges always attract each other

true or false

It is possible that a force applied to an object may not bring any change in it.

true or false.

Two equal and opposite forces acting on an object balance out each other.

true or false

Force applied on an object can increase its mass.

true or false

Friction always acts in the direction of motion of an object.

Give an example in which a force can change the direction of an object.

Which force is responsible for supporting the weight of a book placed on a table ?

Which type of force acts on a string pulled from both ends ?

Name the force that is responsible for the falling of a stone from a height to the ground.

What do you understand by magnetic force ?

Why does a rolling ball stop after moving some distance?

Define force. Write its SI unit.

What will happen to an object if two equal forces act on it in opposite directions ?

What do you understand by normal force ?

Why does a charged balloon stick to a wall ?

Why is magnetic force considered as an action-at-a-distance force ?

What are the various effects of force ? State one example of each.

List all the forces acting on a boy sitting on a chair with the help of a suitable diagram.

Differentiate between mass and weight of an object.

Identify the agent exerting the force, the object on which the force is acting and the effect of force in the following situations

Squeezing out the juice from an orange.

Identify the agent exerting the force, the object on which the force is acting and the effect of force in the following situations

Taking out ointment from a medicinal tube.

Identify the agent exerting the force, the object on which the force is acting and the effect of force in the following situations

A child jumping to a height.

Solve the following numerical problems.

Two horses pull a cart in the same direction with a force of 500 N each. Find the resultant force acting on the cart.

Solve the following numerical problems.

Two force of 12 N and 25 N act on a body to the left hand side, while another force of 35 N acts on it to the right hand side. Find the resultant of the forces.

Solve the following numerical problems.

Two persons are pushing a car with a force of 30 N and 70 N in opposite directions. Calculate the resultant force and its direction.

Solve the following numerical problems.

The forces acting on a wooden block are shown in the figure given alongside. Find the resultant of the forces and the direction of the resultant force. Chapter 3: Force solutions [Page 0]

Fill in the blank

More the roughness of a surface, greater is the ........................

Fill in the blank

Rolling friction offers ............. resistance than sliding friction.

Fill in the blank

The force of friction acting between two bodies in contact while at rest is known as................friction.

Fill in the blank

Weight remaining the same, friction is independent of ............. of surface in contact.

Fill in the blank

Sliding friction and rolling friction are types of .................. friction.

Chapter 3: Force solutions [Page 0]

Tick the most appropriate answer.

Force of friction comes into play when a/an

1. object attempts motion
2. moving object tries to stop
3. object is at rest
4. all of the these

Tick the most appropriate answer

Friction always

1. supports motion
2. starts motion
3. encourages motion
4. opposes motion

Tick the most appropriate answer.

Friction is offered by

1. solids
2. liquids
3. gases
4. all of these

Tick the most appropriate answer.

A car skids on a wet or muddy road due to

1. increased friction between the road and the tyres.
2. lubrication of brakes on a wet road.
3. reduced friction between the road and the tyres.
4. streamlined shape of the car

Tick the most appropriate answer.

Friction for an object can be reduced by

1. providing wheels
2. lubricating
3. streamlining
4. all of these

Tick the most appropriate answer.

Friction produces

1. heat
2. change of state
3. electricity
4. pressure

Tick the most appropriate answer.

if you pour some oil onto a floor, the friction would

1. increase
2. decrease
3. remain the same
4. none of these

Fill in the blan

Rolling friction is ........... than sliding friction.

Fill in the blank

Smoother the surface, ................. is the frictional force offered by it.

Fill in the blank

Friction depends upon the ............... of an object.

Fill in the blank

Friction is a type of .................

Fill in the blank

Bicycles use......................to reduce friction between the pedals and the crank

true or false

Friction wears down the parts of machi

true or false

Friction has no relation with our walking or running.

true or false

Friction helps us to grip the objects in our hand.

true or false

Tyres of vehicles are provided with grooved designs to decrease friction.

true or false.

Friction is offered by all the three states of matter.

Match the following.

 Column A Column B 1. Rolling friction a. makig grooved designs 2. Static fritcion b. regular oiling 3.Reducing friction c.a book placed on a table top 4.Increasing Friction d. wheels of a car

A child tries to slide a wooden block on the top of a table, but she is unable to get a smooth movement. What material do you suggest she should use in between the block and the table to get a smooth movement ?

Why is difficult for a pen to leave a mark on a highly smooth plastic sheet ?

Name the force responsible for opposing the motion between two bodies in contact.

Name a method used to reduce friction.

When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.

Define rolling friction and give an example where rolling. friction comes into play.

How can sliding friction be changed into rolling friction easily ?

Why do wrestlers rub powder on their hands before getting into the ring ?

List the various states of matter that offer frictional force ?

Define friction and explain how it is useful to us.

Write the characteristics of the force of friction ?

How is friction harmful to us ? Write some ways by which one can reduce friction.

Describe three different ways by which friction can be increased to help us in various situations?

Vehicles skid on muddy and wet roads. Suggest what type of tyres can prevent skidding of vehicles?

Boats and ships have streamlined shapes?

Brake handles of motorcycles are generally covered with a towelled cloth?

Chapter 3: Force solutions [Page 0]

Solve the crossword puzzle.

Across
3. The force of friction caused due to fluids
4. Type of friction acting between two bodies at rest
5. Type of friction which occurs when applied force overcomes static friction
6. A special body design to enable minimum drage Down
1. Type of force which depends upon the roughness of a surface
2. An effect of friction

Chapter 3: Force

Selina Selina Concise Physics - Middle School Class 6 (2018-19 Session) Selina solutions for Class 6 Physics chapter 3 - Force

Selina solutions for Class 6 Physics chapter 3 (Force) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina Concise Physics - Middle School for Class 6 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 6 Physics chapter 3 Force are Concept of Force - Push Or Pull., Effects of Force on Mass (No Effect), Effects of Force on Speed, Effects of Force on Direction (Rest and Motion), Effects of Force on Change in Shape and Size, Effects of Force on Using Real-world Examples, Concept for Force of Friction, Force of Friction - Advantages and Disadvantages..

Using Selina Class 6 solutions Force exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 6 prefer Selina Textbook Solutions to score more in exam.

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