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A body needs a force F1 just to start moving on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is
- the static friction
- sliding friction and
- rolling friction? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Concept: undefined >> undefined
Answer the following.
What do you understand by a force?
Concept: undefined >> undefined
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Fill in the blank.
.................... is the SI unit of force.
Concept: undefined >> undefined
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
Concept: undefined >> undefined
State if the following statement is true or false. Correct the statement if it is false.
Like charges always attract each other.
Concept: undefined >> undefined
Answer the following in a word or two or in a sentence.
Which type of force acts on a string pulled from both ends?
Concept: undefined >> undefined
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Concept: undefined >> undefined
Answer the following in short.
Define force. Write its SI unit.
Concept: undefined >> undefined
Answer the following in short.
What do you understand by normal force?
Concept: undefined >> undefined
Answer the following in detail.
What are the various effects of force? State one example of each.
Concept: undefined >> undefined
Fill in the blank.
More the roughness of a surface, greater is the ........................
Concept: undefined >> undefined
Fill in the blank.
Rolling friction offers ............. resistance than sliding friction.
Concept: undefined >> undefined
Fill in the blank.
Weight remaining the same, friction is independent of ............. of surface in contact.
Concept: undefined >> undefined
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
Concept: undefined >> undefined
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
Concept: undefined >> undefined
Tick the most appropriate answer.
Force of friction comes into play when a/an
Concept: undefined >> undefined
Tick the most appropriate answer
Friction always
Concept: undefined >> undefined
Tick the most appropriate answer.
Friction is offered by
Concept: undefined >> undefined
Tick the most appropriate answer.
A car skids on a wet or muddy road due to
Concept: undefined >> undefined
Tick the most appropriate answer.
Friction for an object can be reduced by
Concept: undefined >> undefined
