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प्रश्न
Answer the following in detail.
What are the various effects of force? State one example of each.
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उत्तर
Various effects of force :
- A force can move a stationary object.
Example: Pulling a suitcase on its wheels. - A force can stop a moving object.
Example: A ball rolling on the rough surface comes to rest after some time due to the force of friction. - A force can change the speed of a moving object.
Example: We can increase the speed of a moving swing, we apply a force (push) in the direction of motion to increase its speed. - A force can change the direction of a moving object.
Example: A moving bicycle changes its direction when a force is applied to steer its handle. - A force can change the shape and size of an object.
Example: When we make a chapatti, a small ball of dough is changed to a flat, circular shape of a much bigger size by applying a force with the help of a rolling pin.
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संबंधित प्रश्न
Select the correct alternative.
Friction is reduced by
When you apply brakes, the bicycle stops and the rim of the wheel becomes hot? Explain the reason.
Give three examples to illustrate that friction is a necessary evil.
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.
Fill in the blank.
Sliding friction and rolling friction are types of .................. friction.
Tick the most appropriate answer
Friction always
Tick the most appropriate answer.
Friction produces
State if the following statement is true or false. Correct the statement if it is false.
Friction helps us to grip the objects in our hand.
Answer the following in a word or two or in a sentence.
Name a method used to reduce friction.
Answer the following in short.
Define rolling friction and give an example where rolling. friction comes into play.
