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प्रश्न
Answer the following in detail.
What are the various effects of force? State one example of each.
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
Give examples to show that friction is both a friend and a foe.
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
Define static friction
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.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Tick the most appropriate answer.
Friction is offered by
Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
Answer the following in short.
How can sliding friction be changed into rolling friction easily?
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play
Friction depends on the ______ of two surfaces in contact.
