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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
Friction depends on the ______ of surfaces.
Write true or false.
The sliding friction is more than the rolling 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.
Fill in the blank.
.................... is the SI unit of force.
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.
Answer the following in a word or two or in a sentence.
Why does a rolling ball stop after moving some distance?
Fill in the blank.
The force of friction acting between two bodies in contact while at rest is known as ................ friction.
State if the following statement is true or false. Correct the statement if it is false.
Friction has no relation with our walking or running.
Complete the analogy.
Knot in a thread : _____ friction : : Ball bearing : _____ friction
Assertion: We can live very happily if friction is not present in nature.
Reason: The airplane shape is streamlined to reduce the effort of frictional force.
