answer the following:
(a) Is it possible that a force changes only in the direction of motion without
(b) Give two examples of contact force.
o Answer the following:
any changes in the speed of an object? Give reasons.
(c) Give two examples of non-contact force.
(d) Is the force of gravity a non-contact force? Give reasons to support your
answer.
(e) A ball rolled on the ground stops after some time. Why? Name the force
responsible for it
Answers
Answer: Here is the answer
Explanation:
A. Centrifugal force changes the direction of the object without changing the speed.
B. Moving a couch across a floor, pushing a car up a hill, kicking a ball or pushing a desk across a room are some of the everyday examples where contact forces are at work.
C. An apple falling down from a tree is one of the best examples of non contact force and Iron pins attracted in the presence of a magnet bar without any physical contact.
D. Non-Contact Forces While the ball is in the air, one force acting on it is gravity. Gravity pulls the ball down to the earth without touching it.
E. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Answer:
answer the following:
(a) Is it possible that a force changes only in the direction of motion without
(b) Give two examples of contact force.
o Answer the following:
any changes in the speed of an object? Give reasons.
(c) Give two examples of non-contact force.
(d) Is the force of gravity a non-contact force? Give reasons to support your
answer.
(e) A ball rolled on the ground stops after some time. Why? Name the force
responsible for it