Question

Q.3. Short question answers - (any 2)
(4 Mar
1) How force can change state of motion and change the shape of the body?
2) What are contact and non-contact force?
3) What is meant by rolling friction?​

Answer 1

Answer:

1)If the force applied on the object is in the direction of its motion, the speed of the object increases. If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object. ... Thus, a force may bring a change in the state of motion of an object.

2)A non-contact force is a force which acts on an object without coming physically in contact with it. ... In contrast a contact force is a force applied to a body by another body that is in contact with it.

Answer 2

Answer:

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Explanation:ok

1. If the force applied on the object is in the direction of its motion, the speed of the object increases. If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object. ... Thus, a force may bring a change in the state of motion of an object.
2. A non-contact force is a force which acts on an object without coming physically in contact with it. ... In contrast a contact force is a force applied to a body by another body that is in contact with it.
3. Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. ... In analogy with sliding friction, rolling resistance is often expressed as a coefficient times the normal force.