Question

Muscular force can
A. Change the state of motion of an object
B. Change the shape of an object
C. Both A and B
D. Neither A nor B

Answer 1

Hint: It is a type of force where we use our arms and legs basically muscles of the arm and muscles of the leg. Whenever there is a friction between hand and body, then it leads to change of motion of the body. You can use Newton’s first concept over here.

Complete step-by-step answer:
Take an example of play tug and war. In our childhood we used to play it a lot. So what we did while pulling the rope. We just apply force. When we apply force the muscles of our hand contract and when we release it our muscles relax. And this is nothing but muscular force.
Muscular force is a type of force. It is produced when we use our muscles. So when we apply force and motion of the body it takes place and this leads to contraction of muscles. In this force we use a portion of the body to make the body in motion. This force is produced between the surface where we apply force and the muscles of the arm or legs etc. so muscle force results in a change in motion of the body if it is in a state of rest initially.
If the direction of force applied and motion of the body are the same then the speed of the body increases. If the direction of force applied and motion of the body are opposite then speed of the body decreases.
Answer is (A)

Note: Do not get confused between frictional force and muscular force. Both are different. Frictional force is the force which acts on the whole body by the surface. Muscular force is the force when we apply force that leads to the body moving. Movement of the body is possible only if muscles get contracted. Here, body means not our body but treats it like an object.