Question

Which of the following is /are true about force:i. unbalanced force can change the shape of the body. ii. Balanced forces can change the state of rest or of motion of an object. iii. Balanced forces do not produce any acceleration, iv. To accelerate the motion of an object, a balanced force is required​

Answer 1

Answer:

A and B is the correct answer for this

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Answer 2

The following are true about the force;

iii. Balanced forces do not produce any acceleration.

Balanced forces have resultant force zero, hence they cannot change the state of rest or motion of an object because of inertia. This is stated by Newton's first law of motion.

i. unbalanced force can change the shape of the body. (False)

Unbalanced force is said to be applied on a body when the net force on the body is not equal to zero.

To change the shape of the body, a balanced force is required, an unbalanced force will result in a change in the state of rest or motion or acceleration of the body.

ii. Balanced forces can change the state of rest or of motion of an object. (False)

To change the state of rest or motion, unbalanced forces are required.

iv. To accelerate the motion of an object, a balanced force is required​ (False)

To produce an acceleration, a change in velocity is required. And to change the velocity, an unbalanced force is needed. Therefore balanced forces cannot produce an acceleration in an object.