THE FORMULA OF FORCE IS F=ma, BUT WHAT WILL BE THE FORCE APPLIED IF AN OBJECT IS MOVING, BUT ACCELERATION IS NOT THERE i.e THE OBJECT MOVES WITH UNIFORM SPEED OR VELOCITY.

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An object of mass 16 kg moving with an acceleration of 3 metre second square. Calculate the applied force if the same force is applied on an object of mass 24 kg how much will be the acceleration?

Q. Assertion :There will be no action of external force on an object moving with uniform velocity. Reason: The force acting on an object need not cause motion. It may deform the dimension of it.

Q. Assertion :Statement 1: There will be no net external force on an object moving with uniform velocity. Reason: Statement 2: The force acting on an object need not cause motion. It may deform the dimensions of object.

Solve the following examples:

(1) An object of mass 16 kg moves with an acceleration of 3 m/s². Calculate the force acting on it. If the same force is applied to another object of mass 24 kg, what will be the acceleration?

[Ans : 48 N, 2 m/s²]

(2) A bullet of mass 10 g moving with velocity of 1.5 m/s hits a thick wooden plank of mass 90 g. The plank is initially at rest, but when it gets hit by the bullet, the bullet remains in the plank and both move with a certain speed. Calculate the speed with which plank containing the bullet moves?

[Ans : 0.15 m/s]

Q. State which of the following situations are possible and give an example for each of these:
(a) an object with a constant acceleration but with zero velocity.
(b) an object moving with an acceleration but with uniform speed.

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