Newton’s first law of motion is valid only in the absence of:

Inertia depends upon

A boy jumps out of a moving bus. There is a danger for him to fall:

A string is stretched by two equal and opposite forces 10 N each. The tension in the string is

The mass of a body:

Two bodies of masses m₁ and m₂ attached to the ends of an inextensible string passing over a frictionless pulling such that both move vertically. The acceleration of the bodies is:

Which of the following is the unit of momentum?

When horse pulls a cart, the action is on the:

Which of the following material lowers friction when pushed between metal plates?