A moving object has (a) speed (b) velocity (c) momentum (d) energy (e) all of th

Question

A moving object has (a) speed (b) velocity (c) momentum (d) energy (e) all of these A large truck collides heand-on with a small compact car. During the collision (a) the truck exerts a greater amount of force on the car than the car exerts on the truck (b) the car exerts a greater amount of force on the truck than the truck exerts on the car (c) the truck exerts a force on the car but the car does not exert a force on the truck (d) the truck exerts the same amount of force on the car as the car exerts on the truck.

Explanation / Answer

Q.1

If an object is moving , that’s mean that it is changing its position with time, hence a moving object has always speed.

                If we observe object at any instant of time, it will have a speed and will be moving into a particular direction. Hence it will also have velocity.

                As every moving object carry momentum (P=mv) , object will also have some finite momentum depending upon its speed and mass.

                As every moving object carry’s kinetic energy , it will also has energy.

Hence all the 4 options are true.(option e is correct)

Q.2

When a large truck collides with a small compact car.

during the collision truck exerts the same amount of force as the car exert on the truck ,

to understand this imagine the situation when both truck and car in contact, they are applying force on each other ,now considering truck and car as a system, there is no external force on them ,and only two internal forces are there(these are resultant forces) .

from Newton’s third law of motion, these forces must be equal and opposite.

Hence option d is correct option.

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