Q3 of 13 Page 128

Answer the following

A bus and a car are moving at the same speed. Which of the two has a greater kinetic energy?

Kinetic energy of any object depends upon two factors (a) mass (b) speed


Now as the bus and the car are moving at the same speed, so the kinetic energy of the vehicle having greater mass will be greater. And we know that the mass of the bus is always greater than the mass of the car so the kinetic energy of the bus is greater than the kinetic energy of the car.


More from this chapter

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3

Answer the following

State whether the energy possessed in the following is kinetic or potential;


Compressed spring, stretched bow, moving arrow, water stored in a dam, a stone at the top of a building, bird resting on the branch of a tree.

 3

Answer the following

Distinguish between potential energy and kinetic energy of a body.

 3

Answer the following

A ball of mass 200g falls from a height of 5m. What is its kinetic energy when it just reaches the ground?(g = 9.8 ms-2)

 3

Answer the following

There are a number of devices in common use that change energy from one form to another. Name some devices that change


1. electrical energy into light energy


2. electrical energy into mechanical energy


3. electrical energy into heat


4. sound energy into electrical energy


5. chemical energy into electrical energy.