WorksheetsCHAPTER 7 ENERGY AND POWER
Total questions: 10
Worksheet time: 5mins
What is the definition of work in physics?
Force applied on an object
Displacement of an object due to a force
Product of force and distance moved in the direction of force
Energy required to move an object
Which of the following is an example of work being done?
Holding a book in a fixed position
Pushing a wall without movement
Lifting a box onto a table
Sitting on a chair
A boy pushes a 10 kg box with a force of 50 N for 4 m. How much work is done?
50 J
100 J
200 J
400 J
Which statement about power is true?
Power is the rate at which work is done
Power is measured in joules
Power is energy stored in an object
Power is independent of time
A motor does 500 J of work in 5 seconds. What is its power output?
50 W
100 W
250 W
500 W
The principle of conservation of energy states that:
Energy can be created
Energy is always lost
Energy cannot be created or destroyed, only transformed
Energy is always increasing
Which of the following factors affects gravitational potential energy?
Mass and height
Speed and height
Mass and speed
Force and displacement
What happens to kinetic energy if the velocity of an object doubles?
It remains the same
It doubles
It quadruples
It reduces to half
A stretched rubber band has what kind of energy?
Kinetic energy
Gravitational potential energy
Elastic potential energy
Heat energy
A pendulum swings back and forth. At which point is its kinetic energy the highest?
At the top of the swing
At the lowest point of the swing
Halfway to the top
At any random point
