Form 3 Science Chapter 7: Energy and Power

Front

What will increase the work done? Options: Decreased power, Decreased gravity, Increased distance, Decreased friction.

Back

Increased distance

Front

A wood with the mass of 2 kg is dropped from a height of 6 m. What is the kinetic energy of the wood when it reaches the ground?

Back

120 J

Front

A rock with a mass of 2kg fell from a building of 20 metre height. What is the speed of the rock before the rock hits the ground?

Back

Front

The S.I. unit of power is ( ).

Back

Watt, watt

Front

The S.I. unit of work is ( ).

Back

Joule, joule

Front

Work = Force x ( )

Back

Displacement

Front

A wooden block is pulled horizontally with 2 N over 0.5 m. Calculate the work done.

Back

1 J

Front

Calculate the work done when a 15 kg box is lifted vertically by 4m using a pulley. (1 kg = 10 N)

Back

600 J

Front

A pulley is used to lift a table weighing 1000 N to a height of 2.5m in 50 seconds. Calculate the power of the pulley.

Back

50 W

Front

Which of the following stores elastic potential energy?

• A compressed spring
• A fruit on a tree
• A bird nest on a tree
• Water in a dam

Back

A compressed spring