BECE Force, Work, and Energy 2

Question 1

A block is pushed across a floor with a force of 20 N over a distance of 5 m. How much work is done on the block?

Accepted Answer

100 J

Answer

Work = Force × distance = 20 N × 5 m = 100 J.

Question 2

Which of the following is a non-contact force?

Accepted Answer

Gravitational force

Answer

Gravitational force acts between objects without physical contact, making it a non-contact force.

Question 3

A 5 kg object is lifted 3 m vertically. If g = 10 m/s², what is the gravitational potential energy gained?

Accepted Answer

150 J

Answer

GPE = mgh = 5 × 10 × 3 = 150 J.

Question 4

Which unit is used to measure work?

Accepted Answer

Joule

Answer

Work is measured in Joules (J), which equals Newton-metres (N·m).

Question 5

A 2 kg ball moving at 4 m/s comes to rest after hitting a wall. How much kinetic energy did it lose?

Accepted Answer

16 J

Answer

KE lost = ½mv² = ½ × 2 × 4² = ½ × 2 × 16 = 16 J.

(BECE) Basic Education Certificate Examination Practice Test