CIE iGCSE Co-Ordinated Science P1.6.2 Work Exam Style Questions Paper 2
Question
A force of 4.0 N acts on an object for 4.0 s. The object moves a distance of 8.0 m in the direction of the force.
What is the work done by the force?
(A) 1.0 J
(B) 2.0 J
(C) 16 J
(D) 32 J
▶️Answer/Explanation
Ans : D
Question
A box of mass 8.0 kg is lifted vertically from the ground on to a shelf that is 2.0 m above the ground. The gravitational field strength \( g \) is 10 N/kg. How much work is done as the box is lifted on to the shelf?
A. 4.0 J
B. 16 J
C. 40 J
D. 160 J
▶️Answer/Explanation
Answer: D
Explanation: Work done is calculated using the formula: \[ W = m \times g \times h = 8.0 \, \text{kg} \times 10 \, \text{N/kg} \times 2.0 \, \text{m} = 160 \, \text{J} \] Therefore, the work done is 160 J.
Question
The diagram shows a box of weight 600 N being pulled up a frictionless slope by a force.
How much work is done against gravity in moving the box from X to Y?
A 600 J
B 1800 J
C 24000 J
D 30000 J
▶️Answer/Explanation
Answer: B
Explanation: Work done against gravity = weight × vertical height W = mgh = 600N × 3m = 1800J The horizontal distance (4m) and slope length (5m) are irrelevant for work against gravity. Only the vertical displacement (3m) matters when calculating work done against gravity.
Question
An engine is doing work on a car as the car moves along a road.
Which two changes must result in less work being done on the car by the engine?
A. decreasing the engine’s force on the car and decreasing the distance moved by the car
B. decreasing the engine’s force on the car and increasing the distance moved by the car
C. increasing the engine’s force on the car and decreasing the distance moved by the car
D. increasing the engine’s force on the car and increasing the distance moved by the car
▶️Answer/Explanation
Answer: A
Explanation: Work done = force × distance (W = Fd). To decrease work done, you need to decrease either the force or the distance or both. Option A describes decreasing both factors, which would definitely result in less work being done.