CIE iGCSE Co-Ordinated Science P1.6.2 Work Exam Style Questions Paper 2
▶️ Answer/Explanation
Work is measured in joules (J). One joule is the work done when a force of 1 newton moves an object 1 metre, so the equivalent combination is newton metre (N m). Option A is correct.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Power is the rate of energy transfer, given by \(P = \frac{E}{t}\). Rearranging for time: \(t = \frac{E}{P}\). Substituting the values: \(t = \frac{30}{60} = 0.50 \, \text{s}\). The lamp is switched on for 0.50 seconds.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Work done is calculated as \( W = F \times d \), using only the force and the distance moved in the direction of the force.
\( W = 4.0 \text{ N} \times 8.0 \text{ m} = 32 \text{ J} \).
The time of 4.0 s given in the question is not needed for this calculation.
✅ Answer: (D)
\( W = 4.0 \text{ N} \times 8.0 \text{ m} = 32 \text{ J} \).
The time of 4.0 s given in the question is not needed for this calculation.
✅ Answer: (D)
▶️ Answer/Explanation
The work done lifting the lift is calculated using \(W = Fd = 4000 \times 12 = 48000\ \text{J}\).
Power is the rate of doing work, so \(P = \frac{W}{t}\), which rearranges to \(t = \frac{W}{P}\).
Substituting values gives \(t = \frac{48000}{800} = 60\ \text{s}\).
✅ Answer: (D)
Power is the rate of doing work, so \(P = \frac{W}{t}\), which rearranges to \(t = \frac{W}{P}\).
Substituting values gives \(t = \frac{48000}{800} = 60\ \text{s}\).
✅ Answer: (D)
▶️ Answer/Explanation
Kinetic energy is the energy an object possesses due to its motion. The correct formula is \(E_k = \frac{1}{2}mv^2\). This shows that kinetic energy is directly proportional to mass and to the square of the speed. Option A is missing the square, and options C and D incorrectly square the product.
✅ Answer: (B)
✅ Answer: (B)