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Quiz Chapter 1: Force and Motion II

10 questions · Form 5 Physics Bab 1: Force and Motion II

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. An object resting on a smooth inclined plane at an angle θ to the horizontal accelerates down the slope. What is its acceleration?

  1. g cos θ
  2. g sin θ
  3. g / sin θ
  4. g tan θ
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Answer: B

The component of force parallel to the incline is F = mg sin θ. Using Newton's 2nd Law F = ma => ma = mg sin θ => a = g sin θ.

2. A force of 50 N is applied to pull a box at an angle of 30° to the horizontal ground. What is the horizontal component of this force?

  1. 25.0 N
  2. 50.0 N
  3. 43.3 N
  4. 30.0 N
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Answer: C

Horizontal component Fx = F cos(θ) = 50 × cos(30°) = 50 × 0.866 = 43.3 N.

3. Two identical springs with spring constant k are connected in series. How does the extension of the series system compare to a single spring under the same load F?

  1. It is half the extension of a single spring.
  2. It is double the extension of a single spring.
  3. It is four times the extension of a single spring.
  4. It remains the same.
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Answer: B

In series, each spring experiences full load F and extends by x. Total extension xtotal = x + x = 2x (double).

4. Two identical springs, each with a spring constant k = 200 N m⁻¹, are connected in parallel. What is the effective spring constant of the combined system?

  1. 100 N m⁻¹
  2. 400 N m⁻¹
  3. 200 N m⁻¹
  4. 50 N m⁻¹
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Answer: B

For parallel arrangements, keff = k1 + k2 = 200 + 200 = 400 N m⁻¹.

5. A stationary lamp of mass 2 kg is suspended by two light cables. What is the vector sum of all forces acting on the lamp?

  1. 19.62 N downwards
  2. 0 N
  3. 39.24 N upwards
  4. 9.81 N horizontally
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Answer: B

The lamp is stationary (in equilibrium), so the resultant force (vector sum of all forces) is 0 N.

6. A force of 20 N stretches a spring by 4 cm. Calculate the elastic potential energy stored in the spring.

  1. 0.4 J
  2. 40 J
  3. 0.8 J
  4. 80 J
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Answer: A

Ep = 12 × F × x = 12 × 20 N × 0.04 m = 0.4 J.

7. What is represented by the gradient of a Force against Extension (F vs x) graph for a spring?

  1. Elastic Potential Energy
  2. Work Done
  3. Spring Constant (k)
  4. Acceleration due to gravity
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Answer: C

From F = kx, gradient ΔF/Δx = k (the spring constant).

8. According to Hooke's Law, what is the relationship between the stretching force F and the spring extension x?

  1. F is inversely proportional to x
  2. F is directly proportional to x²
  3. F is directly proportional to x within the elastic limit
  4. F is independent of x
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Answer: C

Hooke's Law states that F = kx; the extension x is directly proportional to the applied force F provided the elastic limit is not exceeded.

9. Four identical springs with constant k are configured as two parallel pairs, and these two pairs are connected in series. What is the effective spring constant of the combined system?

  1. k2
  2. 4k
  3. k
  4. 2k
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Answer: C

Each parallel pair has keff1 = 2k. Connecting two 2k systems in series gives 1/ktotal = 12k + 12k = 22k = 1k => ktotal = k.

10. A picture frame of weight 12 N hangs vertically from a smooth nail using a string. The two segments of string make an angle of 60° with each other. What is the tension T in each segment of the string?

  1. 12.0 N
  2. 6.93 N
  3. 6.0 N
  4. 13.86 N
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Answer: B

Vertical components support weight: 2T cos(30°) = 12 => 2T(0.866) = 12 => 1.732 T = 12 => T = 6.93 N.

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