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Quiz Chapter 1: Force and Motion II

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

Question 1 of 10Score: 0

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?

Full Question List & Answer Key

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

1. 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.

2. 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).

3. A block of mass 5 kg rests on a frictionless 30° inclined plane. What magnitude of force applied parallel to the incline is required to keep it stationary? (g = 9.81 m s⁻²)

  1. 42.48 N
  2. 24.53 N
  3. 49.05 N
  4. 9.81 N
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Answer: B

Component of weight pulling down slope = mg sin(30°) = 5 × 9.81 × 0.5 = 24.525 N ≈ 24.53 N. An equal and opposite force maintains equilibrium.

4. What happens when a spring is loaded beyond its elastic limit?

  1. It snaps instantly.
  2. It returns to its original shape faster.
  3. It undergoes permanent plastic deformation and will not return to its original length.
  4. Its spring constant doubles.
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Answer: C

Exceeding the elastic limit leads to plastic deformation where the spring is permanently stretched.

5. A car of mass 1000 kg accelerates at 2.5 m s⁻² along a flat road. If resistive friction forces total 500 N, what driving force is produced by the engine?

  1. 2000 N
  2. 3000 N
  3. 2500 N
  4. 1500 N
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Answer: B

Resultant Force F = ma => F_engine - F_friction = 1000 × 2.5 => F_engine - 500 = 2500 => F_engine = 3000 N.

6. 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.

7. 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.

8. When three coplanar forces act on a stationary object, what condition indicates that the object is in dynamic or static equilibrium?

  1. The forces are all parallel.
  2. The sum of the magnitudes of any two forces equals the third force.
  3. The forces form a closed vector triangle when arranged head-to-tail.
  4. The forces act at 120° relative to each other exclusively.
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Answer: C

If a body is in equilibrium under 3 forces, their vector sum is zero, which forms a closed head-to-tail triangle.

9. 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).

10. Two forces of 6 N and 8 N act at a right angle (90°) to each other on a particle. What is the magnitude of the resultant force?

  1. 14 N
  2. 10 N
  3. 2 N
  4. 48 N
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Answer: B

Using Pythagoras' Theorem: F = √(6² + 8²) = √(36 + 64) = √100 = 10 N.

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