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Newton's Second Law of Motion

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4.6Newton's Second Law of Motion

Newton's Second Law of Motion Revision Questions

1. Three forces are acting at a 10 kg object as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Newton's Second Law of Motion

What is the magnitude and the direction of acceleration caused by these forces? Take cos 37° = 0.8, sin 37° = 0.6.

  1. 0.5 m/s2 due East
  2. 0.08 m/s2 due South
  3. 0.4 m/s2 due North-East
  4. 0.5 m/s2 due West

Correct Answer: D

2. A 2000 kg car is accelerating at 2 m/s2 when moving along a horizontal road as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Newton's Second Law of Motion

The friction coefficient between the tires and the asphalt is 0.3. If the moving force produced by the engine is 11000 N, what is the magnitude of air resistance? Take g = 10 N/kg.

  1. 1000 N
  2. 4000 N
  3. 5000 N
  4. 7000 N

Correct Answer: A

3. A man is pulling a 120 kg object along a horizontal surface as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Newton's Second Law of Motion

If the object decelerates at 0.2 m/s2, what is the magnitude of the pulling force F? Take g = 10 N/kg. Ignore the air resistance.

  1. 1176 N
  2. 120 N
  3. 96 N
  4. 12 N

Correct Answer: C

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  5. Continuing learning dynamics - read our next physics tutorial: Newton's Third Law of Motion

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