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Types of Forces II. Resistive Forces (Frictional Force. Drag). Terminal Velocity

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4.3Types of Forces II. Resistive Forces (Frictional Force. Drag). Terminal Velocity

Types of Forces II. Resistive Forces (Frictional Force. Drag). Terminal Velocity Revision Questions

1. An object starts moving when a 30N horizontal force pulls it, as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Types of Forces II. Resistive Forces (Frictional Force. Drag). Terminal Velocity

If the friction coefficient between the surfaces in contact is 0.47, what is the mass of the object rounded at 1 decimal place?

  1. 14.1 kg
  2. 4.6 kg
  3. 6.5 kg
  4. 63.8 kg

Correct Answer: C

2. A 3 kg object rests on a 30° slope as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Types of Forces II. Resistive Forces (Frictional Force. Drag). Terminal Velocity

If the minimum downhill force necessary to make it slide (including the component of gravitational force in the direction of motion) is 12N, what is the value of friction coefficient of the slope? Take cos 30° = 0.866 and sin 30° = 0.500. Also take g = 9.81 m/s2.

  1. 0.47
  2. 0.50
  3. 0.87
  4. 0.41

Correct Answer: A

3. A 6 kg object rest on a horizontal table, as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Types of Forces II. Resistive Forces (Frictional Force. Drag). Terminal Velocity

When a 15 N extra force acting downwards is applied on the upper face of the object, the minimum horizontal force to make it move is 20 N. What is the friction coefficient between the object and the horizontal plane?

  1. 0.27
  2. 0.34
  3. 0.25
  4. 0.47

Correct Answer: A

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