Frictional Force Questions

The force generated by two surfaces that contact and slide against each other are called frictional force. The angle and position of the object affect the volume of frictional force. Fluid friction is the friction that takes place between gases and fluids. Both static and kinetic friction is proportional to the normal force exerted between the solid bodies. When two fabrics slide over each other generates static friction. A basketball rolling on the court comes to rest after some time. Opening and sliding door/window is an example of sliding friction. A swimmer experiences an opposing force while swimming known as fluid friction force. Types of friction are:

1. Dry Friction

a. Static Friction

b. Kinetic Friction

c. Rolling Friction

d. Sliding Friction

2. Fluid Friction

The frictional force is given by the formula: F = μN

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Important Frictional Force Questions with Answers

1. Which friction explains the reaction between kinetic friction and static friction?
2. Dry Friction
3. Static Friction
4. Fluid Friction
5. Rolling Friction

Answer: a) Dry Friction

Explanation: Dry friction resists the sliding movement of moving solid on non-moving solid.

2. Friction is affected by _____.

1. Wind
2. The angle of the object
3. Position of the object
4. Options b and c

Answer: d) Options b and c

Explanation: The angle of the object and position of the object affects the amount of frictional force.

3. Formula to find the frictional force is _____.

1. F = μ+N
2. F = μ-N
3. F = μN
4. F = μ/N

Answer: c) F = μN

Explanation: Frictional force is given by the formula F = μN

4. The fluid friction in which the lubricant fluid separates two solid surfaces is known as _____.

1. Skin friction
2. Dry Friction
3. Static Friction
4. Lubricated friction

Answer: d) Lubricated friction.

Explanation: Lubrication helps to reduce the wear and tear of the surfaces. The fluid friction in which a fluid separates two solid surfaces is called lubricated friction.

5. This internal resistance offered to the flow of liquid is known as _____.

1. Thinning
2. Freezing
3. Viscosity
4. Tightness

Answer: c) Viscosity

Explanation: internal resistance offered to the flow of liquid is called viscosity.

6. Water is less viscous than honey.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: Honey is more viscous than water.

7. Friction developed due to the interaction between the fluid and the skin of the body is known as ______.

1. Dry Friction
2. Skin friction
3. Static Friction
4. Lubricated friction

Answer: b) Skin friction

Explanation: Skin friction arises due to the interaction between the fluid and the body’s skin.

8. Coefficient of friction is given by the formula _____.

1. μ = F+L
2. μ = F-L
3. μ = FL
4. μ = F/L

Answer: d) μ = F/L

Explanation: μ = F/L is the formula to find the coefficient of friction.

9. The friction is inversely proportional to the weight that presses the surfaces together.

1. TRUE
2. FALSE

Answer: b) FALSE

Explanation: The friction is directly proportional to the load that presses the surfaces together.

10. Is friction a conservative or nonconservative force?

Friction is a nonconservative force since the quantity of work done by friction depends on the path.

Practice Questions

1. Define the coefficient of friction.
2. What is meant by the frictional force?
3. Give daily life examples where frictional force is used.
4. What is rolling friction?
5. Give an example of sliding friction.

Watch the video below to understand types of friction.