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Friction

Description: Friction - I
Number of Questions: 20
Created by:
Tags: Friction - I Effect of Friction Direction of Friction Friction and its Nature How Smoothness Between Surfaces Affects Friction Difference Between Static and Sliding Friction Factors Affecting Friction Role of Friction in Motion Decreasing Friction by Using Lubricants How to Decrease Friction Wearing Effects of Friction
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Which of the following options is not a lubricant?

  1. Oil

  2. Grease

  3. Graphite

  4. Black Polish

Show answer
Correct Option: D
Explanation:

Black Polish is not a lubricant.

Why is the sole of shoe groomed?

  1. To increase friction

  2. To decrease friction

  3. To reduce friction

  4. To increase pressure

Show answer
Correct Option: A

Which of the following activities requires force of friction?

  1. Rolling

  2. Writing

  3. Walking

  4. All of the above

Show answer
Correct Option: D

Which of the following frictions applies least resistance to the motion of the body?

  1. Rolling friction

  2. Sliding friction

  3. Static friction

  4. None of these

Show answer
Correct Option: A

How can friction be reduced to zero?

  1. By using oil

  2. By using polishing

  3. By using grease

  4. Never possible

Show answer
Correct Option: D

What is the use of ball bearings between hubs and the axle of ceiling fans and bicycle?

  1. To reduce sliding friction

  2. To reduce static friction

  3. Rolling reduces friction

  4. Rolling increases friction

Show answer
Correct Option: C

Drag is a frictional force exerted by _____.

  1. gases

  2. solids

  3. liquids

  4. both gases and liquids

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Correct Option: D

Which of the following types of shapes is given to the objects to minimize drag?

  1. Triangular

  2. Spherical

  3. Streamlined

  4. Rectangular

Show answer
Correct Option: C

Why is the shape of birds streamlined?

  1. To minimize force of friction

  2. To increase force of friction

  3. To overcome gravitational force

  4. To protect themselves from the ill effects of sunlight

Show answer
Correct Option: A

Air exerts frictional force on an object moving through it because air ____.

  1. moves in the direction of the body

  2. opposes motion of the body

  3. air increases the speed of body and its speed exerts frictional force

  4. air is very light and thin, so, it exerts frictional force

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Correct Option: B

Why does an object moving over the surface of another object slow down?

  1. Due to friction

  2. Due to internal force

  3. Due to pressure

  4. Due to gravity

Show answer
Correct Option: A
Explanation:

 Due to friction an object moving over the surface of another object slows down.

When does force of friction come into play?

  1. When a body stops its movement

  2. When a body does not start its movement

  3. After sliding through some distance

  4. When a body slides or tends to do it on the surface of other body

Show answer
Correct Option: D
Explanation:

 When a body slides on the surface of other body.

What happens when one object moves over the surface of another object?

  1. Surface of only upper object exerts force of friction on lower object.

  2. Surface of lower object exerts force of friction on upper object.

  3. Surface of both the objects exerts force on each other.

  4. Surface of both the objects exerts force in a direction opposite to each other.

Show answer
Correct Option: D

Tie a string of spring balance around brick. Pull it with spring balance and note down the reading when brick just begins to move. Now repeat by placing the brick in polythene and then by placing the brick wrapped in a newspaper. In which of the following cases do we get small value of force of friction?

  1. When we pull brick

  2. When we pull brick wrapped in newspaper

  3. When we pull brick wrapped in polythene

  4. Same value in all cases

Show answer
Correct Option: C
Explanation:

 When we pull brick wrapped in polythene because it reduces force of friction.

What is the main cause of friction?

  1. Irregularities and interlocking of the two surfaces in contact.

  2. Heat is produced when two surfaces rub each other.

  3. When two surfaces come in contact, they exert pressure on each other which causes friction.

  4. Irregularities on the upper surface only cause friction when two surfaces comes in contact.

Show answer
Correct Option: A

Nikhil was performing an activity. He first held the ball after wearing gloves, then he held it with oily hands and then with greasy hands and then washed his hands properly and held the ball. Why is it difficult to hold ball with greasy hands?

  1. Very less force friction is present between the ball and greasy hands.

  2. Proper force on ball is not exerted by the hands due to grease.

  3. Large frictional force is present between the ball and greasy hands.

  4. Ball slips from hands.

Show answer
Correct Option: A
Explanation:

 Very less force friction is present between the ball and greasy hands.

Make an inclined plane on a smooth floor. Now put a mark with pen at any point A on the inclined plane. Let the pencil cell moves down from this point and note down distance. Now spread a piece of woollen cloth on the floor and repeat the experiment and note down distance. Now repeat this activity by spreading sand paper over it. In which of the following cases does pencil cell cover maximum distance?

  1. In all cases, distance covered would be same.

  2. When woollen cloth is spread over the floor.

  3. When sand paper is spread on the floor.

  4. When nothing is spread on the floor.

Show answer
Correct Option: D
Explanation:

 When nothing is spread on the floor the force of friction of minimum.

How is static friction different from sliding friction?

  1. When we try to move a surface, sliding friction comes. Static friction comes into play when objects are moving over each other.

  2. Sliding friction comes into play when object stops moving and static friction comes into play when we try to move the object.

  3. Sliding friction comes into play when object slides over another object. On the other hand, static friction comes into play when we try to move the object.

  4. Sliding friction is larger than static friction.

Show answer
Correct Option: C
Explanation:

Sliding friction comes into play when object slides over another object. On the other hand, static friction comes into play when we try to move the object which is at rest.

Which of the following statements is false about friction?

  1. Friction is a necessary evil.

  2. It is responsible for starting or stopping motion.

  3. It is a conservative force.

  4. It decreases the efficiency of machines.

Show answer
Correct Option: C
Explanation:

 It is not  a conservative force.

How is frictional force helpful in walking?

  1. Frictional force is exerted on the ground by foot.

  2. It produces heat which helps in walking.

  3. If there was no friction, your foot would simply slide back as you tried to take steps, and you would go nowhere.

  4. It prevents the foot from slipping forward.

Show answer
Correct Option: C
Explanation:

 If there was no friction, your foot would simply slide back as you tried to take steps, and you would go nowhere.

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