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Question (21)

QN003521

A force of 120 N acts on a box while friction of 120 N opposes it. The box:

(A) Accelerates forward
(B) Accelerates backward
(C) Has zero net force
(D) Flies upward

Correct Answer: C

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Question (22)

QN003522

Why are roads made rough?

(A) To decrease friction
(B) To increase friction
(C) To reduce gravity
(D) To reduce pressure

Correct Answer: B

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Question (23)

QN003523

Friction is an example of:

(A) Non-contact force
(B) Contact force
(C) Magnetic force
(D) Electrostatic force

Correct Answer: B

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Question (24)

QN003524

Which type of friction acts on a moving bicycle tyre?

(A) Sliding friction
(B) Rolling friction
(C) Fluid friction
(D) Static friction only

Correct Answer: B

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Question (25)

QN003525

A wooden block requires more force to move on sandpaper than on glass because:

(A) Sandpaper is smoother
(B) Glass increases friction
(C) Sandpaper provides greater friction
(D) Gravity changes

Correct Answer: C

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Question (26)

QN003526

Air resistance is a type of:

(A) Rolling friction
(B) Sliding friction
(C) Fluid friction
(D) Static friction

Correct Answer: C

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Question (27)

QN003527

A force of 45 N acts forward while friction of 18 N acts backward. Net force equals:

(A) 63 N forward
(B) 27 N forward
(C) 27 N backward
(D) 63 N backward

Correct Answer: B

Explanation:

45 − 18 = 27 N forward.

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Question (28)

QN003528

Friction between moving parts of machines can be reduced by:

(A) Painting
(B) Lubrication
(C) Heating
(D) Increasing roughness

Correct Answer: B

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Question (29)

QN003529

Why is it difficult to walk on ice?

(A) Friction is very high
(B) Friction is very low
(C) Gravity disappears
(D) Air resistance increases

Correct Answer: B

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Question (30)

QN003530

Which surface allows a toy car to move farthest?

(A) Sandpaper
(B) Rough road
(C) Polished floor
(D) Gravel

Correct Answer: C

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Question (21)

A force of 120 N acts on a box while friction of 120 N opposes it. The box:

Explanation:

Link:

Question (22)

Why are roads made rough?

Explanation:

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Question (23)

Friction is an example of:

Explanation:

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Question (24)

Which type of friction acts on a moving bicycle tyre?

Explanation:

Link:

Question (25)

A wooden block requires more force to move on sandpaper than on glass because:

Explanation:

Link:

Question (26)

Air resistance is a type of:

Explanation:

Link:

Question (27)

A force of 45 N acts forward while friction of 18 N acts backward. Net force equals:

Explanation:

Link:

Question (28)

Friction between moving parts of machines can be reduced by:

Explanation:

Link:

Question (29)

Why is it difficult to walk on ice?

Explanation:

Link:

Question (30)

Which surface allows a toy car to move farthest?

Explanation:

Link:

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