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Question (41)

QN003541

A force of 200 N acts on a crate while friction of 160 N opposes it. Resultant force is:

(A) 360 N forward
(B) 40 N forward
(C) 40 N backward
(D) 360 N backward

Correct Answer: B

Explanation:

200 − 160 = 40 N forward.

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Question (42)

QN003542

Oiling bicycle chains helps because it:

(A) Increases friction
(B) Reduces friction
(C) Increases weight
(D) Stops motion

Correct Answer: B

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Question (43)

QN003543

Which type of friction acts before a body starts moving?

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

Correct Answer: C

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Question (44)

QN003544

Why do athletes wear shoes with spikes?

(A) To reduce friction
(B) To increase friction
(C) To reduce mass
(D) To reduce pressure

Correct Answer: B

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Question (45)

QN003545

A force of 95 N acts eastward while friction of 25 N acts westward. Net force is:

(A) 120 N eastward
(B) 70 N eastward
(C) 70 N westward
(D) 120 N westward

Correct Answer: B

Explanation:

95 − 25 = 70 N eastward.

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Question (46)

QN003546

Friction converts mechanical energy mainly into:

(A) Sound only
(B) Heat energy
(C) Light energy
(D) Chemical energy

Correct Answer: B

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Question (47)

QN003547

Which surface gives minimum friction for sliding?

(A) Rough wood
(B) Sandpaper
(C) Ice surface
(D) Gravel

Correct Answer: C

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Question (48)

QN003548

Why are wheels useful in transport?

(A) They increase sliding friction
(B) They reduce friction by rolling
(C) They increase weight
(D) They reduce gravity

Correct Answer: B

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Question (49)

QN003549

A force of 68 N acts forward while friction of 28 N acts backward. Resultant force equals:

(A) 96 N forward
(B) 40 N forward
(C) 40 N backward
(D) 96 N backward

Correct Answer: B

Explanation:

68 − 28 = 40 N forward.

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Question (50)

QN003550

Friction between surfaces can be increased by:

(A) Polishing surfaces
(B) Applying oil
(C) Making surfaces rough
(D) Using ball bearings

Correct Answer: C

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Question (41)

A force of 200 N acts on a crate while friction of 160 N opposes it. Resultant force is:

Explanation:

Link:

Question (42)

Oiling bicycle chains helps because it:

Explanation:

Link:

Question (43)

Which type of friction acts before a body starts moving?

Explanation:

Link:

Question (44)

Why do athletes wear shoes with spikes?

Explanation:

Link:

Question (45)

A force of 95 N acts eastward while friction of 25 N acts westward. Net force is:

Explanation:

Link:

Question (46)

Friction converts mechanical energy mainly into:

Explanation:

Link:

Question (47)

Which surface gives minimum friction for sliding?

Explanation:

Link:

Question (48)

Why are wheels useful in transport?

Explanation:

Link:

Question (49)

A force of 68 N acts forward while friction of 28 N acts backward. Resultant force equals:

Explanation:

Link:

Question (50)

Friction between surfaces can be increased by:

Explanation:

Link:

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