Force and Laws of Motion

Q. A 1 kg object is moving with a velocity of 10 m/s. What is its momentum?

A. 5 kg·m/s
B. 10 kg·m/s
C. 15 kg·m/s
D. 20 kg·m/s

Solution

Momentum = mass × velocity = 1 kg × 10 m/s = 10 kg·m/s.

Correct Answer: B — 10 kg·m/s

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Q. A 2 kg block is at rest on a horizontal surface. What is the normal force acting on it?

A. 0 N
B. 2 N
C. 20 N
D. 200 N

Solution

Normal force = weight of the block = mass × g = 2 kg × 10 m/s² = 20 N.

Correct Answer: C — 20 N

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Q. A 4 kg object is dropped from a height. What is its velocity just before it hits the ground (neglect air resistance) if it falls for 3 seconds?

A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s

Solution

Velocity = g × t = 10 m/s² × 3 s = 30 m/s.

Correct Answer: B — 20 m/s

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Q. A 5 kg object is subjected to a net force of 15 N. What is its acceleration?

A. 2 m/s²
B. 3 m/s²
C. 4 m/s²
D. 5 m/s²

Solution

Using F = ma, acceleration a = F/m = 15 N / 5 kg = 3 m/s².

Correct Answer: B — 3 m/s²

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Q. A force of 10 N is applied to an object of mass 2 kg. What is the acceleration of the object?

A. 2 m/s²
B. 5 m/s²
C. 10 m/s²
D. 20 m/s²

Solution

Using Newton's second law, F = ma, we have a = F/m = 10 N / 2 kg = 5 m/s².

Correct Answer: B — 5 m/s²

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Q. An object is moving in a circular path of radius 10 m with a constant speed of 5 m/s. What is the centripetal acceleration?

A. 0.5 m/s²
B. 2.5 m/s²
C. 5 m/s²
D. 25 m/s²

Solution

Centripetal acceleration = v²/r = (5 m/s)² / 10 m = 2.5 m/s².

Correct Answer: B — 2.5 m/s²

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Q. If a 3 kg object is pushed with a force of 12 N, what is the net force acting on it if there is a frictional force of 3 N?

A. 3 N
B. 9 N
C. 12 N
D. 15 N

Solution

Net force = applied force - frictional force = 12 N - 3 N = 9 N.

Correct Answer: B — 9 N

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Q. If a car accelerates from rest to a speed of 20 m/s in 5 seconds, what is the average acceleration?

A. 2 m/s²
B. 4 m/s²
C. 5 m/s²
D. 10 m/s²

Solution

Average acceleration = (final velocity - initial velocity) / time = (20 m/s - 0) / 5 s = 4 m/s².

Correct Answer: B — 4 m/s²

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Q. If a force of 50 N is applied to a 10 kg object, what is the object's acceleration?

A. 2 m/s²
B. 5 m/s²
C. 10 m/s²
D. 15 m/s²

Solution

Acceleration = F/m = 50 N / 10 kg = 5 m/s².

Correct Answer: B — 5 m/s²

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Q. What is the weight of a 10 kg object on Earth (g = 9.8 m/s²)?

A. 9.8 N
B. 19.6 N
C. 29.4 N
D. 39.2 N

Solution

Weight = mass × gravity = 10 kg × 9.8 m/s² = 98 N.

Correct Answer: B — 19.6 N

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Force and Laws of Motion

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