Q. According to Newton's third law, if you push against a wall, what does the wall do?
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A.
Pushes back with equal force
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B.
Does nothing
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C.
Falls down
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D.
Absorbs the force
Solution
Newton's third law states that for every action, there is an equal and opposite reaction.
Correct Answer:
A
— Pushes back with equal force
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Q. According to Newton's third law, if you push against a wall, what happens?
-
A.
The wall pushes back with equal force
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B.
The wall does not respond
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C.
You move backward
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D.
The wall collapses
Solution
Newton's third law states that for every action, there is an equal and opposite reaction.
Correct Answer:
A
— The wall pushes back with equal force
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Q. If a 15 kg object is dropped from a height of 20 m, what is its potential energy just before it hits the ground?
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A.
300 J
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B.
1500 J
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C.
600 J
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D.
1200 J
Solution
Potential energy PE = mgh = 15 kg * 9.81 m/s² * 20 m = 2943 J.
Correct Answer:
B
— 1500 J
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Q. If an object is in free fall, what is its acceleration due to gravity?
-
A.
9.8 m/s²
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B.
10 m/s²
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C.
8.5 m/s²
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D.
12 m/s²
Solution
The acceleration due to gravity near the Earth's surface is approximately 9.8 m/s².
Correct Answer:
A
— 9.8 m/s²
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Q. What is the force required to keep a 2 kg object moving in a circle of radius 1 m at a speed of 3 m/s?
-
A.
6 N
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B.
9 N
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C.
3 N
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D.
12 N
Solution
Centripetal force F = mv²/r = 2 kg * (3 m/s)² / 1 m = 18 N.
Correct Answer:
B
— 9 N
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Q. What is the gravitational force between two 10 kg masses separated by 2 meters?
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A.
0.25 N
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B.
5 N
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C.
10 N
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D.
20 N
Solution
Using Newton's law of gravitation, F = G(m1*m2)/r² = (6.674×10⁻¹¹)(10 kg * 10 kg) / (2 m)² = 0.25 N.
Correct Answer:
A
— 0.25 N
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Q. What is the momentum of a 10 kg object moving at 3 m/s?
-
A.
30 kg·m/s
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B.
10 kg·m/s
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C.
3 kg·m/s
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D.
0 kg·m/s
Solution
Momentum p = mv = 10 kg * 3 m/s = 30 kg·m/s.
Correct Answer:
A
— 30 kg·m/s
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Q. What is the momentum of a 3 kg object moving at 4 m/s?
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A.
12 kg·m/s
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B.
7 kg·m/s
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C.
15 kg·m/s
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D.
10 kg·m/s
Solution
Momentum p = mv = 3 kg * 4 m/s = 12 kg·m/s.
Correct Answer:
A
— 12 kg·m/s
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Q. What is the work done when a force of 50 N moves an object 3 meters?
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A.
150 J
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B.
100 J
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C.
200 J
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D.
50 J
Solution
Work W = F * d = 50 N * 3 m = 150 J.
Correct Answer:
A
— 150 J
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Q. What is the work done when a force of 50 N moves an object 4 meters in the direction of the force?
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A.
100 J
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B.
200 J
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C.
150 J
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D.
50 J
Solution
Work W = F * d = 50 N * 4 m = 200 J.
Correct Answer:
B
— 200 J
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