Newtons Laws
Q. What is the gravitational force between two 5 kg masses separated by 2 meters? (G = 6.67 x 10^-11 N m²/kg²)
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A.
8.34 x 10^-11 N
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B.
1.67 x 10^-10 N
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C.
1.67 x 10^-11 N
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D.
3.34 x 10^-11 N
Solution
Using F = G(m1*m2)/r², F = (6.67 x 10^-11)(5)(5)/(2²) = 1.67 x 10^-10 N.
Correct Answer: B — 1.67 x 10^-10 N
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Q. What is the net force acting on an object at rest?
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A.
Zero
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B.
Equal to its weight
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C.
Equal to its mass
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D.
Equal to the applied force
Solution
An object at rest has no net force acting on it, according to Newton's first law.
Correct Answer: A — Zero
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Q. What is the weight of a 10 kg mass on Earth (g = 9.8 m/s²)?
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A.
9.8 N
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B.
10 N
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C.
98 N
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D.
100 N
Solution
Weight W = mg = 10 kg * 9.8 m/s² = 98 N.
Correct Answer: C — 98 N
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Q. What is the weight of a 10 kg object on Earth (g = 9.8 m/s²)?
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A.
9.8 N
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B.
10 N
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C.
98 N
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D.
100 N
Solution
Weight W = mg = 10 kg * 9.8 m/s² = 98 N.
Correct Answer: C — 98 N
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Q. What is the weight of a 10 kg object on the surface of the Earth?
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A.
10 N
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B.
100 N
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C.
1000 N
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D.
1 N
Solution
Weight W = mg = 10 kg * 10 m/s² = 100 N.
Correct Answer: B — 100 N
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Q. What is the weight of a 12 kg object on Earth?
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A.
12 N
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B.
120 N
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C.
1.2 N
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D.
0.12 N
Solution
Weight W = mg = 12 kg * 10 m/s² = 120 N.
Correct Answer: B — 120 N
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