Q. A 15 kg box is pushed with a force of 30 N. What is the box's acceleration?
A.
1 m/s²
B.
2 m/s²
C.
3 m/s²
D.
4 m/s²
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Solution
Using F = ma, we find acceleration: a = F/m = 30 N / 15 kg = 2 m/s².
Correct Answer:
C
— 3 m/s²
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Q. A 2 kg block is pulled with a force of 10 N. What is the frictional force if the block accelerates at 3 m/s²?
A.
4 N
B.
6 N
C.
10 N
D.
8 N
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Solution
Net force = mass * acceleration = 2 kg * 3 m/s² = 6 N. The applied force is 10 N, so frictional force = applied force - net force = 10 N - 6 N = 4 N.
Correct Answer:
B
— 6 N
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Q. A car accelerates from rest to 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
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Solution
Average acceleration is calculated as (final velocity - initial velocity) / time = (20 m/s - 0 m/s) / 5 s = 4 m/s².
Correct Answer:
B
— 4 m/s²
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Q. If a 2 kg object is moving at 3 m/s, what is its momentum?
A.
6 kg·m/s
B.
5 kg·m/s
C.
3 kg·m/s
D.
2 kg·m/s
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Solution
Momentum is calculated using the formula p = mv. Thus, p = 2 kg * 3 m/s = 6 kg·m/s.
Correct Answer:
A
— 6 kg·m/s
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Q. If a 5 kg object is subjected to a net force of 15 N, what is its acceleration?
A.
3 m/s²
B.
2 m/s²
C.
1 m/s²
D.
4 m/s²
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Solution
Using Newton's second law, F = ma, we can find acceleration: a = F/m = 15 N / 5 kg = 3 m/s².
Correct Answer:
A
— 3 m/s²
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Q. If a force of 15 N is applied to a 3 kg object, what is the resulting acceleration?
A.
3 m/s²
B.
5 m/s²
C.
7 m/s²
D.
10 m/s²
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Solution
Using F = ma, we find acceleration: a = F/m = 15 N / 3 kg = 5 m/s².
Correct Answer:
B
— 5 m/s²
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Q. If an object is in free fall, what is the net force acting on it?
A.
0 N
B.
Its weight
C.
The normal force
D.
Air resistance
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Solution
In free fall, the only force acting on the object is its weight, which is the net force.
Correct Answer:
B
— Its weight
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Q. What happens to the acceleration of an object if the mass is doubled while the force remains constant?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
According to Newton's second law, if mass is doubled and force remains constant, acceleration will halve (a = F/m).
Correct Answer:
B
— It halves
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Q. What is the effect of friction on the motion of an object according to Newton's laws?
A.
It increases acceleration
B.
It decreases acceleration
C.
It has no effect
D.
It reverses direction
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Solution
Friction opposes the motion of an object, thus decreasing its acceleration according to Newton's laws.
Correct Answer:
B
— It decreases acceleration
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Q. Which of the following is an example of Newton's first law?
A.
A ball rolling on a flat surface eventually stops.
B.
A rocket launches into space.
C.
A car accelerates when the gas pedal is pressed.
D.
A person pushes a wall.
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Solution
Newton's first law states that an object will remain at rest or in uniform motion unless acted upon by a net external force. The ball rolling and eventually stopping is an example.
Correct Answer:
A
— A ball rolling on a flat surface eventually stops.
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Q. Which of the following statements is true according to Newton's third law?
A.
For every action, there is an equal and opposite reaction.
B.
Force equals mass times acceleration.
C.
An object in motion stays in motion.
D.
Mass and weight are the same.
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Solution
Newton's third law states that for every action, there is an equal and opposite reaction.
Correct Answer:
A
— For every action, there is an equal and opposite reaction.
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