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Physics · Question 21
A moving object has zero resultant external force. What happens to its velocity in an inertial frame?
It remains constant
It continually increases
It reverses every second
It always becomes zero
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Correct answer: A
It remains constant
Zero resultant force means no acceleration, so velocity stays constant.
Physics · Question 22
A hand pushes a wall. The wall pushes back on the hand. These two forces act on what?
The same object in all cases
Only the hand
Different objects
Only the wall
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Correct answer: C
Different objects
A third-law force pair acts on two different interacting objects.
Physics · Question 23
Which listed quantity requires both magnitude and direction?
Mass
Temperature
Velocity
Time interval
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Correct answer: C
Velocity
Velocity is a vector; the other listed quantities are scalars.
Physics · Question 24
A 3 kg object moves at 4 m/s. What is its momentum magnitude?
7 kg m/s
12 kg m/s
1.33 kg m/s
48 kg m/s
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Correct answer: B
12 kg m/s
Momentum magnitude is mass times speed: 3 × 4 = 12 kg m/s.
Physics · Question 25
What net force gives a 4 kg cart an acceleration of 3 m/s²?
7 N
1 N
12 N
24 N
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Correct answer: C
12 N
F = ma = 4 × 3 = 12 N.
Physics · Question 26
A net force of 18 N causes 6 m/s² acceleration. What is the object’s mass?
24 kg
3 kg
12 kg
108 kg
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Correct answer: B
3 kg
Rearrange F = ma: m = F/a = 18/6 = 3 kg.
Physics · Question 27
A 5 kg trolley experiences a net force of 20 N. What is its acceleration?
4 m/s²
100 m/s²
15 m/s²
25 m/s²
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Correct answer: A
4 m/s²
Acceleration is net force divided by mass: 20/5 = 4 m/s².
Physics · Question 28
Two carts receive the same net force. One has twice the mass of the other. Its acceleration is what fraction of the lighter cart’s?
Two
The same
Four
One half
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Correct answer: D
One half
For fixed net force, acceleration is inversely proportional to mass.
Physics · Question 29
Which is the SI base unit for mass?
Metre
Joule
Newton
Kilogram
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Correct answer: D
Kilogram
Mass uses kilograms; newtons measure force and joules measure energy.
Physics · Question 30
What does the SI unit symbol A represent?
Acceleration
Ampere
Atmosphere
Area
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Correct answer: B
Ampere
A denotes the ampere, the SI base unit of electric current.