69 practice sets · Page 2 of 4
Which of the following is an example of potential energy?
A flowing river
A moving car
A spinning wheel
A book resting on a shelf
Correct Answer: D — A book resting on a shelf
Explanation:
A book on a shelf possesses gravitational potential energy due to its position.
What is the condition for work to be done by a force?
The force must be zero
There must be a displacement in the direction of the applied force
The object must be at rest
The displacement must be perpendicular to the force
Correct Answer: B — There must be a displacement in the direction of the applied force
Explanation:
Work is done when a force causes displacement in its direction.
Which of the following has the largest gravitational force?
A 100 kg object on Earth
A 10 kg object on the Moon
A 1 kg object on Earth
A 1000 kg object in space
Correct Answer: A — A 100 kg object on Earth
Explanation:
A 100 kg object on Earth experiences the greatest gravitational force due to Earth's gravity and the large mass.
Which of the following is the SI unit of weight?
Joule
Meter
Kilogram
Newton
Correct Answer: D — Newton
Explanation:
Weight is a force, so its SI unit is the newton.
Why do objects fall towards the Earth?
Due to magnetic force
Due to friction
Due to gravitational force
Due to air resistance
Correct Answer: C — Due to gravitational force
Explanation:
Earth's gravitational force pulls objects toward its center.
Which of the following has the highest value of gravitational acceleration?
Mars
Earth
Jupiter
The Moon
Correct Answer: C — Jupiter
Explanation:
Jupiter has a higher gravitational acceleration than Earth, Mars, or the Moon.
What happens to the gravitational force if the distance between two objects is halved?
It becomes half
It becomes four times
It remains unchanged
It becomes double
Correct Answer: B — It becomes four times
Explanation:
Gravitational force varies inversely with the square of distance.
What is the gravitational force between two objects with masses m₁ and m₂ separated by a distance r?
F = G(m₁ × m₂)/r²
F = G(m₁ + m₂)/r
F = Gm₁m₂ × r²
F = G/r²
Correct Answer: A — F = G(m₁ × m₂)/r²
Explanation:
Newton's law of gravitation is F = G(m₁m₂)/r².
What is the force of attraction between two masses called?
Gravitational force
Electromagnetic force
Frictional force
Nuclear force
Correct Answer: A — Gravitational force
Explanation:
The attractive force between masses is called gravitational force.
What is the force of gravity on an object called?
Gravitational force
Normal force
Weight
Mass
Correct Answer: C — Weight
Explanation:
Weight is the gravitational force acting on an object.
If the force acting on an object is doubled, what happens to its acceleration?
It is halved
It is quadrupled
It remains the same
It is doubled
Correct Answer: D — It is doubled
Explanation:
Acceleration is directly proportional to force.
Which of the following is an example of balanced forces?
A moving car speeding up
A book resting on a table
A moving car slowing down
A ball thrown upward
Correct Answer: B — A book resting on a table
Explanation:
The upward normal force and downward gravitational force balance each other.
What is the effect of force on a stationary object?
It accelerates the object
It makes the object move
It changes its shape
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
Force can move, accelerate, or change the shape of an object.
Which is an example of inertia in daily life?
A stone falling from a height
A passenger moving forward when the bus suddenly stops
A car skidding on a wet road
A bus moving faster on a smooth road
Correct Answer: B — A passenger moving forward when the bus suddenly stops
Explanation:
The passenger continues moving forward due to inertia.
Which law of motion is associated with the concept of action and reaction forces?
Newton's Third Law
Newton's First Law
Newton's Second Law
Newton's Law of Gravitation
Correct Answer: A — Newton's Third Law
Explanation:
Newton's Third Law states that every action has an equal and opposite reaction.
What is the force that acts on an object when it is moving in a circular path?
Frictional force
Tension
Gravitational force
Centripetal force
Correct Answer: D — Centripetal force
Explanation:
Centripetal force keeps an object moving along a circular path.
What is the first law of motion also known as?
Law of inertia
Law of interaction
Law of force
Law of acceleration
Correct Answer: A — Law of inertia
Explanation:
Newton's First Law is called the Law of Inertia.
What does Newton's Second Law of Motion state?
An object will remain at rest or in uniform motion unless acted upon by an external force
Every action has an equal and opposite reaction
Force is equal to mass times acceleration
Force is inversely proportional to mass
Correct Answer: C — Force is equal to mass times acceleration
Explanation:
Newton's Second Law states that F = ma.
Which of the following does not affect the speed of an object?
The distance traveled
The object's mass
The force acting on the object
The time of motion
Correct Answer: B — The object's mass
Explanation:
Mass does not directly determine the speed of an object.
If an object covers 50 meters in 5 seconds, what is its speed?
5 m/s
10 m/s
2 m/s
25 m/s
Correct Answer: B — 10 m/s
Explanation:
Speed = distance ÷ time = 50 ÷ 5 = 10 m/s.
