21.
Which of the following is an example of potential energy?
A
A flowing river
B
A moving car
C
A spinning wheel
D
A book resting on a shelf
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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
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
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
Which of the following is the SI unit of weight?
Joule
Meter
Kilogram
Newton
Why do objects fall towards the Earth?
Due to magnetic force
Due to friction
Due to gravitational force
Due to air resistance
Which of the following has the highest value of gravitational acceleration?
Mars
Earth
Jupiter
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
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
What is the force of attraction between two masses called?
Gravitational force
Electromagnetic force
Frictional force
Nuclear force
What is the force of gravity on an object called?
Gravitational force
Normal force
Weight
Mass
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
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
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
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
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
What is the force that acts on an object when it is moving in a circular path?
Frictional force
Tension
Gravitational force
Centripetal force
What is the first law of motion also known as?
Law of inertia
Law of interaction
Law of force
Law of acceleration
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
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
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