Forces: Master the Fundamentals of Physics

Question 1

A car with a mass of 1000 kilograms is moving at a constant speed of 10 meters per second. What is the net force acting on the car?

Accepted Answer

0 Newtons

Answer

1000 Newtons

Answer

10,000 Newtons

Answer

100 Newtons

Question 2

Power is the rate at which work is done or energy is transferred. The SI unit of power is the watt (W). What is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Meter

Question 3

Momentum is a vector quantity that describes the product of an object's mass and velocity.

Accepted Answer

True

Answer

False

Question 4

A force of 10 N acts on an object with a mass of 2 kg. What is the acceleration of the object?

Accepted Answer

5 m/s^2

Answer

10 m/s^2

Answer

15 m/s^2

Answer

20 m/s^2

Question 5

Which of the following factors does NOT affect the force of friction?

Accepted Answer

Temperature

Answer

Surface roughness

Answer

Normal force

Answer

Coefficient of friction

Question 6

Which of the following is **not** one of Newton's three laws of motion?

Accepted Answer

The total momentum of a closed system remains constant.

Answer

An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Answer

The acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the object's mass.

Answer

For every action, there is an equal and opposite reaction.

Question 7

When an object is in equilibrium, what is true about the net force acting on the object?

Accepted Answer

It is zero.

Answer

It is non-zero.

Answer

It is positive.

Answer

It is negative.

Question 8

What is the SI unit for force?

Accepted Answer

Newton

Answer

Joule

Answer

Kilogram

Answer

Meter

Question 9

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by an unbalanced force. This concept is also known as:

Accepted Answer

Inertia

Answer

Equilibrium

Answer

Momentum

Answer

Gravity

Question 10

A ball is projected vertically upward. At its maximum height, its velocity is:

Accepted Answer

Zero

Answer

Equal to its initial velocity

Answer

Equal to half of its initial velocity

Answer

Maximum negative

Question 11

The law of conservation of momentum states that the total momentum of an isolated system remains constant in the absence of external forces.

Accepted Answer

True

Answer

False

Question 12

Which of the following forces does negative work?

Accepted Answer

Friction force

Answer

Gravitational force

Answer

Normal force

Answer

Tension force

Question 13

Which of the following is NOT a consequence of Newton's third law of motion?

Accepted Answer

The total momentum of a closed system is conserved.

Answer

For every action, there is an equal and opposite reaction.

Answer

Forces always occur in pairs.

Answer

The acceleration of an object is directly proportional to the net force acting on it.

Question 14

An object is in equilibrium when the resultant force acting on it is:

Accepted Answer

Zero

Answer

Non-zero but constant

Answer

Non-zero and increasing

Answer

Non-zero and decreasing

Question 15

In any collision, the total momentum of the system:

Accepted Answer

Remains constant

Answer

Increases

Answer

Decreases

Answer

May either increase or decrease

Question 16

A force of 20 N is exerted on an object with a mass of 5 kg. The resulting acceleration of the object will be:

Accepted Answer

2 m/s²

Answer

1 m/s²

Answer

4 m/s²

Answer

5 m/s²

Question 17

Which of the following scenarios represents a balanced force?

Accepted Answer

A stationary book resting on a table

Answer

A person pushing against an immovable wall

Answer

A ball rolling down a slope

Answer

A car undergoing acceleration

Question 18

Which factor does NOT influence the potential energy of an object?

Accepted Answer

Velocity of the object

Answer

Mass of the object

Answer

Vertical height of the object

Answer

Acceleration due to gravity

Question 19

A ball is thrown vertically upwards. At the peak of its trajectory, its velocity is:

Accepted Answer

Zero

Answer

Maximum

Answer

Minimum

Answer

Constant

Question 20

Which of the following is a vector quantity?

Accepted Answer

Acceleration

Answer

Distance

Answer

Speed

Answer

Mass

Question 21

What is the SI unit of force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Metre

Answer

Second

Question 22

Which of the following is not a type of force?

Accepted Answer

Kinetic energy

Answer

Tension

Answer

Weight

Answer

Impulse

Question 23

An object at rest remains at rest, and an object in motion remains in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This statement describes:

Accepted Answer

Newton's first law of motion

Answer

Newton's second law of motion

Answer

Newton's third law of motion

Answer

The law of universal gravitation

Question 24

When two objects collide, the total momentum of the system:

Accepted Answer

Is always conserved

Answer

Can be zero

Answer

Is proportional to the mass of the heavier object

Answer

Increases continuously over time

Question 25

Which of the following is NOT considered a fundamental force of nature?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Electromagnetic force

Answer

Strong nuclear force

Question 26

At the highest point of its trajectory, a ball thrown vertically upward has a velocity of:

Accepted Answer

0 m/s

Answer

5 m/s

Answer

10 m/s

Answer

15 m/s

Question 27

Precisely state Newton's first law of motion.

Accepted Answer

An object at rest maintains its state, and an object in motion retains its speed and direction until acted upon by an unbalanced force.

Answer

The acceleration of an object is proportionate to the net force applied.

Question 28

A car maintains a constant speed. Regarding the forces acting upon it, which statement is accurate?

Accepted Answer

The net force acting on the car is zero.

Answer

Air resistance exerts an upward force on the car.

Answer

Gravity exerts a downward force on the car.

Answer

Friction exceeds the propulsive force.

Question 29

A ball is launched vertically. At its apex, which force(s) act upon it?

Accepted Answer

Gravity

Answer

Gravity and air resistance

Answer

No forces

Answer

Air resistance only

Question 30

Identify the quantity that is NOT a vector quantity.

Accepted Answer

Mass

Answer

Acceleration

Answer

Force

Answer

Velocity

Question 31

A 10 kg object is pulled horizontally across a frictionless surface with a force of 50 N. What is the object's acceleration?

Accepted Answer

5 m/s²

Answer

500 m/s²

Answer

10 m/s²

Answer

0.2 m/s²

Question 32

A stationary object is acted upon by two forces: 10 N to the right and 5 N to the left. What is the net force acting on the object?

Accepted Answer

5 N to the right

Answer

0 N

Answer

5 N to the left

Answer

15 N to the right

Question 33

A car traveling at 20 m/s suddenly brakes and comes to a stop in 5 seconds. What is the car's average acceleration during braking?

Accepted Answer

-4 m/s²

Answer

100 m/s²

Answer

-100 m/s²

Answer

4 m/s²

Question 34

A box is at rest on a table. Which of the following statements is TRUE?

Accepted Answer

The box is in equilibrium because the forces acting on it are balanced.

Answer

The box is not in equilibrium because it is not moving.

Answer

The box is in motion because it is at rest.

Question 35

A skydiver reaches terminal velocity. This means that:

Accepted Answer

The air resistance force equals the force of gravity.

Answer

The skydiver is accelerating downwards.

Answer

The skydiver is moving at a constant speed upwards.

Question 36

A 50 kg object is moving at 10 m/s. What is its momentum?

Accepted Answer

500 kg m/s

Answer

5 kg m/s

Answer

50 kg

Question 37

A car collides head-on with a stationary truck. Which of the following statements is TRUE regarding the momentum of the system?

Accepted Answer

The total momentum of the system remains constant.

Answer

The momentum of the car remains constant.

Answer

The total momentum of the system decreases.

Answer

The total momentum of the system increases.

Question 38

A book resting on a table experiences a frictional force. This force:

Accepted Answer

Acts in the opposite direction to the potential motion of the book.

Answer

Is always equal to the weight of the book.

Answer

Acts in the same direction as the potential motion of the book.

Question 39

A ball is thrown vertically upwards. Ignoring air resistance, what is the acceleration of the ball at its highest point?

Accepted Answer

-9.8 m/s²

Answer

It depends on the ball's initial velocity.

Answer

0 m/s²

Answer

9.8 m/s²

Question 40

A rocket launches into space. What is the primary force that propels the rocket upwards?

Accepted Answer

The force generated by the expulsion of hot gases.

Answer

The force of air resistance.

Answer

The force of gravity.