Motion and Forces: Master the Fundamentals of Physics

Question 1

According to Newton's first law of motion, what happens to an object at rest?

Accepted Answer

It remains at rest unless acted upon by an unbalanced force.

Answer

It moves at a constant velocity unless acted upon by an unbalanced force.

Answer

It accelerates unless acted upon by an unbalanced force.

Question 2

Which force is responsible for objects falling towards the Earth?

Accepted Answer

Gravity

Answer

Friction

Answer

Electromagnetic force

Answer

Nuclear force

Question 3

What is the SI unit of force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Meter

Question 4

What is the rate of change of velocity called?

Accepted Answer

Acceleration

Answer

Velocity

Answer

Displacement

Question 5

Which of the following quantities is calculated by multiplying mass and velocity?

Accepted Answer

Momentum

Answer

Force

Answer

Energy

Question 6

Which quantity has both magnitude and direction?

Accepted Answer

Force

Answer

Temperature

Answer

Mass

Question 7

When is work done?

Accepted Answer

When a force is applied to an object and the object moves in the direction of the force.

Answer

When an object is at rest.

Answer

When an object accelerates.

Question 8

Which equation represents power?

Accepted Answer

Power = Work / Time

Answer

Power = Force x Distance

Answer

Power = Mass x Acceleration

Question 9

Which example best illustrates Newton's third law of motion?

Accepted Answer

A rocket propelling itself forward by expelling exhaust gases.

Answer

A ball bouncing off a wall.

Answer

A car braking to a stop.

Question 10

According to Newton's First Law of Motion, an object at rest will remain at rest unless acted upon by an external force. True or False?

Accepted Answer

True

Answer

False

Question 11

The force that attracts objects towards each other is known as:

Accepted Answer

Gravity

Answer

Electromagnetism

Answer

Friction

Answer

Tension

Question 12

Which of the following is NOT a fundamental unit in the International System of Units (SI)?

Accepted Answer

Pound

Answer

Meter

Answer

Kilogram

Answer

Second

Question 13

The momentum of an object is calculated by multiplying its mass by its:

Accepted Answer

Velocity

Answer

Weight

Answer

Acceleration

Answer

Force

Question 14

The rate at which energy is transferred or converted is known as:

Accepted Answer

Power

Answer

Speed

Answer

Force

Answer

Acceleration

Question 15

According to Newton's Third Law of Motion, for every action force, there is an equal and opposite:

Accepted Answer

Reaction force

Answer

Friction force

Answer

Gravitational force

Answer

Electromagnetic force

Question 16

When an object's velocity changes by the same amount in equal intervals of time, it is undergoing:

Accepted Answer

Uniform acceleration

Answer

Non-uniform acceleration

Answer

Constant velocity

Answer

Zero acceleration

Question 17

The SI unit of energy is the:

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kelvin

Question 18

Which of the following is the SI unit of force?

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Kilogram

Question 19

A car accelerates at a constant rate from rest to a speed of 20 m/s in 5 seconds. Calculate the magnitude of the acceleration.

Accepted Answer

10 m/s²

Answer

4 m/s²

Answer

20 m/s²

Answer

40 m/s²

Question 20

Which of the following is an example of a contact force?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Electrostatic force

Answer

Magnetic force

Question 21

The momentum of an object is defined as the product of its mass and

Accepted Answer

Velocity

Answer

Acceleration

Answer

Force

Answer

Energy

Question 22

Which of the following describes the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

Momentum is always conserved in a closed system.

Answer

The total force acting on an object is equal to its mass times its acceleration.

Answer

An object at rest will remain at rest, and an object in motion will continue to move at a constant velocity unless acted upon by an unbalanced force.

Question 23

Which of the following is an example of a centripetal force?

Accepted Answer

Tension in a string attached to a rotating object

Answer

Gravitational force between the Earth and the Moon

Answer

Frictional force between a car and the road

Answer

Electrostatic force between two charged particles

Question 24

A person pushes a box with a force of 100 N. If the coefficient of friction between the box and the floor is 0.2, what is the acceleration of the box?

Accepted Answer

40 m/s²

Answer

20 m/s²

Answer

60 m/s²

Answer

80 m/s²

Question 25

Which of the following is the formula for kinetic energy?

Accepted Answer

KE = 1/2 mv²

Answer

KE = mv

Answer

KE = mgh

Answer

KE = Fd

Question 26

Friction can have both positive and negative effects. Explain how friction can be both advantageous and detrimental in different situations.

Accepted Answer

Friction can be either advantageous or detrimental depending on the situation.

Answer

Friction is always beneficial because it prevents objects from slipping.

Answer

Friction is always detrimental because it slows down objects.

Question 27

Which of the following physical quantities is NOT considered a force?

Accepted Answer

Velocity

Answer

Tension

Answer

Gravity

Answer

Friction

Question 28

A vehicle with a mass of 1000 kilograms (kg) travels at a velocity of 20 meters per second (m/s). Calculate the momentum of the vehicle.

Accepted Answer

20,000 kg m/s

Answer

1000 kg m/s

Answer

1000 m/s

Answer

20,000 m/s

Question 29

Identify the SI unit of energy.

Accepted Answer

Joule

Answer

Meter per second

Answer

Newton

Answer

Kilogram

Question 30

When a ball is thrown vertically upward, at the highest point of its journey, its velocity is:

Accepted Answer

Zero

Answer

Maximum

Answer

Minimum

Answer

Constant

Question 31

A car travels at a constant velocity of 100 kilometers per hour (km/h). Determine the net force acting on the car.

Accepted Answer

Zero

Answer

1000 N

Answer

10,000 N

Answer

100 N

Question 32

Identify the SI unit of acceleration.

Accepted Answer

Meter per second squared

Answer

Miles per hour

Answer

Newton

Answer

Kilometer per hour

Question 33

A block slides down an inclined plane. Which of the following forces is doing work on the block?

Accepted Answer

Gravity

Answer

Normal force

Answer

Tension

Answer

Friction

Question 34

A ball is launched vertically upward with an initial velocity of 20 m/s. What is its maximum height?

Accepted Answer

(v²) / (2g)

Answer

(2v) / g

Answer

(v) / (2g)

Answer

(v²) / g

Question 35

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Energy

Answer

Mass

Answer

Temperature

Question 36

Which of the following is a fundamental force?

Accepted Answer

Electrostatic force

Answer

Drag force

Answer

Tension force

Answer

Frictional force

Question 37

According to Newton's first law of motion, an object at rest will remain at rest, and an object in motion will persist in motion with an unvarying velocity, unless acted upon by an unbalanced force.

Accepted Answer

True

Answer

False

Answer

Only if the surfaces are completely frictionless and level.

Question 38

The momentum of an object is a measure of its mass in motion and is calculated as the product of its mass and velocity.

Accepted Answer

True

Answer

Only if the object is accelerating.

Answer

Only if the object has a constant velocity.

Answer

False

Question 39

Which of the following types of forces act without any physical contact between the interacting objects?

Accepted Answer

Magnetic force

Answer

Normal force

Answer

Friction

Answer

Tension

Question 40

Energy is a property of objects and systems that is transferred and transformed in various ways, and is the ability to do work.

Accepted Answer

True

Answer

Only if the system is closed.

Answer

False

Answer

Only if the energy is in kinetic form.

Question 41

Which of the following is a type of potential energy, representing the energy stored in an object due to its position or condition?

Accepted Answer

Elastic energy

Answer

Kinetic energy

Answer

Thermal energy

Question 42

Work done on an object, which is expressed as the product of force applied and the displacement of the object in the direction of the force, is equal to the change in the object's kinetic energy.

Accepted Answer

True

Answer

False

Answer

Only if the object is moving in a straight line.

Answer

Only if the force is constant.

Question 43

Friction is a force that opposes the relative motion of two objects in contact, and is caused by surface interactions as they resist sliding past one another.

Accepted Answer

True

Answer

False

Answer

Only if the objects are moving at high speeds.

Answer

Only if the surfaces are rough.

Question 44

The gravitational constant is a fundamental physical constant that governs the strength of gravitational attraction between any two objects with mass.

Accepted Answer

Gravitational constant

Answer

Planck's constant

Answer

Avogadro's number

Answer

Coulomb's constant

Question 45

Which of the following best describes Newton's first law of motion, also known as the law of inertia?

Accepted Answer

An object at rest will remain at rest, and an object in motion will continue moving at the same speed and in the same direction unless acted upon by an unbalanced force.

Answer

An object in motion will eventually come to rest.

Question 46

A ball is thrown vertically upward. At the highest point of its trajectory, what is its velocity?

Accepted Answer

Zero.

Answer

Maximum and negative.

Answer

Maximum and positive.

Answer

Constant and positive.

Question 47

Which of the following is the SI unit of force?

Accepted Answer

Newton.

Answer

Kilogram.

Answer

Meter.

Question 48

Which of the following is a scalar quantity? (Hint: Scalar quantities have only magnitude)

Accepted Answer

Speed.

Answer

Momentum.

Answer

Force.

Answer

Acceleration.

Question 49

Which of the following statements best describes the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, but only transferred or transformed from one form to another.

Answer

Energy can be created from nothing.

Answer

Energy is always conserved in a closed system.

Question 50

A car initially at rest accelerates to a speed of 60 mph. Which of the following describes the car's motion during the acceleration phase?

Accepted Answer

Acceleration

Answer

Inertia

Answer

Deceleration

Answer

Constant velocity

Question 51

A heavy crate is pushed across a rough floor with a constant force. Which of the following statements about the crate's motion is true?

Accepted Answer

It will reach a constant velocity due to the opposing force of friction.

Answer

It will move with a constant acceleration.

Answer

It will accelerate until it reaches a maximum speed.

Question 52

A ball is thrown vertically upward. At its highest point, what is its velocity?

Accepted Answer

0 m/s

Answer

Cannot be determined without more information

Answer

9.8 m/s downward

Answer

Equal to its initial velocity

Question 53

An object with a mass of 10 kg moves at a velocity of 5 m/s. What is its momentum?

Accepted Answer

50 kg m/s

Answer

15 kg m/s

Answer

2 kg m/s

Question 54

In a car crash, which of the following does NOT affect the impact force?

Accepted Answer

The color of the car

Answer

The time it takes for the collision

Answer

The mass of the colliding vehicles

Answer

The speed of the vehicles

Question 55

According to Newton's Third Law of Motion, for every force exerted, there is an equal and opposite _____.

Accepted Answer

Force

Answer

Acceleration

Answer

Motion

Answer

Reaction

Question 56

As a roller coaster car descends a hill, what happens to its potential energy?

Accepted Answer

It is converted into kinetic energy.

Answer

It is lost due to friction.

Answer

It is converted into thermal energy.

Answer

It remains constant.

Question 57

An object at rest has ____ kinetic energy.

Accepted Answer

Zero

Answer

Variable

Answer

Potential

Answer

Maximum

Question 58

When a person pushes a crate across the floor, which of the following is an example of an external force acting on the crate?

Accepted Answer

The force applied by the person

Answer

The force of inertia

Answer

The force of friction between the crate and the floor

Answer

The force of gravity acting on the crate

Question 59

A car traveling at 20 m/s increases its speed to 30 m/s in 5 seconds. What is the acceleration of the car?

Accepted Answer

2 m/s²

Answer

5 m/s²

Answer

4 m/s²

Answer

10 m/s²