Forces: Master the Fundamentals of Physics

Question 1

Which force causes an apple to fall from a tree?

Accepted Answer

Gravity

Answer

Friction

Answer

Electromagnetism

Answer

Nuclear force

Question 2

The SI unit of force is the:

Accepted Answer

Newton

Answer

Meter

Answer

Joule

Answer

Kilogram

Question 3

An object is at rest on a horizontal, frictionless surface. Which of the following forces is NOT acting on the object?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Normal force

Answer

Tension force

Question 4

A car is moving at a constant velocity on a level road. Which of the following forces is the net force acting on the car?

Accepted Answer

Zero

Answer

Gravitational force

Answer

Frictional force

Answer

Normal force

Question 5

A ball is thrown vertically upwards. At the highest point of its trajectory, which of the following forces is acting on the ball?

Accepted Answer

Gravitational force only

Answer

Gravitational force and normal force

Answer

Gravitational force and air resistance

Question 6

Which of the following is a characteristic of electromagnetic force?

Accepted Answer

It can act over large distances

Answer

It is always attractive

Answer

It is the weakest fundamental force

Answer

It is a contact force

Question 7

An example of an application of forces is:

Accepted Answer

Designing bridges

Answer

Playing music

Answer

Cooking food

Question 8

Which equation correctly describes the relationship between an object's acceleration (a), force (F), and mass (m) according to Newton's second law of motion?

Accepted Answer

a = F / m

Answer

a = F * m

Answer

a = m / F

Answer

a = m^2 / F

Question 9

Which of the following is NOT a fundamental type of force recognized in physics?

Accepted Answer

Velocity

Answer

Electromagnetic force

Answer

Strong nuclear force

Answer

Gravitational force

Question 10

Which fundamental force is responsible for keeping objects on the ground and causing them to fall?

Accepted Answer

Gravitational force

Answer

Electromagnetic force

Answer

Frictional force

Answer

Nuclear force

Question 11

Which fundamental force is responsible for attracting or repelling charged particles, such as electrons and protons?

Accepted Answer

Electromagnetic force

Answer

Gravitational force

Answer

Strong nuclear force

Answer

Frictional force

Question 12

If two forces of equal magnitude act on an object in opposite directions, what is the net force acting on the object?

Accepted Answer

Zero

Answer

The force of the smaller magnitude

Answer

The force of the larger magnitude

Answer

The sum of the two forces

Question 13

What is the SI unit of force?

Accepted Answer

Newton (N)

Answer

Second (s)

Answer

Meter (m)

Answer

Kilogram (kg)

Question 14

According to Newton's second law of motion, what is the relationship between force (F), mass (m), and acceleration (a)?

Accepted Answer

F = m * a

Answer

a = F / m

Answer

m = F * a

Answer

F = a / m

Question 15

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

Accepted Answer

Frictional force

Answer

Tension force

Answer

Electromagnetic force

Answer

Gravitational force

Question 16

What is the primary purpose of using free body diagrams when analyzing forces?

Accepted Answer

To represent all the external forces acting on an object

Answer

To determine the acceleration of an object

Answer

To predict the future motion of an object

Answer

To calculate the mass of an object

Question 17

Which of the following is a scalar quantity?

Accepted Answer

Magnitude

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 18

Which of the following factors influence the magnitude of the gravitational force between two objects?

Accepted Answer

Mass and distance

Answer

Shape and size

Answer

Mass only

Answer

Distance only

Question 19

Which of the following is Newton's third law of motion?

Accepted Answer

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

Answer

An object at rest remains at rest unless acted on by a net force, and an object in motion remains in motion unless acted on by a force.

Answer

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

Question 20

Which of the following is a quantity described by both magnitude and direction?

Accepted Answer

Force

Answer

Volume

Answer

Mass

Answer

Temperature

Question 21

A rocket engine exerts a force of 1000 N on a rocket. If the rocket has a mass of 200 kg, what is its acceleration?

Accepted Answer

5 m/s^2

Answer

2 m/s^2

Answer

10 m/s^2

Answer

1 m/s^2

Question 22

Which of the following is the SI unit of force?

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Kilogram

Question 23

Which of the following is NOT a type of force that can be exerted on an object?

Accepted Answer

Thought

Answer

Electromagnetic

Answer

Frictional

Answer

Gravitational

Question 24

Which force is primarily responsible for keeping the planets in orbit around the Sun?

Accepted Answer

Gravitational

Answer

Magnetic

Answer

Electrical

Answer

Frictional

Question 25

Which of the following factors does NOT affect the magnitude of frictional force?

Accepted Answer

Humidity

Answer

Normal force

Answer

Surface roughness

Answer

Coefficient of friction

Question 26

What is the SI unit of force?

Accepted Answer

Newton (N)

Answer

Joule (J)

Answer

Watt (W)

Answer

Kelvin (K)

Question 27

Which of the following scenarios represents a balanced force?

Accepted Answer

A car moving at a constant speed on a level road

Answer

A skydiver falling towards the ground

Answer

A person pushing against a wall that does not move

Answer

A ball rolling down a slope

Question 28

Which formula correctly represents the calculation of gravitational force between two objects?

Accepted Answer

F = Gm1m2/r^2

Answer

F = ma

Answer

F = kx

Answer

F = q1q2/r^2

Question 29

Which of the following forces is responsible for the attraction between a magnet and a piece of metal?

Accepted Answer

Magnetic

Answer

Electrostatic

Answer

Frictional

Answer

Gravitational

Question 30

How can you differentiate static friction from kinetic friction?

Accepted Answer

Static friction acts on stationary objects, while kinetic friction acts on objects in motion.

Answer

Static friction is always greater than kinetic friction.

Answer

Kinetic friction only occurs on horizontal surfaces.

Question 31

Which example illustrates the electromagnetic force?

Accepted Answer

The attraction between a positively charged rod and a negatively charged rod

Answer

The force between a book resting on a table

Answer

The force between a hammer striking a nail

Question 32

Which equation represents Newton's second law of motion, relating force, mass, and acceleration?

Accepted Answer

F = ma

Answer

m = F/a

Answer

F = m/a

Answer

a = F/m

Question 33

A car travels at a constant speed on a straight road. What can be said about the forces acting on the car?

Accepted Answer

The forces acting on the car are balanced.

Answer

The car is not subject to any forces.

Answer

The forces acting on the car are unbalanced.

Answer

There is only one force acting on the car.

Question 34

A book rests on a table. Which force prevents the book from falling through the table?

Accepted Answer

Normal force

Answer

Gravitational force

Answer

Frictional force

Answer

Applied force

Question 35

You push a heavy box across a rough floor. Which force directly opposes the box's motion?

Accepted Answer

Friction

Answer

Air resistance

Answer

Normal force

Answer

Gravity

Question 36

A magnet attracts a piece of iron. What type of force causes this attraction?

Accepted Answer

Magnetic force

Answer

Gravitational force

Answer

Electrostatic force

Answer

Normal force

Question 37

A skydiver falls through the air. At terminal velocity, which statement is true?

Accepted Answer

The force of gravity is equal to the force of air resistance.

Answer

The force of gravity is zero.

Answer

The skydiver is accelerating downwards.

Answer

The skydiver is not subject to any forces.

Question 38

Which of the following is NOT a unit of force?

Accepted Answer

Kilogram

Answer

Pound-force

Answer

Newton

Answer

Dyne

Question 39

You stand on a scale in an elevator. The elevator accelerates upwards. What does the scale read?

Accepted Answer

More than your actual weight

Answer

Zero

Answer

The same as your actual weight

Answer

Less than your actual weight

Question 40

Two objects, one with mass 1 kg and the other 2 kg, are dropped from the same height simultaneously. Neglecting air resistance, which object hits the ground first?

Accepted Answer

They will hit the ground at the same time.

Answer

The 1 kg object

Answer

The 2 kg object

Answer

It's impossible to determine.

Question 41

A book is placed on a table.  The book experiences a downward force due to gravity and an upward force from the table. These forces are balanced, resulting in the book remaining stationary. What is this state of balanced forces called?

Accepted Answer

Equilibrium

Answer

Friction

Answer

Inertia

Answer

Acceleration

Question 42

A car accelerates from rest. What force is primarily responsible for this change in motion?

Accepted Answer

Net force

Answer

Gravitational force

Answer

Frictional force

Answer

Normal force

Question 43

A box slides down a ramp. Which type of force acts against the box's motion, slowing it down?

Accepted Answer

Friction

Answer

Gravity

Answer

Normal force

Answer

Air resistance

Question 44

A magnet attracts a piece of iron. What type of force is responsible for this attraction?

Accepted Answer

Electromagnetic force

Answer

Weak nuclear force

Answer

Gravitational force

Answer

Strong nuclear force

Question 45

A ball is thrown vertically upwards.  As it travels upward, what happens to the ball's velocity?

Accepted Answer

It decreases

Answer

It increases

Answer

It remains constant

Answer

It changes direction

Question 46

A heavy box is pushed across a rough floor. How does friction affect the box's motion?

Accepted Answer

It opposes the box's motion, reducing its acceleration

Answer

It increases the box's acceleration

Answer

It has no effect on the box's motion

Question 47

A car travels at a constant speed. What can you conclude about the forces acting on the car?

Accepted Answer

The forces are balanced

Answer

The car is accelerating

Answer

There is a net force acting on the car

Answer

There is no force acting on the car

Question 48

According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. Which of the following best demonstrates this law?

Accepted Answer

When you jump, your feet push down on the ground, and the ground pushes back up on your feet.

Answer

A car accelerates from rest due to the force of the engine.

Answer

A book resting on a table experiences a downward force due to gravity.

Question 49

A skydiver jumps out of an airplane. As the skydiver falls, air resistance increases. What happens to the skydiver's acceleration?

Accepted Answer

It decreases

Answer

It increases

Answer

It remains constant

Answer

It becomes zero

Question 50

A ball rolls across a horizontal surface. What force causes the ball to eventually come to a stop?

Accepted Answer

Friction

Answer

Air resistance

Answer

Gravity

Answer

Normal force