Forces & Motion Quiz

Question 1

Newton's First Law of Motion states that:

Accepted Answer

An object remains at rest or in uniform motion unless acted upon by a net external force

Answer

Force = mass × acceleration

Answer

Every action has an equal and opposite reaction

Answer

Objects fall at the same rate regardless of mass

Question 2

Newton's Second Law states F = ma. What does each letter represent?

Accepted Answer

Force, mass, acceleration

Answer

Friction, momentum, acceleration

Answer

Force, momentum, area

Answer

Frequency, mass, amplitude

Question 3

Newton's Third Law states:

Accepted Answer

Every action has an equal and opposite reaction

Answer

Acceleration is proportional to force

Answer

Objects fall at the same rate

Answer

Velocity increases proportionally with time

Question 4

What is the unit of force in the SI system?

Accepted Answer

Newton

Answer

Joule

Answer

Watt

Answer

Pascal

Question 5

What is 'inertia'?

Accepted Answer

The tendency of an object to resist changes in its state of motion

Answer

The force of gravity on an object

Answer

The acceleration of a falling object

Answer

The friction between two surfaces

Question 6

What is the difference between speed and velocity?

Accepted Answer

Speed is how fast (scalar); velocity includes direction (vector)

Answer

They are the same thing

Answer

Speed is faster; velocity is slower

Answer

Velocity uses km/h; speed uses m/s

Question 7

What is 'momentum'?

Accepted Answer

Mass × velocity

Answer

Mass × acceleration

Answer

Force × time

Answer

Energy of motion

Question 8

What is friction?

Accepted Answer

A force that opposes relative motion between surfaces in contact

Answer

The force that pulls objects toward Earth

Answer

The force that keeps planets in orbit

Answer

The force that makes magnets attract

Question 9

What is the acceleration due to gravity on Earth's surface?

Accepted Answer

9.8 m/s²

Answer

10.2 m/s²

Answer

8.9 m/s²

Answer

11.0 m/s²

Question 10

What happens to an object in free fall (ignoring air resistance)?

Accepted Answer

It accelerates at 9.8 m/s² regardless of mass

Answer

It falls at constant speed

Answer

Heavier objects fall faster

Answer

It decelerates as it falls

Question 11

What is 'terminal velocity'?

Accepted Answer

The constant speed reached when air resistance equals the force of gravity

Answer

The maximum speed of light

Answer

The final speed of a rocket

Answer

The speed at which an object stops accelerating due to engine limits

Question 12

What is the difference between mass and weight?

Accepted Answer

Mass is the amount of matter (kg); weight is the force of gravity acting on that mass (N)

Answer

They are the same thing

Answer

Mass is measured in Newtons; weight in kilograms

Answer

Weight is constant; mass changes with location

Question 13

What is 'work' in the physics sense?

Accepted Answer

Force × distance (in the direction of force)

Answer

Any physical effort

Answer

Mass × velocity

Answer

Energy stored in an object

Question 14

What is the unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Pascal

Question 15

What is 'potential energy'?

Accepted Answer

Energy stored in an object due to its position or state

Answer

Energy of motion

Answer

Energy released by burning fuel

Answer

The energy equivalent of mass

Question 16

What is the Law of Conservation of Energy?

Accepted Answer

Energy cannot be created or destroyed — only converted between forms

Answer

Energy can be created from nothing

Answer

Energy can be destroyed but not created

Answer

Energy always increases in a closed system

Question 17

A car accelerates from 0 to 30 m/s in 10 seconds. What is its acceleration?

Accepted Answer

3 m/s²

Answer

10 m/s²

Answer

30 m/s²

Answer

300 m/s²

Question 18

What force keeps planets in orbit around the Sun?

Accepted Answer

Gravitational force

Answer

Magnetic force

Answer

Nuclear force

Answer

Electromagnetic force

Question 19

What is 'elastic potential energy'?

Accepted Answer

Energy stored in a stretched or compressed elastic material

Answer

Energy in elastic bands only

Answer

Kinetic energy of an elastic collision

Answer

Energy that can stretch to fill a container

Question 20

What is 'centripetal force'?

Accepted Answer

The inward force required to keep an object moving in a circular path

Answer

A force that pushes objects outward in a circle

Answer

The force that acts outward on a spinning object

Answer

Gravity at the centre of the Earth