Newton's Laws

Newton's
Laws of
Motion

Science with Powers

Lesson Outcomes

The students should be able to identify
and describe:

Newton's three laws of motion.

The students should be able to
explain how Newton's

laws apply to real-life situations.

Newton's Laws of Motion

Newton's Laws of Motion are a set of three

fundamental laws that describe the relationship
between an object's motion and the forces acting

upon it.

These laws explain the science behind a baseball

player throwing a ball in the air.

The first law states that an object at rest will remain at

rest, and an object in motion will continue in motion with the
same speed and in the same direction, unless acted upon by
an unbalanced force. This concept is also known as the law

of inertia.

A snowboarder gliding on ice will keep moving at a constant
speed and direction until acted upon by an unbalanced force,

like friction or an external force.

First Law of Motion

In the case of a curling stone sliding
on ice, the

unbalanced force acting
upon it is friction,

which slows it down until it stops.

In basketball, the external force is the
player's hand, which exerts a force on
the ball to make it

bounce back up after it hits the ground.

Multiple Choice

Newton's 1st law of motion states

• For every action, there is an equal but opposite reaction

• an object at rest will remain at rest and an object in motion will remain in motion unless acted upon by outside force

• acceleration depends on the object’s mass and on the net force acting on the object

Multiple Choice

Newton's 1st law is also known as the law of ___________

• force

• mass

• inertia

• gravity

Multiple Choice

If the outside forces acting on an object are not balanced, the object will change its motion.

• True

• False

Match

Place the following images in order of increasing inertia... 1 has the least and 5 has the most.

1

2

3

4

5

• 1

• 2

• 3

• 4

• 5

The acceleration of an object is directly proportional to the
net force acting on the object and inversely proportional to
its mass. This means that the greater the force applied to

an object, the greater its acceleration will be, and the
heavier the object, the slower its acceleration will be.

A baseball player can hit the ball farther and harder by

swinging the bat with a greater force, and by using a lighter

bat, which reduces the mass of the bat-ball system.

Second Law of Motion

When a hockey player hits a puck with their

stick, the force of the impact is
proportional to

the mass and acceleration of the puck.

When a quarterback throws a football, t
he force

of the throw is proportional
to the mass and

acceleration of the ball.

Multiple Choice

If you increase the force on an object, its acceleration

• decreases

• stops

• also increases

• stays the same

Multiple Choice

What is Newton's Second Law of Motion?

• An object at rest stays at rest, an object in motion stays in motion at constant velocity unless acted upon by an unbalanced force.

• The acceleration of an object depends on the mass of the object and the amount of the force applied.

• Every action has an equal and opposite reaction.

• Friction

Multiple Choice

What is Newton's Second Law known as? The law of

• Friction

• Inertia

• Action and Reaction

• Acceleration

Multiple Choice

The SI unit for force is

• Kilogram (kg)

• Meter per second (m/s)

• Newtons (N)

• Meter per second squared (m/s²)

Match

Place the following objects in order (1-5): 1 being the object that requires the LEAST amount of force that must be applied to move and 5 being the object that requires the MOST amount of force that must be applied to move.

• Cell Phone

• Brick

• Truck Engine

• Truck Without Wheels

• Ship On Land

1

2

3

4

5

• 1

• 2

• 3

• 4

• 5

The third law states that for every action, there is an

equal and opposite reaction. This means that if one
object exerts a force on another object, the second

object will exert an equal and opposite force back on the

first object.

When a skier pushes against the snow with their skis,

the snow exerts an equal and opposite force back on the

skier's skis, pushing the skier forward.

Third Law of Motion

In water flyboarding, the rider holds onto a hose
that is connected to a watercraft, which provides
the jet of water that lifts the board into the air.

When an ice track skater pushes their foot

backwards on the ice, the ice exerts an
equal and

opposite force forwards on
the skater's foot.

Multiple Choice

Newtons law states that for every action, there is an_________ reaction

• unequal and opposite

• stronger and opposite

• equal and similar

• equal and opposite

Multiple Choice

Force always come in________

• waves

• triplets

• pairs

Multiple Choice

When a heavy football player and a light one run into each other, who exerts more force

• The light one

• Their force are equal

• The heavy one

Multiple Select

Which of the images below demonstrates Newton's 3rd Law of Motion regarding "action/reaction pairs?" (there is more than 1... in other words, you must choose all that apply)

What Law of
Motion is it?

Look at the sport on the right and explain

what laws of motion can be described

based on them. Write your explanation on

a sheet of paper.

What Law of
Motion is it?

Look at the sport on the right and explain

what laws of motion can be described

based on them. Write your explanation on

a sheet of paper.

What Law of
Motion is it?

Look at the sport on the right and explain

what laws of motion can be described

based on them. Write your explanation on

a sheet of paper.

Third Law of Motion

Summary of Newton's Laws

• 1. First Law: Objects resist changes in motion

(Inertia).

• 2. Second Law: Force equals mass times

acceleration (F = ma).

• 3. Third Law: Every action has an equal and

opposite reaction.

• These laws form the foundation of classical

mechanics and are essential for understanding
the physical world.