Transcript Newton`s Laws PowerPoint

What could be another term for drag?
a)
b)
c)
d)
Sliding
friction
Fluid
friction
Balanced force
Unbalanced force
Which type of force is not acting on
the falling leaves?
a)
b)
c)
d)
Air
resistance
Gravity
Fluid
friction
Rolling
friction
The 3 Laws of
Motion
Newton’s 3 Laws of Motion

1st Law of Motion (“Law of Inertia”)
Newton’s 3 Laws of Motion

Sir Isaac Newton


English mathematician
Discovered 3 basic laws
of motion
Newton’s 3 Laws of Motion

1st Law of Motion (“Law of Inertia”)

Inertia = an object tends to resist change in its
motion
Eureka Inertia
Newton’s 3 Laws of Motion

1st Law of Motion (“Law of Inertia”)

Inertia = an object tends to resist change in its
motion

Amount of inertia
depends on object’s
mass
Which ball has the most inertia?
a)
b)
c)
d)
Golf ball
Tennis ball
Soccer ball
Bowling ball
Newton’s 3 Laws of Motion

1st Law of Motion (“Law of Inertia”)

Law says:
“An object at rest will stay at rest
and an object moving with a constant velocity will
continue moving with that constant velocity
unless acted on by an unbalanced force.”
No unbalanced forces
Foot = unbalanced force
Ball at rest
Ball accelerates
What would a flying airplane be doing
if the forces of thrust and drag are
balanced?
a)
b)
c)
d)
Sitting
still
Moving
at a constant
speed
Accelerating
The forces of thrust and
drag cannot be balanced
Where on the graph is the turtle
experiencing unbalanced forces?
a)
b)
c)
d)
Between
A&B
Between
C&D
Between
B&C
Between A & B and
between C & D
Newton’s 3 Laws of Motion

2nd Law of Motion (“F = ma”)
Newton’s 3 Laws of Motion

2nd Law of Motion (“F = ma”)

The more mass an object has, the more force is
needed to move it
Newton’s 3 Laws of Motion

2nd Law of Motion (“F = ma”)

The more mass an object has,
the more force is needed to
move it

The more force you put
on an object, the more it
will accelerate
What happens to the sled when you
add a second sled dog?
a)
b)
c)
d)
The sled’s mass will be cut in half.
The sled’s mass will double.
The sled’s acceleration will be cut in
half.
The sled’s acceleration will double.
Newton’s 3 Laws of Motion

2nd Law of Motion (“F = ma”)

Law says:
“The amount of force on an object is equal to the
object’s mass times its acceleration.”
force = mass x acceleration
acceleration = force / mass
How much force is needed to accelerate a 3 kg
skateboard at 5 m/s2?
What is the correct way to plug in the numbers?
a) F = 3 kg + 5 m/s2
b) F = 3 kg x 5 m/s2
c) F = 3 kg ÷ 5 m/s2
d) F = 5 m/s2 ÷ 3 kg
How much force is needed to accelerate a 3 kg
skateboard at 5 m/s2?
a)
b)
c)
d)
8N
8 kg
15 kg
15 N
How do you plug in the numbers to
find the sled’s acceleration?
a)
b)
c)
d)
A = 100N ÷ 50kg
A = 100N x 50kg
A = 50kg ÷ 100N
A = 50kg x 100N
What is the sled’s acceleration?
1.
2.
3.
4.
2 m/s2
0.5 m/s2
50 m/s2
5000 m/s2
What would happen to the sled’s
acceleration if the load doubled to 100kg?
a)
b)
c)
d)
The acceleration would double.
The acceleration would stay the same.
The acceleration would be cut in half.
The sled would not move.
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Newton’s 3 Laws of Motion

3rd Law of Motion (“action-reaction”)
Newton’s 3 Laws of Motion

3rd Law of Motion (“action-reaction”)

When you push on
an object, that object
also pushes back on
you
Newton’s 3 Laws of Motion

3rd Law of Motion (“action-reaction”)

Law says:
“If one object exerts a force
on another object, the second
object exerts an equal
force back on the first object.”
How does pushing backwards on
water allow you to swim?
a)
b)
c)
d)
You push the water out of
your way.
Water doesn’t have any force.
When you push the water
backward, it pushes you
forward with more force.
When you push the water
backward, it pushes you
forward with the same force.
1st Law Music Video
2nd Law Music Video
3rd Law Music Video