Newton’s Laws of Motion and 2... · to change an object's motion. Momentum is always...

Newton’s Laws of Motion

Newton’s First Law

Newton’s First Law

OOPS

Newton’s First Law

Newton’s First Law

At Rest: Velocity = Zero.Won’t change without force.

In Motion: Velocity =

Speed + Direction.

Won’t change without force.

38600 kg per car22000 kg

820 kg (without person)

Newton’s First Law

Newton’s Second Law

What happens to this fraction as F (force) increases?

What happens to the acceleration if this guy doubles the amount of force?

Newton’s Second Law

What happens to this fraction as m (mass) increases?

What happens to the acceleration if the amount of mass doubles? (Same force.)

Newton’s Second Law

Newton’s Third Law

What is themisconceptionhere?

Newton’s Third Law

36,000 N36,000 N

Newton’s Third Law

Momentum

objectmass(kg)

speed(m/s)

momentum(kg m/s)

Angry rhino 1000 1

Angry bull 800 2

Which one is harder to stop?

Momentum

objectmass(kg)

speed(m/s)

momentum(kg m/s)

.45 bullet 0.015 275

Thrown Spear

1 22

Which one is harder to stop?

Momentum

objectmass(kg)

speed(m/s)

momentum(kg m/s)

.45 bullet 0.015 275 4.125

Thrown Spear

1 22 22

Which one is harder to stop?