newton’s laws of motion and 2... · to change an object's motion. momentum is always...
TRANSCRIPT
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?