September 20, 2016
Section 2 –Velocity and Momentum
Velocity – both the speed and direction of an object
Because velocity includes direction, an objects velocity can
change while the speed remains constant
glenco Physical Science 2012
September 20, 2016
Relative Motion
A reference point must be used to describe motion.
Like cars passing on the interstate
• You are riding in the car doing the passing
• You are riding in the car being passed
• You are standing on the side of the road watching two cars
pass
September 20, 2016
Momentum
Momentum – the product of an object’s mass and velocity
.
p = mv
momentum’s unit is kg m/s
Momentum is always in the same direction as the objects
velocity
.
Sharon rides her bike with a momentum of 650 kg m/s
with a velocity of 12 m/s. What is Sharon's mass?
September 20, 2016
Homework:
P 54 # 12-14
P 55 # 18,20,21