1. How do we
describe motion?
Speed: Rate at which object moves.
Velocity: Speed and direction.
Acceleration: Any change in
velocity; units of speed/time.
Acceleration
of Gravity
All falling objects accelerate at
the same rate (not counting friction of air resistence).
Galileo showed that g is the same
for all falling objects.
Momentum and
force
A net force changes momentum, which generally means acceleration
(change in velocity).
The rotational momentum of a spinning or orbiting object
known as angular momentum.
2. How is
mass different from weight?
Mass- the amount of matter in an
object.
Weight- the force that acts on an
object.
Why are
astronauts weightless in space?
There is gravity is space
Weightlessness is due to a constant state
of free fall.
1 comment:
The mathematical part of mechanics is called kinematics.
http://en.wikipedia.org/wiki/Kinematics
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