Using the formula and different units.
we can calculate speed using the formula.
- speed = distance
Speed can have different units.
- Miles per hour (mph)
- kilometers per hour
- knotts (used on boats)
- meters per second (m/s)
- meters per hour (m/h)
Velocity and acceleration.
Velocity is "speed in a given direction"
Acceleration is a measure of how quicly velocity changes.
Acceleration = change in velocity
in (m/s) time taken
example: A cyclist accelerates from 0 to 10m/s in 5 seconds, what is her acceleration?
a = v-u = 10-0 = 10 = 2m/s
t 5 5
Any object that is moving has kinetic energy.
Kinetic energy increases when:
- velocity increases
- mass increases
Example:A ball thrown into the air gradually its kinetic energy
is transferred to gravitational potential energy.
As the ball falls back down its gravitational potential
energy is transferred into kinetic.
when a car brakes to slow down, kinetic energy is tranformed
into thermal energy.