# Speed, distance and time/ Velocity and acceleration.

Be able to calculate speed and understand different units.
Know the difference between speed and velocity.
Be able to calculate acceleration.

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## Using the formula and different units.

we can calculate speed using the formula.

•     speed = distance
time (seconds)

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)
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## 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

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## Kinetic energy.

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.

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