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.

HideShow resource information

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)
1 of 3

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

2 of 3

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.

3 of 3

Comments

No comments have yet been made

Similar Science resources:

See all Science resources »See all Physics resources »