In this activity, we will be learning to understand changing speed.

You can probably think of lots of times in your life where you have been speeding up and slowing down: going down the stairs, running down the corridor (oops!), arriving at your friend's house on your bike - just everyday events.

Speeding up and slowing down involve forces.

In this activity, you can join Callum and his chums playing in the park and trying to find out how to make themselves move faster and slower.

Everything they do or play on involves forces.

See if you can use your knowledge and understanding to work out what's happening in the questions in this activity.

Up, up and away!

Want a bit more help with this before you begin? Why not watch this short video?