# 1 of 9© Boardworks Ltd 2012. 2 of 9© Boardworks Ltd 2012 What are forces?

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1 of 9© Boardworks Ltd 2012

2 of 9© Boardworks Ltd 2012 What are forces?

3 of 9© Boardworks Ltd 2012 Push and pull

4 of 9© Boardworks Ltd 2012 All forces involve interactions between objects. There are several different types. Types of forces What forces are acting during this rocket launch? All types of forces can occur whether objects are still or moving. Gravity and magnetism are forces that can act over distances. Friction and upthrust are forces that involve direct contact between objects.

5 of 9© Boardworks Ltd 2012 Forces affecting objects

6 of 9© Boardworks Ltd 2012 Forces changing an object’s shape

7 of 9© Boardworks Ltd 2012 There are two wind machines applying forces to the ice skater. The forces acting on the skater are equal in magnitude and opposite in direction. Balanced forces The forces are balanced, so they cancel each other out. The skater does not move.

8 of 9© Boardworks Ltd 2012 Unbalanced forces Unbalanced forces lead to a change in speed or direction. What if only one wind machine is blowing on the skater? The forces acting on her are no longer balanced so she will start to move to the left. Her speed will change – this is called acceleration.

9 of 9© Boardworks Ltd 2012 Measuring forces