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## Interaction Pairs - The bar holds the man. - The man pulls on the bar * **Force Diagrams:** * Size of arrow = size of force * Label with number of (N) ### Example **Diagram of Skateboard**: | 10N< | 25N | |--------------|-------------| | | **Diagram of...

## Interaction Pairs - The bar holds the man. - The man pulls on the bar * **Force Diagrams:** * Size of arrow = size of force * Label with number of (N) ### Example **Diagram of Skateboard**: | 10N< | 25N | |--------------|-------------| | | **Diagram of Plane**: | 200N< | | 200N Thrust | |--------------|--------------------|-----------------| | Air | | --> | | Resistance | | | ## Challenges 1. A force is a push or pull. There are two types of force: contact & non-contact 2. You measure forces in Newtons (N), with a Newton meter 3. An interaction pair is a pair of two forces that act against each other (e.g. Thrust and friction or air resistance and gravity). ## Stretch Your self **First the ball:** * **A)** The airbourne force (B) | | 5N | |---------|--------------| |