Forces Seeing forces Forces big and small Weight – the pull of gravity

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Presentation transcript:

Forces Seeing forces Forces big and small Weight – the pull of gravity Friction – an important force Air resistance Patterns of falling End of Unit questions

Falling through the air Air resistance Weight Weight Weight Air resistance Air resistance Contact Force Moves down slowly Moves down fast

Weight Weight balanced Air resistance Moves at steady speed

Using air resistance Flying squirrel Skydiver Race Glider

Avoids air resistance marathon Aircraft Race Car

Move easily through the air air resistance and friction streamlined

Review: True or False 1. When an object is falling in the air, air resistance is acting on it. 2. Air resistance is opposite to the direction of motion. 3. When forces on an object are not equal, we say that the forces are balanced. 4. Air resistance slows down anything that is moving.

Review: True or False 5. An object that is streamlined cannot move easily in the air. 6. A parachutist has weight and air resistance acting on him. 7. The bigger the area of the object, the bigger is the air resistance on it. 8. Air resistance is not useful.