Page 90 - York Global Science 6 - Physical Science
P. 90
Objects often have different types of force
acting on them at the same time.
Look at this parachute.
1 What non-contact force is acting on it?
2 What contact force is acting on it?
3 Explain how the parachute needs
forces to work.
Remember!
Friction is a force that works against a moving object to slow it down. When
an object moves, the object and the surface it is touching move against
each other. A rough surface exerts more friction than a smooth surface.
Friction can be helpful or unhelpful.
Air resistance is a type of friction that acts when an object moves through
air. This makes it harder for the object to move. Fast moving objects and
objects with a bigger surface area have more air resistance.
Air resistance can be helpful or unhelpful.
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