• Know that
friction and air
resistance are forces which act against motion.
• Be
able to
explain
how the surface area of an object affects
the amount of air resistance and friction.
• Be able to
explain how the shape of an object will affect
the amount of air resistance.
Task 1 - Starter
Hands up!
I know the answer!
Find someone who knows:
• at least
five words that can be
used to describe forces.
• The
units used to measure forces.
• The name of
the device used to measure
forces.
Your teacher will ask you to share your ideas
with the class, and may write some of your ideas on the
board.
Task 2 - Explaining Friction
Think hard!
Friction is caused by surfaces rubbing
together.
• Try to think of
somewhere friction is useful.
• Try to think of
somewhere friction is a problem.
Extension: rub your hands together. The frictional
forces will lead to a build up of heat energy. Your
teacher may show you the simulation below, to help explain
what causes the frictional force, and how it results in a
build up of heat.
Simulation
The
simulation below shows how two
surfaces rubbing together produces a frictional force, and
how this leads to a heating effect.
Click below to
open the simulation in full screen mode