Gravity pulls all objects toward the center of the Earth, causing things like pencils to fall when dropped. Friction is the force that resists the relative motion of objects in contact and can cause heat, as when rubbing hands together. Friction in car brakes and tires helps slow and stop vehicles safely. The document discusses gravity and friction, provides examples of each including falling objects and braking in cars, and asks questions to check understanding.

1. Forces:
Gravity &
Friction

2. Hold your pencil in your hand
and then let it go.
What do you think makes it
fall to the desk or ground?

3. Without
gravity…
.

4. Gravity
pulls
objects
towards
the
earth.

5. Things falling to the ground = earth’s
gravitational pull in action.

6. Friction
Rub your hands together quickly. What happens?

7. Did your hands heat up?
What causes the heat?

9. What part of the
car do you think
experiences the
most friction?
How does this
friction help us
be safe while
driving?

10. Quick check
What is gravity?
What is friction?
Can you think of any other examples of friction
or gravity that wasn’t talked about today?
Share with your table group.