2. Apr 4 / Act E 79
Inertia Around a Curve
LEARNING TARGET: I can explain the affect inertia has on a moving object.
CH Q
How does the inertia affect how an object moves?
VOCAB: inertia
Review: acceleration, mass, force
resistance an object has to a change in its motion

3. Two cars slowing at same rate, which requires more Force – heavy or light? – and why?
heavy car - because more mass has more Inertia, so will need more Force to slow down equally with light car
the motorcycle on the right can brake faster because two brake disks have more surface area to create more friction (stopping Force)

4. PROCEDURE AND DATA
MATERIALS:
PROCEDURE: Read on pg. E and summarize
DATA: WS Inertia Observation

5. What forces could be responsible for a change in motion?
POST DISCUSSION
What forces could be responsible for a change in motion?
Changes in Motion
Force Responsible
Marble accelerated from rest
Hand
Marble goes into a circle
Inside wall of circular track
Marble slows down
Table surface, friction in circular track

6. your marble was being continually pushed by the wall to go around in a circle

7. sketch diagrams
Why does marble continue in straight line after leaving track?
no Force on marble to change motion, so Inertia takes over

8. yes, but that's because of air and mechanical friction on table/floor
POST DISCUSSION
If the marble was allowed to travel as far as it could, would it slow down and stop?
yes, but that's because of air and mechanical friction on table/floor
How would the results change if there was no friction?
marble would keep traveling forever in straight line at same speed

9. lighter, because less inertia means easier to change direction
Do you think a driver in a lighter or heavier car is more likely to be able to avoid an accident? Why?
lighter, because less inertia means easier to change direction
Who's able to change direction quicker?

10. A car heading towards a curve loses steering and brakes.
a. Draw arrow where car will go
b. why did arrow go straight ahead?
inertia (no outside force to change direction)
c. if car had more mass?
direction will stay same
(but will have more Force)
sketch picture

11. - Discuss and answer Q 1-3 on pg. E 28
ANALYSIS
- Discuss and answer Q 1-3 on pg. E 28
ANS CH Q
How does the inertia affect how an object moves? A:
it resists changes in motion
(so will keep doing what it's already doing unless a Force acts on it)
HOMEWORK
None