1. V. Nonlinear Motion Projectile Motion Circular Motion Free-fall
Ch. 3 & 4 Motion & Forces
V. Nonlinear Motion
Projectile Motion
Circular Motion
Free-fall

2. A. Projectile Motion Projectile any object thrown in the air
acted upon only by gravity
follows a parabolic path called a trajectory
has horizontal and vertical velocities
PROJECTILE MINI-LAB

3. A. Projectile Motion Projectile Velocities
Horizontal and vertical velocities are independent of each other!

4. A. Projectile Motion Horizontal Velocity depends on inertia
remains constant
Vertical Velocity
depends on gravity
accelerates downward at 9.8 m/s2

5. Animation from “Multimedia Physics Studios.”
ConcepTest
A moving truck launches a ball vertically (relative to the truck). If the truck maintains a constant horizontal velocity after the launch, where will the ball land (ignore air resistance)?
A) In front of the truck
B) Behind the truck
C) In the truck
C) In the truck. The horizontal velocity of the ball remains constant and is unaffected by its vertical motion.
Animation from “Multimedia Physics Studios.”

6. B. Circular Motion Centripetal Acceleration
acceleration toward the center of a circular path
caused by centripetal force
B-BALL DEMO
PLATE DEMO

7. B. Circular Motion On the ground...
friction provides centripetal force

8. B. Circular Motion In orbit... gravity provides centripetal force
ROUND LAB

9. Near-Earth Satellites Geostationary Satellites
B. Circular Motion
In orbit...
Which satellites travel faster?
Near-Earth Satellites
Geostationary Satellites

10. B. Circular Motion Extra Credit
Use the NASA Liftoff web site to find the International Space Station (“STATION”) in the sky this weekend.
liftoff.msfc.nasa.gov/realtime/Jpass/20/
Write a brief description of your sighting - time, appearance, & other observations.

11. C. Free-Fall
Free-Fall
when an object is influenced only by the force of gravity
Weightlessness
sensation produced when an object and its surroundings are in free-fall
object is not weightless!
CUP DEMO

12. C. Free-Fall Weightlessness
surroundings are falling at the same rate so they don’t exert a force on the object

13. Space Shuttle Missions NASA’s KC-135 - “The Vomit Comet”
C. Free-Fall
Space Shuttle Missions
Go to Space Settlement Video Library.
NASA’s KC “The Vomit Comet”
Go to CNN.com.
Go to NASA.

14. ConcepTest 1 TRUE or FALSE:
An astronaut on the Space Shuttle feels weightless because there is no gravity in space.
FALSE!
There is gravity which is causing the Shuttle to free-fall towards the Earth. She feels weightless because she’s free-falling at the same rate.

15. ConcepTest 2
Describe the path of a marble as it leaves the spiral tube shown below.
It will travel in a straight line since the tube is no longer exerting a net force on it.