1. Velocity
Momentum
Impulse
Force
Weight

2. Total Momentum
System’s Center Of Mass
Motion of COM
Internal versus external interactions.
No external interactions  ptot conserved
Inertial frames of reference:
Not accelerated (not rotating or any other kind of accel…)

3. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
a) An electron
True;
False;
I don’t know.

4. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
b) An atom
True;
False;
I don’t know.

5. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
c) A rock
True;
False;
I don’t know.

6. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
d) A human being
True;
False;
I don’t know.

7. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
e) A swarm of bees
True;
False;
I don’t know.

8. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
f) The earth’s atmosphere
True;
False;
I don’t know.

9. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
g) The water in an ocean current
True;
False;
I don’t know.

10. C4T.1 Which of the following things qualifies as being an `extended object’. For each object, answer True if it does qualify.
h) A cluster of galaxies
True;
False;
I don’t know.

11. C4T.2a The following diagrams show hypothetical results for collisions between two identical balls floating in space. The blue ball was initially moving to the right, before it hit the red ball which was at rest.
True;
False;
I don’t know.

12. C4T.2b The following diagrams show hypothetical results for collisions between two identical balls floating in space. The blue ball was initially moving to the right, before it hit the red ball which was at rest.
True;
False;
I don’t know.

13. C4T.2c The following diagrams show hypothetical results for collisions between two identical balls floating in space. The blue ball was initially moving to the right, before it hit the red ball which was at rest.
True;
False;
I don’t know.

14. C4T.2d The following diagrams show hypothetical results for collisions between two identical balls floating in space. The blue ball was initially moving to the right, before it hit the red ball which was at rest.
True;
False;
I don’t know.

15. C4T.5 In a reference frame fixed on the sun, which follows the straighter (as opposed to wiggly) path?
The earth;
The moon;
The earth-moon system;
All paths have similar amount of wiggliness;

16. C4T.6 Which of the following would be an appropriate inertial reference frame for analyzing the effects of the gravitational interaction between the earth and the moon on the earth ?
A frame attached to the earth’s surface;
A non-rotating frame attached to the earth’s CM;
A non-rotating frame attached to the CM of the earth-moon system;
A non-rotating frame attached to the sun’s CM;
A non-rotating frame attached to the solar system’s CM;

17. C4R. 1 A 56-kg canoeist sits at rest at the back end of a 23-kg canoe
C4R.1 A 56-kg canoeist sits at rest at the back end of a 23-kg canoe. The canoe is at rest in the still water of a lake with its front end about 0.50 m from the dock. The canoeist realizes that she has left the paddle on the dock, so she carefully works her way to the front of the 3.8-m canoe. Is she likely to be able to reach the dock from the front of the boat?
Yes;
No;
Mmmmmhhhh….. I don’t know.

18. Mmmmmhhhh….. I don’t know.
C4R.1 A 56-kg canoeist sits at rest at the back end of a 23-kg canoe. The canoe is at rest in the still water of a lake with its front end about 0.50 m from the dock. The canoeist realizes that she has left the paddle on the dock, so she carefully works her way to the front of the 3.8-m canoe. Is she likely to be able to reach the dock from the front of the boat?
Yes;
No;
Mmmmmhhhh….. I don’t know.
x=3.2 m