1. A pixie is flying directly east with a speed of 4 m/s relative to the air. Th

Question

1. A pixie is flying directly east with a speed of 4 m/s relative to the air. The air is blowing due south
at a speed of 3 m/s relative to the ground. With what speed and direction is the pixie flying relative to
the ground?
a. Not enough information is given.
b. 7 m/s southeast
c. 7 m/s southwest
d. 5 m/s southeast
e. 5 m/s southwest
f. 1 m/s southeast
g. 1 m/s southwest

2. Two children decide to go outside and play catch. If the one child throws a ball with an initial speed
of 8 m/s at an angle of 60 degrees to the horizontal, at what speed will the ball be traveling when
caught by the other child? Assume air resistance is negligible and the ball is thrown and caught at the
same height.
a. 8 m/s
b. 4 m/s
c. 16 m/s
d. Not enough information is given.

3. Imagine a rocket which is traveling between Jupiter and Saturn. If the rocket is in the middle of
empty space and needs to continue moving at a constant velocity, which of the following is the best
course of action?
a. The rocket should fire its engine at full power.
b. The rocket should stop firing its engines.
c. The rocket should fire its engines, but only a little.
d. The rocket should fire its engine in short bursts.

4. Imagine a 60 kg block sitting on a level table. Now imagine a separate 60 kg block sitting on a 20
degree incline. Which block will have a larger Normal Force acting on it?
a. The block sitting on the table.
b. The block sitting on the incline.
c. The blocks will have the same Normal Force.
d. The Normal Force depends on whether or not this is a frictionless surface.

5. A small boy notices that his ball will roll toward the back when he pulls his Radio Flier (The best
little red wagon EVER made!) forward. This phenomena is best attributed to:
a. The Law of Inertia
b. The Law of Conservation of Mass
c. The Law of Conservation of Energy
d. Magic

Explanation / Answer

1)sqrt(4^2+3^2)=5 south east=ans is D

2)ans is 8 m/s=a;due to conservation of energy

3)b

4)a

5)c

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