1. Given the two vectors below, draw the vector: a) A + B and label it. b) A - B and label it.

2. Circle the correct answer.

A) 5 kg Mass B) 50 kg mass C) They both go the same height, but it takes the 5 kg mass longer to get to that height. D) The both go the same height in the same time.

3. The famous Daredevil Gazelle Gi-Gi is going to demonstrate just how precise she can jump by playing Gi-Gi basketball. She is going to leap from the floor and into a large basket attached to the wall of the stadium. Actually, all she can do well is control her speed and angle of take off. She relies on her staff physicst to decide the location of take off and landing. If she is to take off from a point 80 meters from the wall, at a speed of 60 m/s and an angle of 53° , at what height on the wall should the basket be placed for her landing?

4. Use the figure below for problems 3a, 3b and 3c.

a. If the pulling force P is 150 N and the crate doesn't move, what is the magnitude of friction force f?

b. If the pulling force P is 200 N and the crate doesn't move, what is the magnitude of friction force f?

c. If the force P is 250 N, what force of sliding friction f is necessary to keep the crate sliding at constant velocity?

5.

6. What does each of the scales read in the picture below ?

7. A girl is pulling a 5 kg block up a hill by pulling on it with a horizontal force of 100 N as indicated in the figure. Find the acceleration of the block.


8. Why is it that an astronaut in a space capsule orbiting the earth feels weightless?

9. A car travelling on a straight road at 9 m/s goes over a hump in the road. The hump may be regarded as a circluar arc of radius 11 m. What is the apparent weight of the 600 N driver as she rides over the hump?
10. A miner is pulling a wagon of supplies to the top of a hill where he lives by hanging from a rope attached to the wagon. As the cart moves at increasing speed up the hill, the miner moves with increasing speed downward. Which is greater, T or his weight ? (You must draw a FBD to receive any credit.)

11. A 5-kg penguin sits on top of a 10-kg sled, as in Figure below. A horizontal force of 60 N is applied to the sled, but the penguin attempts to impede the motion by holding onto a cord attached to a wall The coefficient of kinetic friction between the moving surfaces is 0.3.

Draw the force diagram for the penguin and identify the Newton's third law reaction force for each force you include. In fact, place these pairs in a nice neat two coluimn table.

10 pts Bonus! Find the tension in the rope.