Assignment 2-1
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1. Draw a system diagram and a free-body diagram for the following situation. Label each force acting on the trunk with its appropriate symbol: A trunk is on a level surface and being pulled to the right by a rope.
2K, 4C - take a picture and place a link to it in the box below.
2. Draw a free body diagram of a person riding in a car with and without a headrest. Draw the forces acting on a person and use Newton’s first law to justify this statement: headrests help prevent injury in rear-end collisions.
3K, 4C
3. Tommy is working on a physics problem and asks his friend Sarah to check his work. He is to draw a free-body diagram for a man walking to the left and comes up with the diagram below. He reasons, “The man is walking to the left, so the force of friction is acting in the opposite direction. The normal force should be opposite and equal to that of the gravitational force.”  Is Tommy correct with his diagram and reasoning? If so, explain. If not, what mistake did he make?
3K, 4C
4. Amy is giving a presentation to her class about Newton’s laws and makes the following statements: “Inertia is a property of matter that causes it to resist changes in motion. Heavier objects have more inertia because it takes more force to get them to move. Objects that are moving fast also have more inertia than objects that are moving slow, because it takes more force to stop a fast object than a slow object of the same mass.”  Is Amy’s analysis correct? If so, explain. If not, explain what mistake she made.
3K, 4C
Complete the table below: 5a
5A, 3T
5b.
5c.
5d.
5e.
5f.
5g.
5h.
6. A 75 kg skydiver jumps out of an airplane. Calculate the force of gravity acting on him when he jumps and after he has landed. Explain any differences.
2K, 3A, 2C
7. Four students are playing a game of tug-of-war. The two students on the right weigh 54 kg and 57 kg, and pull with a combined force of 140 N. The two students on the left weigh 53 kg and 55 kg and pull with a combined force of 120 N. Calculate the magnitude and direction of the acceleration of the students.
6A,3T
8. Some of the top drag racers in the world are able to reach speeds of 530 km/h over a distance of 400 m. Calculate the average force applied by the engine if the mass of a drag racer is 850 kg.
6A, 2T
9. Tanya jumps off of a raft to the left with a force of 120 N. Tanya has a mass of 62 kg, and the mass of the raft is 150 kg. What are the accelerations of both Tanya and the raft?
4A
10. In your own words, explain why the tension in a string must be uniform.
3T, 4C
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