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Dec 6, 2023

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4.4.3 Test (TST): Teacher-Scored Unit Test Test Physics Sem 1 Points Possible: 50 Name: Hudson Kohler Date: In this test you will apply what you have learned in the unit. Please answer the questions below. Submit this to your teacher when you are done. Show all your work on this test. Question 1 (2 points) You are in a spaceship far outside our solar system. Inside your spaceship there is no gravity and no air (and therefore no air resistance). If you toss a ball across the spaceship, how do Newton’s laws predict its motion will change as it moves? (2 points)
Newtons first law says that the ball will continue without stopping. According to his second law, if you apply fore to the ball it will accelerate and change direction based on the force applied. Question 2 (4 points) You are in a gym. A basketball sits on a rack next to you while you punch a punching bag. Name two action-reaction pairs that are present in this situation. (4 points) When you exert force into the punching bag, the bag swings back, returning the force. The force of gravity is pulling the ball down, while the rack pushed back up while holding the ball. Question 3 (8 points)
Your go-cart breaks down right before the end of a race, so you have to push it over the finish line. The go-cart has a mass of 85 kg. a. What is the weight of your go-cart? (2 points) The weight of the go-cart is 833 N. b. How much force must you apply to give the go-cart an acceleration of 0.9 m/s 2 ? (2 points) You must apply 76.5 N of force. c. If you push with a force of 350 N, what is the acceleration of the cart? (2 points) 350/85=4.12 m/s^2
d. Later, you are driving your friend's go-cart. If his cart has an acceleration of 5.5 m/s 2 and the cart's engine is applying a forward force of 720 N, what is the mass of his go-cart? (2 points) 720/5.5= 130.91 kg Question 4 (2 points) You have a ball with mass 2.8 kg tied to a rope, and you spin it in a circle of radius 1.3 m. If the ball is moving at a speed of 7 m/s, what is the centripetal force acting on the ball? (2 points) mv 2 /r= 2.8*7 2 /1.3 = 105 N Question 5 (13 points)
Trent and Dyson pull on opposite sides of a shopping cart that has a mass of 13 kg. Trent pulls the cart to the right with a force of 85 N, and Dyson pulls the cart to the left with a force of 96 N. (Assume there is no friction.) a. Draw the free-body diagram of the shopping cart. (You do not need to draw it perfectly to scale. Just make sure the directions are correct.) (3 points) b. Write the expression for the net force on the shopping cart along the y -axis. (2 points) F net =N-mg=0 c. Write the expression for the net force on the shopping cart along the x -axis. (2 points)
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