Midterm Review Packet

# E what is the objects velocity at 2 s f what is the

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e) What is the objects velocity at 2 s? f) What is the objects displacement from 3 seconds to 5 seconds (show work for this one)? g) If the mass of the object in the graph is 10kg, what force acts of the mass from 5 to 7 seconds?

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Position vs. Time -5 0 5 10 15 20 25 0 2 4 6 8 10 12 14 16 Time (s) Position (m) 9) Below is a POSITION VS. TIME graph. Answer the following question based on the graph. a) During what time interval(s) is the velocity zero? b) During what time interval is the overall speed the greatest? c) During what time interval is the velocity the most negative? d) What is the speed at t=2s? e) During what time interval does the object travel the greatest distance? 2-D MOTION (Projectiles) 10) A cannon is sitting on top of a 75m cliff. It shoots a cannon ball with an initial velocity of 60m/s at an angle of 50°. Find all of the following information: x-component of velocity = ? 38.57m/s y-component of velocity = ? 45.96m/s Δd(y) = ? -75m Δt = ? 10.79s Δd(x) = ? 416.17m 11) A girl hits a golf ball off a hill at an angle of 40°. This hill is 40m high and it takes 6 seconds for the ball to hit the ground. What is the initial velocity of the ball? 35.37m/s 12) At a circus, an acrobat wishes to shoot himself from a cannon through a free hanging hoop. The cannon can shoot the acrobat with an initial velocity of 30m/s at and angle of 60°. If the cannon is 4m off the ground and the hoop is 20 meters above the ground, how far in the x axis should the hoop be placed from the cannon? 10.6m or 68.85m 13) A car drives off a cliff (horizontally) with a speed of 40m/s. It takes 4s for the car to hit the ground. What are the horizontal distance traveled, the height of the cliff, the final overall velocity when it hits the ground, and angle at which it hits the ground? 160m, 78.4m, 56m/s @ 315.58° NEWTON’S LAWS, FRICTION, INCLINES : 14) Alfred Odegard, a skilled farmer who survived the dust bowl days on his North Dakota farm, pushed with a horizontal force of 125N his 500kg wagon along a level icy surface (little friction). (a) Determine the acceleration of the wagon. (b) If the wagon started at rest, how fast was it moving after being pushed for a time interval of 5s? 0.25m/s 2 , 1.25m/s 15) You stand on a bathroom scale and it reads 686N (70kg) (a) Now, you place the scale in an elevator and stand on it. What does it read at the beginning of the ride when the elevator accelerates up at 2m/s 2 ? (b) What does the scale read when the elevator continues to move up at a constant speed of 2m/s? (c) What does it read at the end of the ride when the elevator slows down at a rate of magnitude 2m/s 2 ? 826N, 686N, 546N 16) 80kg downhill skier Bode Miller descends a slope inclined at 20 o . Determine his acceleration if the coefficient of friction is 0.10. What is the acceleration of the skier = 2.43m/s 2 If the skier starts from rest, how long will it take to travel 100 m downhill = 9.07s What will the final velocity of the skier be = 22.04m/s
60kg 37 ° 55 ° 17) You’re pulling your 15kg dog in a sled across the snow with a 35N force at a 40 o angle above the ground.

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