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Physics 151 Practice Test II: Solutions for Chapters 2-3, Exams of Physics

A practice test for Physics 151, focusing on chapters 2-3. The test includes problems related to vehicle stopping distance, projectile motion, and motion under constant acceleration. Students are encouraged to draw diagrams and use given information to solve problems. The test covers concepts such as distance, time, velocity, acceleration, and trigonometry.

What you will learn

  • What is the maximum height a rock thrown at an angle of 37 degrees with an initial velocity of 25 m/s reaches?
  • What is the horizontal distance a banana travels when it is dropped from a tree and falls for 1 second?

Typology: Exams

2021/2022

Uploaded on 09/14/2022

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Physics 151 Practice Test II
(Chapters 2-3)
It may help to draw a picture if one is not provided.
In some of the problems, the solutions to earlier parts will be required to complete
later parts. However, if you cannot solve the earlier parts, you will receive full
credit if you write down what you would do with the information from the earlier
parts if you had it, i.e., if you write down an equation showing how the missing piece
of information could be used to find the answer to the part of the problem you’re
doing
1. You see a stalled vehicle and brake your car with an acceleration
of 5 m/s2 to stop and help. If your initial speed is 30 m/s,
a. what distance does the car travel before coming to a stop? (15)
b. How long does it take your car to stop? (15)
c. How far does your car travel in the last second before
stopping? (10)
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Download Physics 151 Practice Test II: Solutions for Chapters 2-3 and more Exams Physics in PDF only on Docsity!

Physics 151 Practice Test II

(Chapters 2-3)

It may help to draw a picture if one is not provided. In some of the problems, the solutions to earlier parts will be required to complete later parts. However, if you cannot solve the earlier parts, you will receive full credit if you write down what you would do with the information from the earlier parts if you had it, i.e., if you write down an equation showing how the missing piece of information could be used to find the answer to the part of the problem you’re doing

  1. You see a stalled vehicle and brake your car with an acceleration of 5 m/s^2 to stop and help. If your initial speed is 30 m/s, a. what distance does the car travel before coming to a stop? (15) b. How long does it take your car to stop? (15) c. How far does your car travel in the last second before stopping? (10)
  1. You throw a rock into the air from a height of 2 meters above the ground. The initial velocity of the rock is 25 m/s at an angle of 37 degrees above the horizontal. (Hint: cos(37) = 0.8, sin(37) = 0.6; 37 degrees is the smallest angle in a 3-4-5 triangle). Assuming the ground is level, find a. the maximum height to which the rock rises; (Remember that it starts 2 m above the ground). (10) b. the time it takes the rock to reach its maximum height; (10) c. the time it takes the rock to fall from its maximum height back to the ground; (10) d. the total time the rock is in the air; (5)

d. If the banana that breaks lose from the bunch takes 1 second to hit the ground (y = 0), how high is Carl’s tree (y 0 )? What horizontal distance does the rogue banana travel during this time? (10)

  1. A bomber is diving at an angle of 30 degrees below the horizontal when it releases its payload. The bomb is in the air for 10 seconds and strikes the ground 700 meters away (horizontally) from the release point. a. What is the x-component of the plane’s velocity? Given this result and the angle of the dive, what is the plane’s total initial velocity? What is the y-component of the initial velocity? (15) b. Taking the ground to be at y=0, find the height from which the bomb was dropped. (10)

c. Find the x and y components of the bomb’s velocity just before it hits the ground. Find the magnitude and direction of the bomb’s final velocity vector. (15)

  1. A teenager who didn’t get enough hugs as a child is up on a roof dropping and throwing rocks. He drops rock A, waits 1 second, and then simultaneously drops rock B from his left hand and throws rock C from his right hand with some downward initial velocity. a. Will the vertical separation distance of rocks A and B increase, decrease, or remain the same as they fall? Explain your reasoning. (10) b. Will the difference in the y-velocities of rocks A and B increase, decrease, or remain the same as they fall? Explain your reasoning. (10)

For constant acceleration:

(Example: g = 9.8 m/s^2 )

(Horizontal distance or Range when The Quadratic Equation Example: For ,