T-bird Physics Test: Newton's 2nd Law And Horizontally Launched Projectiles
Please take this quiz to show how much you have learned in this unit. Please note: each multiple choice question is followed by a question asking you to explain your answer to the previous question. You must explain how you arrived at your answer; tell me what you know and how you figured out the answer and then I will understand better what you know and can do.
- 1.
The force required to accelerate a 2.0 kg mass at 4m/s2 is
- A.
6 N
- B.
2 N
- C.
8 N
- D.
16 N
Correct Answer
C. 8 NExplanation
The force required to accelerate a mass is given by the equation F = m * a, where F is the force, m is the mass, and a is the acceleration. In this case, the mass is 2.0 kg and the acceleration is 4 m/s^2. Plugging these values into the equation, we get F = 2.0 kg * 4 m/s^2 = 8 N. Therefore, the correct answer is 8 N.Rate this question:
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- 2.
Explain your thinking in question #1. Showing your work or setting up the problem will be fine.
- 3.
What force will be needed to accelerate an 8 kg mass at the same acceleration as a 4 kg mass?
- A.
The amount of force does not change
- B.
The force should double
- C.
It will take half as much force
- D.
The force needs to be 4x's as much
Correct Answer
B. The force should doubleExplanation
When two objects with different masses are accelerated at the same rate, the force required is directly proportional to the mass. In this case, the 8 kg mass is twice as heavy as the 4 kg mass. Therefore, according to Newton's second law of motion (F = ma), the force required to accelerate the 8 kg mass at the same acceleration as the 4 kg mass should be double.Rate this question:
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- 4.
Explain your thinking in question #3. Show your work or explain how you see the relationship between force, mass, and acceleration.
- 5.
A cart is uniformly accelerating from rest.The force on the cart must be
- A.
Decreasing
- B.
Zero
- C.
Constant
- D.
Increasing
Correct Answer
C. ConstantExplanation
When a cart is uniformly accelerating from rest, it means that it is experiencing a constant force. This is because according to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it. Since the cart is accelerating uniformly, the force acting on it must also be constant throughout its motion. Therefore, the correct answer is constant.Rate this question:
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- 6.
Explain your thinking in question #5. Show your work or explain how you see the relationship between force, mass, and acceleration.
- 7.
In the graph below, the acceleration of an object is plotted against the unbalanced force applied. What is the mass of the object?
- A.
0.5 kg
- B.
2 kg
- C.
4 kg
- D.
0.2 kg
Correct Answer
A. 0.5 kgExplanation
The mass of an object can be determined by dividing the unbalanced force applied to it by its acceleration. In this case, the graph shows that when the unbalanced force is 1 N, the acceleration is 2 m/s^2. By using the formula F = ma, we can rearrange it to solve for mass (m = F/a). Therefore, the mass of the object is 1 N / 2 m/s^2 = 0.5 kg.Rate this question:
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- 8.
Explain your thinking in question #7. Show your work or explain how you see the relationship between force, mass, and acceleration.
- 9.
Which of the following has no effect on how far the ball travels horizontally before it strikes the ground?
- A.
The mass of the ball
- B.
The height of the cliff
- C.
The speed with which the ball is thrown
Correct Answer
A. The mass of the ballExplanation
The mass of the ball does not have any effect on how far the ball travels horizontally before it strikes the ground. The horizontal distance traveled by a projectile is determined by the initial velocity and the time of flight, which are influenced by the speed with which the ball is thrown and the height of the cliff. The mass of the ball only affects its vertical motion and how quickly it falls to the ground, but it does not impact the horizontal distance it covers.Rate this question:
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- 10.
Explain why your answer to #9 is correct:
- 11.
Look at the diagram below of an arrow being shot horizontally from a bow and another being dropped from the same height. Arrow A is shot horizontally at 50 m/s. Arrow B is dropped at the exact same instant that Arrow A leaves the bow. Neglecting air resistance, how does the time Arrow A takes to hit the horizontal plane in the diagram compare with the time Arrow B takes to strike the same horizonatal plane?
- 12.
Use scientific language and your understanding of projectile motion to prove that a 100 mi/h pitch thrown horizontally by a major league player will hit the ground in the same amount of time as a 10 mi/h pitch thrown horizontally from the same height by a child.
- 13.
A ball is thrown horizontally at a speed of 20m/s from the top of a cliff. If the horizontal speed of the ball is decreased, the time required for the ball to fall 30m will
- A.
Decrease
- B.
Increase
- C.
Remain the same
Correct Answer
C. Remain the sameExplanation
When a ball is thrown horizontally, its vertical motion is solely determined by the force of gravity. Therefore, the time required for the ball to fall 30m will only depend on the vertical distance and the acceleration due to gravity, both of which remain constant. The horizontal speed of the ball does not affect its vertical motion or the time it takes to fall, so the time required for the ball to fall 30m will remain the same.Rate this question:
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- 14.
Explain how you know your answer to question #13 is correct:
- 15.
A ball is tossed straight up in an airplane traveling at a velocity of 500 mi/h due North in a straight line at a constant altitude. When the ball lands in the cabin its position relative to the person who tossed the ball will be
- A.
Farther toward the back of the cabin depending upon the plane’s speed
- B.
Farther toward the front of the cabin depending on the plane’s speed.
- C.
Right back down on the person who tossed it straight upward.
- D.
Farther toward the back of the plane if the ball is light, but farther toward the front if the ball is heavy
Correct Answer
C. Right back down on the person who tossed it straight upward.Explanation
When the ball is tossed straight up in an airplane traveling at a constant velocity, the ball will continue to move with that velocity in the same direction as the airplane. This is due to the principle of inertia, which states that an object in motion will remain in motion with the same velocity unless acted upon by an external force. Therefore, when the ball lands in the cabin, its position relative to the person who tossed it will be right back down on the person who tossed it straight upward.Rate this question:
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- 16.
Explain your answer in #15. How do you know your answer is correct?
.png "In the graph below, the acceleration of an object is plotted against the unbalanced force applied. What is the mass of the object?")
.png "Look at the diagram below of an arrow being shot horizontally from a bow and another being dropped from the same height. Arrow A is shot horizontally at 50 m/s. Arrow B is dropped at the exact same instant that Arrow A leaves the bow. Neglecting air resistance, how does the time Arrow A takes to hit the horizontal plane in the diagram compare with the time Arrow B takes to strike the same horizonatal plane?")
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Current Version
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Mar 21, 2023Quiz Edited by
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Apr 07, 2011Quiz Created by
Jan_parker
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