A stone is thrown straight up. When it reaches it's highest point,

it's velocity is zero and it's acceleration is not zero

both it's velocity and it's acceleration are zero

it's velocity is not zero and it's acceleration is zero

neither it's velocity nor it's acceleration is zero

What Do You Know About Free Fall? Trivia Quiz

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Dhotz

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Quizzes Created: 2 | Total Attempts: 5,159

Questions: 5 | Attempts: 5,046 | Updated: Mar 22, 2023

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What Do You Know About Free Fall? Trivia Quiz - Quiz

What Do You Know About Free Fall? If you are a thrill-seeker, free fall is something you should check out. Not only do you get to fall from high places and feel the cold air on your cheeks, but you also get your adrenaline pumping. Do you know some of the safety measures when attempting a free fall? Take the quiz and see what you can learn about it.

Questions and Answers

1.

A stone is thrown straight up. What is it's acceleration on the way up?
- A.
  
  +9.8 m/s2
- B.
  
  -9.8 m/s2
Correct Answer
B. -9.8 m/s2

Explanation
When the stone is thrown straight up, it experiences a deceleration due to the force of gravity pulling it downward. The acceleration due to gravity is always directed towards the center of the Earth, so when the stone is moving upwards, the acceleration is opposite in direction to its motion. Therefore, the acceleration on the way up is -9.8 m/s2.

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2.

A stone is thrown straight up. When it reaches it's highest point,
- A.
  
  Both it's velocity and it's acceleration are zero
- B.
  
  It's velocity is zero and it's acceleration is not zero
- C.
  
  It's velocity is not zero and it's acceleration is zero
- D.
  
  Neither it's velocity nor it's acceleration is zero
Correct Answer
B. It's velocity is zero and it's acceleration is not zero

Explanation
When the stone reaches its highest point, its velocity is zero because it has stopped moving momentarily. However, its acceleration is not zero because gravity is still acting on the stone, pulling it downward. The stone is undergoing negative acceleration due to gravity, causing it to slow down and eventually reverse direction. Therefore, the correct answer is "its velocity is zero and its acceleration is not zero."

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3.

An object is thrown upwards with a speed of 14 m/s. How high above the projection point does it reach?
- A.
  
  5.0 m
- B.
  
  10 m
- C.
  
  15 m
- D.
  
  20 m
- E.
  
  25 m
Correct Answer
B. 10 m

Explanation
When an object is thrown upwards, its initial velocity is positive and it experiences a constant acceleration due to gravity in the opposite direction. As a result, the object slows down until it reaches its highest point and then starts to fall back down. The time it takes to reach the highest point is the same as the time it takes to fall back down to the projection point. Using the equation of motion, we can calculate the time it takes to reach the highest point. Using this time, we can then calculate the height reached using the equation of motion for displacement. In this case, the object reaches a height of 10 m above the projection point.

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3
4.

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge?
- A.
  
  10 m
- B.
  
  14 m
- C.
  
  26 m
- D.
  
  32 m
- E.
  
  52 m
Correct Answer
C. 26 m

Explanation
The height of the bridge can be determined using the equation of motion for free fall: h = 1/2 * g * t^2, where h is the height, g is the acceleration due to gravity, and t is the time. Plugging in the given values, we get h = 1/2 * 9.8 m/s^2 * (2.3 s)^2 = 26.285 m. Since the height cannot be measured with such precision, it is rounded to the nearest meter, which is 26 m.

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5.

An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2. To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If the time is 6.3 s, what is the depth of the crater?
- A.
  
  10 m
- B.
  
  14 m
- C.
  
  26 m
- D.
  
  32 m
- E.
  
  38 m
Correct Answer
D. 32 m

Explanation
The depth of the crater can be determined using the equation of motion for free fall: d = 1/2 * g * t^2, where d is the depth, g is the acceleration due to gravity, and t is the time. Plugging in the given values, we have d = 1/2 * 1.62 m/s^2 * (6.3 s)^2 = 32 m.

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7
1

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Current Version
Mar 22, 2023

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Sep 20, 2010

Quiz Created by
Dhotz

What Do You Know About Free Fall? Trivia Quiz

A stone is thrown straight up. What is it's acceleration on the way up?

A stone is thrown straight up. When it reaches it's highest point,

An object is thrown upwards with a speed of 14 m/s. How high above the projection point does it reach?

To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge?

An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2. To determine the depth of the crater, she drops a rock and measures the time it takes for it to hit the bottom. If the time is 6.3 s, what is the depth of the crater?