AnswersWA-Physical Science BLab: Kinetic Energy

Lab: Kinetic Energy Answers

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1
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Which is the correct equation for calculating the kinetic energy of an object?

A
[Image: K times E = m times g times h....]
Option A
B
[Image: K times E = one half m v squared....]
Option B
C
[Image: K times E = one half a t squared....]
Option C
D
[Image: K times E = one quarter g squared....]
Option D
2
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The concept of energy can be calculated in multiple ways. Which units are used for energy? Check all that apply.jouleskilogram meters2/seconds2newtonskilojoulesmeters/seconds2

A
joules
B
kilogram meters2/seconds2
C
newtons
D
kilojoules
E
meters/seconds2
3

Read through the scenarios below and calculate the predicted change in kinetic energy of the object compared to a50 kg ball traveling at 10 m/s.

Answers:
A 50 kg ball traveling at 20 m/s would have kinetic energy.:4 times more
A 50 kg ball traveling at 5 m/s would have kinetic energy.:4 times less
A 50 kg person falling at 10 m/s would have kinetic energy.:the same
4

Read through the scenarios below and calculate the predicted change in kinetic energy of the object compared to a 100 kg ball traveling at 5 m/s.

Answers:
A 1,000 kg ball traveling at 5 m/s would have kinetic energy.:10 times more
A 10 kg ball traveling at 5 m/s would have kinetic energy.:10 times less
A 100 kg person falling at 5 m/s would have kinetic energy.:the same
5

the same10 times more✔ 10 times less100 times more100 times less

A
the same
B
10 times more
C
✔ 10 times less
D
100 times more
E
100 times less
6

✔ the same10 times more10 times less100 times more100 times less

A
✔ the same
B
10 times more
C
10 times less
D
100 times more
E
100 times less
7

Read through the scenarios below and calculate the predicted change in kinetic energy of the object compared to a50 kg ball traveling at 10 m/s.

Answers:
A 50 kg ball traveling at 20 m/s would have kinetic energy.:4 times more
A 50 kg ball traveling at 5 m/s would have kinetic energy.:4 times less
A 50 kg person falling at 10 m/s would have kinetic energy.:the same
8

the same2 times more2 times less4 times more✔ 4 times less

A
the same
B
2 times more
C
2 times less
D
4 times more
E
✔ 4 times less
9

✔ the same2 times more2 times less4 times more4 times less

A
✔ the same
B
2 times more
C
2 times less
D
4 times more
E
4 times less
10

Which graph best represents the relationship between KE and mass?

A
[Image: A graph with vertical axis K E and horizontal axis...]
Option A
B
[Image: A graph with vertical axis K E and horizontal axis...]
Option B
C
[Image: A graph with vertical axis K E and horizontal axis...]
Option C
D
[Image: A graph with vertical axis K E and horizontal axis...]
Option D
11

Which graph best represents the relationship between KE and speed?

A
[Image: A graph with vertical axis K E and horizontal axis...]
Option A
B
[Image: A graph with vertical axis K E and horizontal axis...]
Option B
C
[Image: A graph with vertical axis K E and horizontal axis...]
Option C
D
[Image: A graph with vertical axis K E and horizontal axis...]
Option D
12

Which factors could be potential sources of error in the experiment? Check all that apply.energy lost in the lever due to frictioncolor of the soda bottle used in the experimentvisual estimation of height of the beanbagtemperature of the lab at the time of the experimentposition of the fulcrum for the lever affecting transfer of energy

A
energy lost in the lever due to friction
B
color of the soda bottle used in the experiment
C
visual estimation of height of the beanbag
D
temperature of the lab at the time of the experiment
E
position of the fulcrum for the lever affecting transfer of energy
13

If you repeated this experiment, which options could lead to more precise results? Check all that apply.Increase the drop heights from the top of a building, using the same lever.Use a video camera to record the height of each beanbag with greater accuracy.Use a pressure sensor to record the force of the soda bottle more accurately.Increase the number of trials for each experiment by a factor of three.Increase efficiency by examining mass and speed at the same time in the same trial.Throw the bottle at the lever as hard as you can, instead of dropping it, to create maximum KE.

A
Increase the drop heights from the top of a building, using the same lever.
B
Use a video camera to record the height of each beanbag with greater accuracy.
C
Use a pressure sensor to record the force of the soda bottle more accurately.
D
Increase the number of trials for each experiment by a factor of three.
E
Increase efficiency by examining mass and speed at the same time in the same trial.
F
Throw the bottle at the lever as hard as you can, instead of dropping it, to create maximum KE.

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