AnswersWA-Physical Science BLab: Kinetic Energy

Lab: Kinetic Energy Answers

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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
91304
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Throughout the reflection, make sure you have a copy of the Student Guide and your data tables. Use the drop-down menus to complete the statements.

Answers:
In Part I, the independent variable was .:mass
In Part II, the independent variable changed to .:speed
The dependent variable for both Part I and Part II was .:kinetic energy
91305

timekinetic energy✔ speedmass

A
time
B
kinetic energy
C
✔ speed
D
mass
91306

time✔ kinetic energyspeedmass

A
time
B
✔ kinetic energy
C
speed
D
mass
91309

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
91310

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
91311

✔ 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
91312

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
91313

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
91314

✔ 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
91315

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
91316

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
91317

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
91318

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
91319

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.
91320

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

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