Question

Question 20


A 45 kg baby brown bear climbs 12 meters up a tree to see if he can spot the best blueberry patch in the valley. What is the brown bear's potential energy?

a
2,646 J
b
5,292 J
c
10,584 J
d
63,504 J
Question 21
Ms. Avari is lifting 65 kg weights in kettle bell class. She needs to swing the kettle bell over her head, a total of 2 meters off the ground. What potential energy do the weight when Ms. Avari is holding it over her head?

a
520 J
b
637.65 J
c
2,550.6 J
d
130 J
e
260 J
f
1275.3 J
Question 22
Order the points on the image from lowest to highest potential energy.



Reorder answers
1.Point C
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2.Point D
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3.Point B
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4.Point A
Question 23
Order the points on the image from lowest to highest kinetic energy.



Reorder answers
1.Point A
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2.Point C
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3.Point D
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4.Point B
Question 24
Which of the following would increase an object's kinetic energy the most?

a
decreasing the velocity of the object
b
increasing the velocity of the object
c
increasing the mass of the object
d
decreasing the mass of the object


Please read: The following questions are review questions from Units 2 and 3. Remember, your tests are cumulative so you will see material from previous units on all tests.

Question 25
What are the two factors that affect the force of gravity between two objects?

a
Mass and matter
b
Weight and mass
c
Distance and mass
d
Distance and weight
Question 26
If a person has a mass of 50 kg, what is the mass of the person on the moon?

Acceleration due to Gravity

Earth: a = 9.8 m/s2

Moon: a = 1.6 m/s2

Mars: a = 3.7 m/s2



a
50 N
b
80 N
c
185 N
d
490 N
Question 27
If a person has a mass of 50 kg, order the places from where you would be least to greatest weight.

Acceleration due to Gravity

Earth: a = 9.8 m/s2

Moon: a = 1.6 m/s2

Mars: a = 3.7 m/s2

Jupiter: a = 24.5 m/s2



Reorder answers
1.Earth
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2.Moon
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3.Jupiter
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4.Mars

Answer 1

Question 20
PE = mgh = 45 kg × 9.8 m/s² × 12 m = 5,292 J → b

Question 21
PE = mgh = 65 kg × 9.81 m/s² × 2 m ≈ 1,275.3 J → f

Question 22
Lowest to highest potential energy: C, D, B, A

Question 23
Lowest to highest kinetic energy: A, C, D, B

Question 24
Increasing the velocity of the object (velocity has a squared effect in KE = 1/2 mv²) → b

Question 25
The two factors: distance and mass → c

Question 26
They mean weight on the Moon: weight = mg = 50 kg × 1.6 m/s² = 80 N → b
(Note: mass remains 50 kg, weight changes with gravity.)

Question 27
Least to greatest weight: Moon, Mars, Earth, Jupiter