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WorksheetsY10PT2W5HW2 Week 5 Summary Quizizz
Total questions: 25
Worksheet time: 50mins
What can you say about the potential energy of the two sleds shown above?
Sled B has more potential energy.
There is not enough information to know which sled has more potential energy.
The two sleds have the same potential energy.
Sled A has more potential energy.
Which of the following is a correct statement?
Both the mass and speed of an object affect the amount of kinetic energy it will have.
Only the speed of an object affects the amount of kinetic energy it will have.
Only the mass of an object affects the amount of kinetic energy it will have.
Neither the mass nor speed of an object affects the amount of kinetic energy; only the height of the object.
How could you increase the number of snowmen destroyed by the sled sliding down the hill?
Increase the starting kinetic energy of the sled.
Increase the mass of the sled.
all of the above
Increase the starting height of the sled.
A sled starts at rest with 51,450 J of potential energy. After traveling part of the way down the slope, the sled has 32,781 J of potential energy. If there is no friction, what is the kinetic energy of the sled?
18,669 J
51,450 J
84,231 J
32,781 J
energy cannot be created or destroyed, only transferred
Law of conservation of matter
Law of conservation of energy
Law of energy transfer
Law of the universe
the standard international unit for energy
newton
joule
kilogram
m/s/s
Which location has the least potential energy but the most kinetic energy.
W
X
Y
Z
What two factors affect GRAVITATIONAL POTENTIAL energy?
mass
height
speed
mass and speed
mass and height
Which has more GRAVITATIONAL POTENTIAL energy and WHY? (Choose the BEST explanation!)
A roller coaster car at the top of a hill
OR
a roller coaster car at the bottom of the hill.
The car at the top because it is not moving, so it has more potential energy.
The car at the top because it is higher off the ground, so it has more GPE.
The car at the bottom because it is going faster.
The car at the bottom because it can't go any lower.
What location on the coaster has the greatest potential energy
W
X
Y
Z
A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?
5%
50%
55%
100%
An iPhone charger coverts 75J of electricty in to 50J of charge and 25J of thermal energy. How efficient is the charger?
10%
100%
33%
67%
What is the unit for Power?
Joules
Volts
Watts
Amps
What is the equation for power?
TimeEnergy
EnergyWork
mass×gravity×height
Energy×Time
If Mr. P’s dog Ally has a mass of 50 kg and runs up a flight of stairs with a height of 10 meters in 2 seconds and Ms. Poteete’s dog Jasper has a mass of 25 kg and runs up the same flight of stairs in the same amount of time. Which dog has more power?
Jasper
Ally
Air Bud
Scout
How much useful energy is there in this Sankey diagram?
90 J
10 J
100 J
80 J
How much wasted energy is there in this Sankey diagram?
100 J
75 J
50 J
25 J
How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)
70 W
3.5 W
7 W
350 J
How much work is done using a 500-watt microwave oven for 1 minute? (Hint: Use seconds as the unit for time.)
30,000 J
500 J
8.3 J
0.12 J
A monkey weighing 50 N climbed a height of 3 m up a tree in 20 s.
Calculate power needed by the monkey
7.5 W
750 W
150 J
1500 J
Calculate the power needed by a washing machine when the work done is 120 kJ within 2 minutes.
60 W
60 kW
1 W
1 kW
