Energy Quiz II Review

On a roller coaster, at what point does the rider have the most potential energy?

• At the lowest point of the hill

• At the halfway point of a hill

• At the top of the hill

• When the ride is over

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NGSS.MS-PS3-2

Which of the following is an example of kinetic energy during the zipline ride?

• Standing still on the platform

• Slowing to a stop

• Gliding down the line

• Clipping into the harness

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As the rider descends down a ski hill, what happens to the potential energy?

• It stays the same

• It increases

• It converts into kinetic energy

• It turns into gravity

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NGSS.MS-PS3-2

If the rider's mass is 70 kg and the platform is 25 meters high, calculate their potential energy. Use the 4 step method!

• Potential energy = mass × gravity × height = 70 kg × 9.8 m/s² × 25 m = 17,150 J

• Potential energy = mass × gravity × height = 70 kg × 9.8 m/s² × 25 m = 1,750 J

• Potential energy = mass × gravity × height = 70 kg × 9.8 m/s² × 25 m = 19,250 J

• Potential energy = mass × gravity × height = 70 kg × 9.8 m/s² × 25 m = 15,750 J

During which time interval is the rider's kinetic energy increasing the most quickly?

• 0–2 seconds

• 5–7 seconds

• 2–4 seconds

• 8–10 seconds

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NGSS.MS-PS3-1

At approximately what time do the potential and kinetic energy lines intersect?

• Around 2 seconds

• Around 4 seconds

• Around 6 seconds

• Around 8 seconds

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NGSS.MS-PS3-1

What does the steady decrease in potential energy suggest about the rider's position on the zipline?

• The rider is climbing higher

• The rider is remaining still

• The rider is descending continuously

• The rider is speeding up and slowing down

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NGSS.MS-PS3-2

What transformation of energy occurs as the bungee jumper falls and then slows at the bottom of the jump?

• Thermal → potential

• Potential → kinetic

• Kinetic → sound → thermal

• Chemical → electromagnetic

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A zipline rider has a mass of 65 kg and starts from 30 meters high. Calculate the potential energy at the start of the ride. Use the 4 step method!

• Potential energy = mgh = 65 kg × 9.8 m/s² × 30 m = 19,110 J

• Potential energy = mgh = 65 kg × 9.8 m/s² × 30 m = 1,911 J

• Potential energy = mgh = 65 kg × 9.8 m/s² × 30 m = 19,911 J

• Potential energy = mgh = 65 kg × 9.8 m/s² × 30 m = 9,110 J

Some thrill-seekers say the bungee jump could be more exciting by increasing how fast they fall. Without pushing people off the platform, what could the park owners do to increase the speed of the fall?

• Use a thinner bungee cord

• Increase the height of the platform

• Add weights to the jumper

• Reduce the length of the bungee cord

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