Which object has the greatest kinetic energy?(1 point)
Responses
a green car with a mass of 500kg moving at 21 m/s
a green car with a mass of 500kg moving at 21 m/s
a blue car with a mass of 500 kg moving at 30 m/s
a blue car with a mass of 500 kg moving at 30 m/s
a yellow car with a mass of 500 kg moving at 12 m/s
a yellow car with a mass of 500 kg moving at 12 m/s
a red car mass of 500 kg moving at 3 m/s
a blue car with a mass of 500 kg moving at 30 m/s
A skydiver jumps out of a plane and begins to accelerate. His speed increases to 20 m/s, then 30 m/s. His acceleration slows until he reaches a constant speed of 50 m/s. Which statement accurately describes his kinetic energy while falling?(1 point)
Responses
His kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.
His kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.
His kinetic energy increased while his speed increases, then it became constant.
His kinetic energy increased while his speed increases, then it became constant.
His kinetic energy would remain the same for the whole fall as long as he lost no mass.
His kinetic energy would remain the same for the whole fall as long as he lost no mass.
His kinetic energy increased quickly at first, then it increased at a constant rate.
His kinetic energy increased quickly at first, then it increased at a constant rate.
His kinetic energy increased while his speed increased, then it became constant.
Potential Energy of a System Quick Check
1 of 41 of 4 Items
Question
Use the picture to answer the question.
The girl in the picture is at the highest point in swinging and starts to come down. Which statement best describes the changes in energy as she begins to descend?
(1 point)
Responses
Kinetic energy is increasing, and potential energy is decreasing.
Kinetic energy is increasing, and potential energy is decreasing.
Kinetic and potential energy are decreasing.
Kinetic and potential energy are decreasing.
Kinetic and potential energy are increasing.
Kinetic and potential energy are increasing.
Potential energy is increasing, and kinetic energy is decreasing.
Potential energy is increasing, and kinetic energy is decreasing.
Kinetic energy is increasing, and potential energy is decreasing.
A person is riding a skateboard on a U-shaped ramp. At which point does the person have the greatest potential energy?(1 point)
Responses
at the top of the ramp before they begin moving down into the ramp
at the top of the ramp before they begin moving down into the ramp
in the middle of the ramp at its lowest point in the U
in the middle of the ramp at its lowest point in the U
on the first part of the ramp as the person is moving down the side
on the first part of the ramp as the person is moving down the side
on the other side of the ramp as the person is coming back up
at the top of the ramp before they begin moving down into the ramp
Use the picture to answer the question.
An illustration depicts a cyclist riding a bike along a hill. The end on the right where the cyclist moves upward is labeled C, the top of the hill is labeled B, and the end on the left where the cyclist moves downward is labeled A.
As the bicyclist rides from right to left, at which of the three points, if any, is the bicyclist’s potential energy increasing?
(1 point)
Responses
The potential energy is increasing at point C because the bicyclist is increasing in elevation at that point.
The potential energy is increasing at point C because the bicyclist is increasing in elevation at that point.
The potential energy is increasing at point B because the bicyclist is highest there.
The potential energy is increasing at point B because the bicyclist is highest there.
The potential energy is always decreasing because the bicyclist continues to move forward.
The potential energy is always decreasing because the bicyclist continues to move forward.
The potential energy is increasing at point A because the bicyclist is moving fastest at that point.
The potential energy is increasing at point C because the bicyclist is increasing in elevation at that point.
If a monkey drops a banana off of a cliff, where are the potential and kinetic energies of the banana equal?(1 point)
Responses
at the top
at the top
at the bottom
at the bottom
halfway down
halfway down
a quarter of the way down