What is kinetic energy?
Kicking a soccer ball.
(1 point)
Responses
energy of motion
stored energy
energy from the sun
conserved energy
The correct answer is: energy of motion.
If you throw a ball up into the air, when will the ball have the greatest potential energy?
Throwing a ball into the air
(1 point)
Responses
when the ball is in motion and still rising
when the ball reaches its highest point and is motionless before it comes back down
when the ball is in motion and falling
when the ball hits the ground
The correct answer is: when the ball reaches its highest point and is motionless before it comes back down.
Two students drop different objects into sand from the same height. They record the depth of the hole made in the sand as results in the table below. What is the most likely explanation for the results?
A marble and bouncy ball are dropped into sand from the same height. The marble creates a hole in the sand with a depth of 1.0 cm. The bouncy ball creates a hole in the sand with a depth of 2.5 cm.
(1 point)
Responses
The object with the greater mass has the greater kinetic energy if dropped from the same height and will create a deeper hole in the sand.
The object with less mass has lower kinetic energy if dropped from the same height and will create a deeper hole in the sand.
The marble has the greatest mass and creates a deeper hole in the sand.
The bouncy ball and marble have the same mass and create the same size holes in the sand.
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The correct answer is: The object with the greater mass has the greater kinetic energy if dropped from the same height and will create a deeper hole in the sand.
A student wants to determine the effect of different masses on kinetic energy. The student will drop two balls of the same size into water. What method below would be the best way to test the effect of mass on kinetic energy?
Dropping two balls from the same height into water.
(1 point)
Responses
drop two balls with the same mass from the same height into water and observe the size of each splash
drop two balls with different masses from the same height into water and observe the size of each splash
drop two balls with different masses from different heights into water and observe the size of each splash
drop two balls with the same mass from different heights into water and observe the size of each splash
The best method to test the effect of mass on kinetic energy would be to drop two balls with different masses from the same height into water and observe the size of each splash.
Imagine the three objects below are dropped from the same height at the same time. Which object will result in the LEAST kinetic energy when it hits the ground? (Remember Kinetic Energy (KE) = 1/2 * m * v^2 where m = mass and v = velocity)
Object 1 = 10 grams
Object 2 = 200 grams
Object 3 = 1,000 grams
(1 point)
Responses
The object with a mass of 1000 grams will have the least kinetic energy when it hits the ground.
The object with a mass of 100 grams will have the least kinetic energy when it hits the ground.
The object with a mass of 10 grams will have the least kinetic energy when it hits the ground.
The objects will all have the same kinetic energy.
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The correct answer is: The object with a mass of 10 grams will have the least kinetic energy when it hits the ground.
Which statement about the roller coaster in the image below is true?
-Position A on the roller coaster is at the highest point.
-Position B on the roller coaster is below Position A as the car travels down the track.
-Position C on the roller coaster is located at the bottom right of the image.
-Position D on the roller coaster is located at the bottom left of the image at the lowest point.
(1 point)
Responses
There is maximum potential energy and minimum kinetic energy at position A on the roller coaster above.
The potential energy is greatest at position B on the roller coaster above.
There is no kinetic energy at positions C and D on the roller coaster above.
The potential energy and kinetic energy are the same at all positions on the roller coaster above.
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