What is one way to decrease the kinetic energy of an object?(1 point)

Question

Responses

Decrease its volume.
Decrease its volume.

Decrease its speed.
Decrease its speed.

Increase its mass.
Increase its mass.

Increase its weight.

Answer 1

The correct response to decrease the kinetic energy of an object is:

Decrease its speed.

Kinetic energy is given by the formula \( KE = \frac{1}{2} mv^2 \), where \( m \) is the mass and \( v \) is the speed of the object. If you decrease the speed, the kinetic energy will decrease.

Answer 2

Two objects are moving at the same speed. Which one has more kinetic energy?(1 point)
Responses

the object with the greater volume
the object with the greater volume

the object that is higher above ground level
the object that is higher above ground level

the object with the greater mass
the object with the greater mass

the object that is made of more dense material
the object that is made of more dense material
Remaining Attempts : 3

Answer 3

The correct response is:

the object with the greater mass.

Kinetic energy is calculated using the formula \( KE = \frac{1}{2} mv^2 \). Since both objects are moving at the same speed, the one with the greater mass will have more kinetic energy.

Answer 4

Three identical cars are driving along the highway when they come to a traffic jam. Car A gets stopped at the bottom of a hill. Car B stops half way down the hill. Car C is stopped at the top of the hill. Which car has the greatest potential energy and why?(1 point)
Responses

Car C has the most potential energy because potential energy increases with height and it is at the top of the hill.
Car C has the most potential energy because potential energy increases with height and it is at the top of the hill.

All of the cars have the same potential enegy because they are all affected by gravity in the same way.
All of the cars have the same potential enegy because they are all affected by gravity in the same way.

Car A has the most potential energy because it is already at the bottom of the hill and will have less distance to drive when the traffic jam clears.
Car A has the most potential energy because it is already at the bottom of the hill and will have less distance to drive when the traffic jam clears.

Car B has the most potential energy because being half way down the hill gives it an equal balance of kinetic and potential energy.

Answer 5

The correct response is:

Car C has the most potential energy because potential energy increases with height and it is at the top of the hill.

Potential energy is calculated using the formula \( PE = mgh \), where \( m \) is the mass, \( g \) is the acceleration due to gravity, and \( h \) is the height. Since Car C is at the highest point, it has the greatest potential energy.

Answer 6

A 16-pound bowling ball strikes a 3.5-pound bowling pin. The pin is moving very fast after the collision. It has a large increase in velocity as a large amount of kinetic energy is transferred to it. Where does the energy come from?(1 point)
Responses

The bowling pin gets its energy from the bowling ball hitting it.
The bowling pin gets its energy from the bowling ball hitting it.

The bowling pin gets the energy to move from the air around it.
The bowling pin gets the energy to move from the air around it.

The bowling pin gets its energy to move from the rotation of the earth.
The bowling pin gets its energy to move from the rotation of the earth.

The bowling pin has stored energy in it which automatically activates to help it move.

Answer 7

The correct response is:

The bowling pin gets its energy from the bowling ball hitting it.

In a collision, the kinetic energy transferred from the bowling ball (the larger mass moving at a certain speed) to the bowling pin (the smaller mass) causes the pin to accelerate and move, increasing its velocity.

Answer 8

A mother and her small child are standing in an inflatable bouncy house on opposite sides. The mother jumps up and comes back down again, transferring her kinetic energy to the child through the floor. How will the motion of the small child change?(1 point)
Responses

The child will move up at a faster speed because the child has less mass.
The child will move up at a faster speed because the child has less mass.

The child will move up at the same speed at which the mother came down.
The child will move up at the same speed at which the mother came down.

The child will move down at the same speed at which the mother came down.
The child will move down at the same speed at which the mother came down.

The child will move up at a slower speed because the child has less mass.

Answer 9

The correct response is:

The child will move up at the same speed at which the mother came down.

When the mother jumps and lands in the bouncy house, she compresses the surface, which then pushes back against the child on the other side. The motion of the child will be a response to this force, resulting in the child moving upwards. The speed of the child's upward motion will be influenced by the mother's downward motion, but the relationship between them isn't directly based on mass; instead, the energy transfer is what determines the speed.

Answer 10

Water moves through a hydroelectric dam. Which statement describes the changes in energy that occur? (1 point)
Responses

Energy changes from potential to kinetic to electric.
Energy changes from potential to kinetic to electric.

Energy changes from kinetic to electric to potential.
Energy changes from kinetic to electric to potential.

Energy changes from kinetic to potential to electric.
Energy changes from kinetic to potential to electric.

Energy changes from potential to electric to kinetic.

Answer 11

The correct response is:

Energy changes from potential to kinetic to electric.

In a hydroelectric dam, water is stored at a height, giving it potential energy. As the water flows down through the dam, that potential energy is converted to kinetic energy. Finally, as the kinetic energy of the moving water turns turbines, it is transformed into electric energy.