Which best defines force?(1 point)
Responses
the ability to make an object change the way it moves
the ability to make an object change the way it moves
a push or a pull applied to an object
a push or a pull applied to an object
the energy stored in an object
the energy stored in an object
using energy to change an object's speed or height
using energy to change an object's speed or height
a push or a pull applied to an object
Which of the following is an example of an object with potential energy?(1 point)
Responses
a book sliding and coming to a rest on the floor
a book sliding and coming to a rest on the floor
a ball sitting at rest on the floor
a ball sitting at rest on the floor
a book sitting at rest up on a shelf
a book sitting at rest up on a shelf
a ball rolling across the floor at a certain speed
a book sitting at rest up on a shelf
A ball is rolling up a hill. What is happening to the ball's potential and kinetic energies?(1 point)
Responses
Its potential energy is increasing, and its kinetic energy is increasing.
Its potential energy is increasing, and its kinetic energy is increasing.
Its potential energy is increasing, and its kinetic energy is decreasing.
Its potential energy is increasing, and its kinetic energy is decreasing.
Its potential energy is decreasing, and its kinetic energy is decreasing.
Its potential energy is decreasing, and its kinetic energy is decreasing.
Its potential energy is decreasing, and its kinetic energy is increasing.
Its potential energy is decreasing, and its kinetic energy is increasing.
Its potential energy is increasing, and its kinetic energy is decreasing.
When an object falls into sand it leaves a crater behind. Explain how the size of the crater left behind is related to the energy of the falling object.(1 point)
Responses
Energy is required to move an object, but all falling objects fall at the same speed regardless of the height they started at; and therefore leave the same sized crater.
Energy is required to move an object, but all falling objects fall at the same speed regardless of the height they started at; and therefore leave the same sized crater.
The size of the crater will be large if the energy used to move the object is large. The size of the crater will be small if the energy used to move the object is small.
The size of the crater will be large if the energy used to move the object is large. The size of the crater will be small if the energy used to move the object is small.
A larger object will always have more energy when falling, so it will leave a bigger crater than a smaller object.
A larger object will always have more energy when falling, so it will leave a bigger crater than a smaller object.
The size of the crater will be large if the energy used to move the object is small. The size of the crater will be small if the energy used to move the object is large.
The size of the crater will be large if the energy used to move the object is small. The size of the crater will be small if the energy used to move the object is large.
The size of the crater will be large if the energy used to move the object is large. The size of the crater will be small if the energy used to move the object is small.
As a car travels down a ramp with no friction, its potential energy decreases. The potential energy is being(1 point)
Responses
lost to the surroundings.
lost to the surroundings.
converted into kinetic energy.
converted into kinetic energy.
destroyed.
destroyed.
transferred into the ramp.
transferred into the ramp.
converted into kinetic energy.
A car that is moving fast at the bottom of an uphill ramp moves up the ramp, slows down and stops just for an instant, and then begins to roll back down the ramp. At which point does the car have the most potential energy and why?(1 point)
Responses
At the point where the car is moving the fastest at the bottom of the ramp. This is because the faster an object is moving, the larger its potential energy.
At the point where the car is moving the fastest at the bottom of the ramp. This is because the faster an object is moving, the larger its potential energy.
At the point when the car is stopped. This is because its kinetic energy is zero at this point, which means all of its energy is in the form of potential energy.
At the point when the car is stopped. This is because its kinetic energy is zero at this point, which means all of its energy is in the form of potential energy.
At a point directly in the middle between the bottom and when the car stops. This is because this is the perfect balance point between kinetic energy and potential energy.
At a point directly in the middle between the bottom and when the car stops. This is because this is the perfect balance point between kinetic energy and potential energy.
The potential energy remains the same throughout. This is because energy is always conserved.
The potential energy remains the same throughout. This is because energy is always conserved.
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At the point when the car is stopped. This is because its kinetic energy is zero at this point, which means all of its energy is in the form of potential energy.
Is it possible for an object’s kinetic energy to suddenly decrease? If so, what can be said about the speed of the object?(1 point)
Responses
Yes, this is possible. This occurs when an object’s kinetic energy is suddenly transformed into speed, so it loses energy but gains speed.
Yes, this is possible. This occurs when an object’s kinetic energy is suddenly transformed into speed, so it loses energy but gains speed.
No, this is not possible. Energy cannot be destroyed.
No, this is not possible. Energy cannot be destroyed.
Yes, this is possible. This occurs during a collision, and the object’s energy is transferred into another object, slowing the object down.
Yes, this is possible. This occurs during a collision, and the object’s energy is transferred into another object, slowing the object down.
No, this is not possible. Energy can only increase, not decrease.
Yes, this is possible. This occurs during a collision, and the object’s energy is transferred into another object, slowing the object down.
When a Newton’s Cradle with three marbles is pulled back and released, a collision happens between the marbles causing a cycle of repeated motion. This transfer of energy will last for several cycles. In three to five sentences, list out all of the energy transfers that occur in one cycle.(4 points)
In one cycle of a Newton's Cradle with three marbles, the energy transfers occur as follows:
1. Initially, the potential energy is stored in the marbles when they are pulled back and raised to a certain height. This potential energy is converted into kinetic energy when they are released.
2. As the first marble collides with the second marble, some of the kinetic energy is transferred to the second marble. This transfer causes the first marble to come to a stop momentarily.
3. The second marble, now having gained kinetic energy, continues moving forward and collides with the third marble. Again, some of the kinetic energy is transferred to the third marble, causing the second marble to momentarily come to a stop.
4. Finally, the third marble, now having gained energy from both previous marbles, continues to move forward and reaches its maximum height, storing potential energy. The cycle then repeats as the third marble falls back down and collides with the second and first marble, transferring energy between the marbles.
Overall, the energy transfers in one cycle of the Newton's Cradle involve the conversion of potential energy into kinetic energy, and the transfers of kinetic energy between the marbles during the collisions.