What factors impact the kinetic energy of an object?(1 point)

Question

Responses

Weight and height
Weight and height

Weight and speed
Weight and speed

Mass and speed
Mass and speed

Mass and height

Answer 1

The factor that impacts the kinetic energy of an object is:

Mass and speed

Kinetic energy (KE) is given by the formula \( KE = \frac{1}{2} mv^2 \), where \( m \) is the mass of the object and \( v \) is its speed. Therefore, the correct response is:

Mass and speed

Answer 2

A student drops a ball three different times.


The table shows the ball’s kinetic energy upon hitting the ground from different heights.

The student claims that a ball dropped 3.0 meters would have fewer than 96 joules of kinetic energy upon hitting the ground. Is she correct? Why?

(1 point)
Responses

She is wrong. The higher the drop, the more kinetic energy the ball will have upon hitting the ground.
She is wrong. The higher the drop, the more kinetic energy the ball will have upon hitting the ground.

She is wrong. The higher the drop, the less kinetic the ball will have upon hitting the ground.
She is wrong. The higher the drop, the less kinetic the ball will have upon hitting the ground.

She is right! The higher the drop, the greater kinetic the ball will have upon hitting the ground.
She is right! The higher the drop, the greater kinetic the ball will have upon hitting the ground.

She is right! The higher the drop, the less kinetic energy the ball will have upon hitting the ground.

Answer 3

The student is incorrect in her claim. The correct response is:

She is wrong. The higher the drop, the more kinetic energy the ball will have upon hitting the ground.

As a ball is dropped from a greater height, it converts more potential energy into kinetic energy just before it hits the ground, resulting in a greater kinetic energy. Thus, a ball dropped from 3.0 meters will have more than 96 joules of kinetic energy upon impact, depending on the mass of the ball.

Answer 4

Where is the roller coaster’s kinetic energy highest?

(1 point)
Responses

A
A

B
B

C
C

D

Answer 5

In a roller coaster, the kinetic energy is highest at the lowest point of the track, where the speed of the coaster is greatest after descending from heights. Typically, this would be at point B if following a standard vertical drop configuration.

So, based on this context, the correct response would be:

B

Answer 6

On the ramp shown below, a student releases two identical objects at the same starting position. The student releases Object 1 first. The diagram below shows the positions of Objects 1 and 2 in motion.

Which has the highest kinetic energy?

(1 point)
Responses

Object 1
Object 1

Object 2
Object 2

Both objects have the same kinetic energy.
Both objects have the same kinetic energy.

Both objects have zero kinetic energy.

Answer 7

In a scenario where two identical objects are released from the same starting position on a ramp, both objects will convert their gravitational potential energy to kinetic energy as they move down the ramp.

If Object 1 has already started moving and is further down the ramp while Object 2 is still at the starting position, then Object 1 would have the highest kinetic energy.

However, if both objects are released at the same time and are moving down the ramp simultaneously, they would have the same kinetic energy at corresponding points of their descent, as they are identical and started from the same height.

Without additional information on their precise positions relative to each other, the safest assumption is:

Object 1 (if it is further along the ramp and moving faster).

If both are together on the ramp, then the correct response would be:

Both objects have the same kinetic energy.

Please choose the response based on the specific context provided in the question!

Answer 8

Kendra loves rolling down hills. She finds a steep hill to roll down. As she is rolling, when is her kinetic energy most likely the highest?(1 point)
Responses

at the bottom of the hill just as she has stopped rolling
at the bottom of the hill just as she has stopped rolling

at the bottom of the hill right before she stops rolling
at the bottom of the hill right before she stops rolling

just after the top of the hill right as she starts rolling down the hill
just after the top of the hill right as she starts rolling down the hill

at the top of the hill right before she has started rolling down the hill
at the top of the hill right before she has started rolling down the hill

Answer 9

Kendra's kinetic energy while rolling down the hill is highest at the bottom of the hill right before she stops rolling. At this point, she would be moving at the greatest speed, having converted potential energy to kinetic energy as she descended.

The correct response is:

at the bottom of the hill right before she stops rolling.

Answer 10

Two cars in motion have equal mass. Which car has more kinetic energy? (1 point)
Responses

the car with the greatest size
the car with the greatest size

the car with the greatest volume
the car with the greatest volume

the car with the greatest acceleration
the car with the greatest acceleration

the car with the greatest speed

Answer 11

The kinetic energy of an object is given by the formula \( KE = \frac{1}{2} mv^2 \), where \( m \) is the mass and \( v \) is the speed of the object. Since the mass is equal for both cars, the car with the greatest speed will have more kinetic energy.

The correct response is:

the car with the greatest speed.