Question
Question 19
Ellen drops a ball from a cliff. Which statement best describes the ball's energy as it falls from her hand?
a
The ball's potential energy decreases while its kinetic energy increases.
b
The ball's potential energy is changed to thermal energy.
c
The ball's kinetic energy decreases while its potential energy increases.
d
The ball's kinetic energy increases but its potential energy remains the same.
Question 20
Mrs. Wilson is driving her car to the store. She drives on a street where the speed limit is 50 mph. Then she turns onto a street where the speed limit is 45 mph. What happens to the kinetic energy of her car?
a
When she slows from 45 mph to 50 mph, the car’s kinetic energy decreases.
b
When she slows from 50 mph to 45 mph, the car’s kinetic energy increases.
c
When she slows from 50 mph to 45 mph, the car’s kinetic energy stays the same.
d
When she speeds up from 45 mph to 50 mph, the car’s kinetic energy is changed to potential energy.
Question 21
Which object has kinetic energy?
a
a bird perched in a tree
b
a ball sitting under a table
c
a person standing at the top of stairs
d
a person running on the sidewalk
Question 22
Which object has potential energy?
a
a person walking down the street
b
a soccer ball rolling across a field
c
a car moving down the interstate
d
an acorn sitting on top of a roof
Ellen drops a ball from a cliff. Which statement best describes the ball's energy as it falls from her hand?
a
The ball's potential energy decreases while its kinetic energy increases.
b
The ball's potential energy is changed to thermal energy.
c
The ball's kinetic energy decreases while its potential energy increases.
d
The ball's kinetic energy increases but its potential energy remains the same.
Question 20
Mrs. Wilson is driving her car to the store. She drives on a street where the speed limit is 50 mph. Then she turns onto a street where the speed limit is 45 mph. What happens to the kinetic energy of her car?
a
When she slows from 45 mph to 50 mph, the car’s kinetic energy decreases.
b
When she slows from 50 mph to 45 mph, the car’s kinetic energy increases.
c
When she slows from 50 mph to 45 mph, the car’s kinetic energy stays the same.
d
When she speeds up from 45 mph to 50 mph, the car’s kinetic energy is changed to potential energy.
Question 21
Which object has kinetic energy?
a
a bird perched in a tree
b
a ball sitting under a table
c
a person standing at the top of stairs
d
a person running on the sidewalk
Question 22
Which object has potential energy?
a
a person walking down the street
b
a soccer ball rolling across a field
c
a car moving down the interstate
d
an acorn sitting on top of a roof
Answers
GPT-4o mini
Here are the answers to your questions:
**Question 19:**
The correct answer is **a**: The ball's potential energy decreases while its kinetic energy increases.
As the ball falls, it loses height, which decreases its gravitational potential energy, while its speed increases, resulting in an increase in kinetic energy.
**Question 20:**
The correct answer is **a**: When she slows from 45 mph to 50 mph, the car’s kinetic energy decreases.
Kinetic energy is proportional to the square of the speed (KE = 1/2 mv²). When the speed decreases from 50 mph to 45 mph, the kinetic energy decreases.
**Question 21:**
The correct answer is **d**: a person running on the sidewalk.
Kinetic energy is the energy of motion, and a person running is in motion.
**Question 22:**
The correct answer is **d**: an acorn sitting on top of a roof.
Potential energy is stored energy based on position, and the acorn has potential energy because it is elevated above the ground.
**Question 19:**
The correct answer is **a**: The ball's potential energy decreases while its kinetic energy increases.
As the ball falls, it loses height, which decreases its gravitational potential energy, while its speed increases, resulting in an increase in kinetic energy.
**Question 20:**
The correct answer is **a**: When she slows from 45 mph to 50 mph, the car’s kinetic energy decreases.
Kinetic energy is proportional to the square of the speed (KE = 1/2 mv²). When the speed decreases from 50 mph to 45 mph, the kinetic energy decreases.
**Question 21:**
The correct answer is **d**: a person running on the sidewalk.
Kinetic energy is the energy of motion, and a person running is in motion.
**Question 22:**
The correct answer is **d**: an acorn sitting on top of a roof.
Potential energy is stored energy based on position, and the acorn has potential energy because it is elevated above the ground.