Kinetic Energy

Question 1

What is the formula for calculating kinetic energy?
A. KE = mgh
B. KE = 1/2 mv^2
C. KE = P/t
D. KE = Fd

Answer 1

B. KE = 1/2 mv^2

Question 1

Which of the following is a unit of kinetic energy?
A. Joules
B. Newton
C. Watts
D. Kilograms

Answer 1

A. Joules

Question 2

Which variable in the kinetic energy formula represents mass?
A. K
B. v
C. m
D. h

Answer 2

C. m

Question 3

Which of the following will increase an object’s kinetic energy?
A. Decreasing its mass
B. Decreasing its velocity
C. Increasing its mass
D. Increasing its potential energy

Answer 3

C. Increasing its mass

Question 4

If the velocity of an object doubles, how does its kinetic energy change?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Increases by a factor of 6
D. Increases by a factor of 8

Answer 4

B. Increases by a factor of 4

Question 5

Which of the following factors does NOT affect the kinetic energy of an object?
A. Mass
B. Velocity
C. Height
D. Acceleration

Answer 5

C. Height

Question 6

Which conversion factor is used to convert kinetic energy from joules to electronvolts?
A. 1 eV = 1 J
B. 1 eV = 2 J
C. 1 eV = 3 J
D. 1 eV = 4 J

Answer 6

A. 1 eV = 1 J

Question 7

What happens to an object’s kinetic energy when it comes to a complete stop?
A. It remains the same
B. It increases
C. It decreases
D. It becomes potential energy

Answer 7

C. It decreases

Question 8

Which of the following determines the maximum kinetic energy of an object?
A. Acceleration
B. Displacement
C. Initial velocity
D. Final velocity

Answer 8

D. Final velocity

Question 9

If an object’s mass is doubled and its velocity remains constant, how does its kinetic energy change?
A. Doubles
B. Quadruples
C. Halves
D. Stays the same

Answer 9

A. Doubles

Question 10

. Which of the following is NOT a form of kinetic energy?
A. Thermal
B. Sound
C. Chemical
D. Magnetic

Answer 10

C. Chemical

Question 11

At what point in its motion does an object have the highest kinetic energy?
A. At rest
B. Halfway between two points
C. At the point of maximum velocity
D. At the point of maximum acceleration

Answer 11

C. At the point of maximum velocity

Question 12

A 2.00kg carton of milk is falling at 2.50m/s. Calculate its kinetic energy

Answer 12

KE = 1/2 mv^2
KE = 1/2 x 2.00 x 2.5^2
KE = 6.25J

Question 13

A 4.50kg rolling skateboard has a kinetic energy of 32.0J. How fast is it going?

Answer 13

KE = 1/2 mv^2
32 = 1/2 x 4.5 x v^2
32 / 2.25 = v^2
14.2 = v^2
v = 3.77 m/s

Question 14

How much force will it take if you wish to stop a 930kg car going at 14.5m/s in a distance of 23.0m?

Answer 14

KE = 1/2 mv^2
KE = 1/2 x 930 x 14.5^2
KE = 97,800 J

Energy transferred = force x distance
97,800 J = F x 23.0m
F = 97,800 / 23
F = 4250 N