CFA: Kinetic Energy

What is the formula for calculating kinetic energy?

• KE = m * v

• KE = m * v^2

• KE = 1/2 * m * v^2

• KE = 1/2 * m * v

Tags

NGSS.HS-PS3-1

Which of the following factors affect the kinetic energy of an object?

• density and temperature

• color and shape

• volume and pressure

• mass and velocity

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What are the units of kinetic energy?

• Meters per second (m/s)

• Joules (J) or foot-pounds (ft-lb)

• Watts (W)

• Hertz (Hz)

Tags

NGSS.HS-PS3-2

A car is traveling at a speed of 60 km/h. What is its kinetic energy if its mass is 500 kg?

• 10000 J

• 3000 J

• 2000 J

• 5000 J

Tags

NGSS.HS-PS3-1

True or False: Kinetic energy depends on the direction of motion.

• False

• True

• Kinetic energy depends on speed, not direction

• Kinetic energy depends on mass, not direction

What happens to the kinetic energy of an object if its mass is doubled?

• The kinetic energy of the object will double.

• The kinetic energy of the object will decrease by half.

• The kinetic energy of the object will halve.

• The kinetic energy of the object will remain the same.

What happens to the kinetic energy of an object if its velocity is halved?

• The kinetic energy of the object will be reduced to half of its original value.

• The kinetic energy of the object will be reduced to one-fourth of its original value.

• The kinetic energy of the object will be doubled.

• The kinetic energy of the object will remain the same.

A ball is rolling down a hill. Which has more kinetic energy, the ball at the top of the hill or the ball at the bottom?

• bottom

• neither

• top

• they have the same kinetic energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is the kinetic energy of a 2 kg object moving at a velocity of 10 m/s?

• 20 J

• 5 J

• 100 J

• 50 J

Tags

NGSS.HS-PS3-1

What is the relationship between kinetic energy and potential energy?

• Kinetic energy and potential energy are completely unrelated.

• Potential energy can only be converted into thermal energy.

• Kinetic energy can only be converted into potential energy.

• Potential energy can be converted into kinetic energy and vice versa.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-3