Calculating Kinetic Energy

An object slows down to 1/3 of it's original velocity, what happens to the kinetic energy?

• stays the same

• decreases by factor 3

• increases by factor 3

• decreases by factor 9

KE = 1/2 m s²

A 10 gram ball is rolling at 3 m/s. The ball has __________ energy. Calculate it.

• 30 joules

• 60 joules

• 45 joules

• 15 joules

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

You serve a volleyball with a mass of 2100 g. The ball leaves your hand with a velocity of 30 m/s. The ball has ____________ energy. Calculate it.

• 2,400 joules

• 630,000 joules

• 63,000 joules

• 945,000 joules

Tags

NGSS.HS-PS3-1

KE = 1/2 m s²

A toy car is traveling with a velocity of 4 m/s and has a mass of 1120 g. The car has ___________energy. Calculate it.

• 564 joules

• 8,960 joules

• 63,000 joules

• 896 joules

Tags

NGSS.MS-PS3-1

What is the kinetic energy of a 30 gram ball that is rolling at a speed of 2 meters per second?

• 60 joules

• 32 joules

• 1,200 joules

• 120 joules

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has __________________ energy. Calculate it.

• 945 joules

• 63 joules

• 126 joules

• 1,890 joules

Tags

NGSS.HS-PS3-1

Calculate the KE of a car that has a mass of 1000 kg and is moving at the rate of 20 m/s.

• 2,000 joules

• 200,000 joules

• 40,000 joules

• 20,000 joules

Tags

NGSS.HS-PS3-2

What is the KE of a soccer ball which has a mass of 0.8 kg and is kicked at a velocity of 10 m/s?

• 16 joules

• 8 joules

• 40 joules

• 10.8 joules

Tags

NGSS.MS-PS3-1

Calculate the KE of a running back that has a mass of 80 kg and is running at a velocity of 8 m/s.

• 2,560 joules

• 640 joules

• 1,2800 joules

• 320 joules

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

A cheetah can run briefly with a speed of 31 m/s. Suppose a cheetah with a mass of 47 kg runs at this speed. What is the cheetah’s kinetic energy?

• 1457 J

• 728.5 J

• 45,167 J

• 22,583.5 J

Tags

NGSS.HS-PS3-1