TEST REVIEW Energy Work & Power

Energy due to motion is ____________ energy. 

• Potential 
• Energy
• Kinetic
• Friction

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

The faster an object moves, the ________ kinetic energy it has. 

• more
• less
• none of the above
• all of the above 

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which has a greater impact on KE?

• mass
• velocity

Tags

NGSS.MS-PS3-1

The SI unit in which kinetic energy is measured is 

• Newton
• Kilogram
• Joules
• Metres per second

Rearrange the equation for kinetic energy to make mass the subject of the equation.

• m = KE/2v²
• m = 2KE/v²
• m = v²/2KE
• m = 2v²/KE

Tags

NGSS.HS-PS3-1

Rearrange the equation for kinetic energy to make velocity squared the subject of the equation.

• v² = KE/2m
• v² = 2m/KE
• v² = 1/2 KE m
• v² = 2KE/m

How much kinetic energy does a moving 6 kg object have if it moves with a velocity of 3 m/s?

• 27 J
• 18 J
• 9 J
• 2 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What is the kinetic energy of a 1500-gram object moving at a velocity of 100 m/s

• 112.5 J

• 7,500,000 J

• 75 J

• 7,500 J

Answer explanation

1500 grams =1.5 kg

Need kg for KE formula

KE=1/2(1.5)(100²)

KE = 7500 J

How much kinetic energy does a person of mass 50kg running at 3m/s have? Provide your answer in kJ.

• 225 kJ

• 0.225 kJ

• 75 kJ

• 0.075 kJ

Answer explanation

Every 1000J = 1 kJ

KE=1/2(50)(3²)

KE = 225 J = 0.225 kJ

A moving 10 kilogram object has 20 Joules of kinetic energy. What is its velocity?

• 2 m/s

• 4 m/s

• 200 m/s

• 10 m/s

Answer explanation

KE=1/2 mv²

20=1/2(10) v²

20= 5 v²

20/5 = v²

√(4) = v

2m/s = v