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

If a crate is moved 10 m with a force of 50 N, how much work is done?

• 40 Joules

• 60 Joules

• 500 Joules

• 5 Joules

Tags

NGSS.MS-PS2-2

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

• Energy cannot be created or destroyed.

Tags

NGSS.MS-PS3-5

 Energy from the sun is known as......... 

• hydroelectric energy
• geothermal energy
• solar energy
• wind energy

When a spring is compressed energy is stored in its...

• Thermal potential energy store

• Gravitational potential energy store

• Kinetic potential energy store

• Elastic potential energy store

Energy is measured in.....

• kilograms

• metres per second

• Joules

• metres

What is the gravitational potential energy of an 85 kg mountain climber at the summit of a 6267 m volcano?

Let g = 9.8N/kg

• 5,220,411 J

• 532,695 J

• 73.7 J

• 54,356.6 J

Tags

NGSS.MS-PS3-2

Which of these equations is correct?

•  $efficiency\ =\ \frac{useful\ energy\ transferred}{total\ energy\ transferred}$  

•  $efficiency\ =\ \frac{total\ energy\ transferred}{useful\ energy\ transferred}$  

•  $energy\ =\ efficiency\ \times100\%$  

•  $efficiency\ =\ \frac{wasted\ energy\ transferred}{total\ energy\ tranferred}$  

What percent energy is wasted by a machine if the energy input is 262 J and the energy output is 131 J?

• 5%

• 50%

• 100 J

Tags

NGSS.HS-PS3-1

A watt is equal to _______.

• one newton-meter
• one meter per second
• one newton per second
• one joule per second