Energy

The total energy in an isolated system can be increased.

• True
• False

Tags

NGSS.HS-PS3-1

A roller coaster car is poised at the top of the first hill on its track. What type of energy is the car's total energy stored as?

• Kinetic
• Thermal
• Potential
• Mechanical

Tags

NGSS.MS-PS3-2

That same roller coaster car moves down the hill. Assuming that the track is frictionless, which option represents the transfer of energy?

• Potential to Kinetic
• Kinetic to Potential
• Mechanical to Thermal
• Mechanical to Potential

Tags

NGSS.HS-PS3-3

If the roller coaster track is not frictionless, which option best represents the transfer of energy?

• Thermal to Kinetic and Potential
• Kinetic to Thermal and Potential
• Potential to Kinetic and Thermal

Tags

NGSS.HS-PS3-3

NGSS.HS-PS3-4

A box with a mass of 20 kg is moving with a velocity of 3 m/s to the right. How much kinetic energy does it have?

• 60 J
• 75 J
• 90 J
• 180 J

Tags

NGSS.HS-PS3-1

A spring with a spring constant of 3 N/m is compressed by 4 cm. How much potential energy is stored in the spring?

• 0.0024 J
• 0.024 J
• 2.4 J
• 24 J

Tags

NGSS.HS-PS3-2

A 1 kg mass is placed against that same spring. When released, the spring imparts all of its energy to the mass. If the surface on which the mass rests is frictionless, what is the speed that the mass will move with?

• 6.9 cm/s
• 7.2 cm/s
• 12.1 cm/s
• 1.3 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

A frictionless penduluum swings through its full range of motion at the surface of the Earth. At the lowest point of its motion, it is moving with a velocity of 2 m/s. How high above its lowest point will it rise?

• 0.22 m

• 0.38 m

• 0.41 m

• 0.56 m

Calculate the PE of a 2 kg cat perched 10 meters above the ground. 

• 20 J
• 200 J
• 2.04 J
• 200 W

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-2

True or false: when the distance an object moves is zero the work done on the object is also zero.  

• True
• False