Choose the word that best completes each sentence:

1. If friction can be ignored, the ​ (a)   of a system doesn't change

2. The energy stored in a compressed spring is ​ (b)  

3. The ​ (c)   is the standard unit for energy.

4. When a book is moved from a higher shelf to a lower shelf, its ​ (d)   changes

5. The muscles of a runner transform chemical potential energy into ​ (e)  

• mechanical energy
• elastic potential energy
• joule
• gravitational potential energy
• kinetic energy
• Law of Conservation of Energy

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

For which of the following is kinetic energy transformed into potential energy?

• a rock rolls down a hill

• a ball is thrown upward

• a swing comes to a stop

• a bowling ball rolls horizontally

Tags

NGSS.MS-PS3-5

The gravitational potential energy of an object changes when which two of the following changes?

• the object's speed

• the object's mass

• the object's temperature

• the object's height

Friction causes mechanical energy to be transformed into which of these forms?

• thermal energy

• kinetic energy

• nuclear energy

• potential energy

The kinetic energy of an object changes when which of the following changes?

• the object's chemical potential energy

• the object's volume

• the object's density

• the object's velocity

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

When an energy transformation occurs, which of the following is true?

• Total amount of energy doesn't change

• Mechanical energy is destroyed

• Mass is converted into energy

• Mechanical energy is created

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

Complete the flow chart by choosing the correct word for each letter:

a: ​ ​ (a)  

b: ​ (b)   ​

c: ​ (c)   ​

d: ​ (d)  

e: ​ (e)  

• forms
• kinetic energy
• stored energy
• converted
• destroyed or created
• chemical energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

3 toy cars, each with a mass of 0.05 kg, roll down ramps of different heights. Use the information in the chart to fill in the missing spaces. Use g=9.81 and round your final answers to 2 decimal places. Drag and drop the answers onto the correct place in the table- you may not use all of the options.

e

f

g

h

d

4.43

19.6

0.51

0.75

0.49

0.37

0.25

1.96

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-4

The graph shows the kinetic energy of a car (kJ) as the speed of the car (m/s) changes. When the car's speed doubles from 20 m/s to 40 m/s, by how many times does the car's kinetic energy increase?

• The kinetic energy stays the same

• The kinetic energy doubles

• The kinetic energy is 4 times larger

• The kinetic energy is 6 times larger

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Using the graph, estimate the car's kinetic energy at a speed of 50 m/s.

• 2400 kJ

• 3600 kJ

• 500 kJ

• 1600 kJ

Tags

NGSS.MS-PS3-1