Unit 4 Review - Work, Energy, Power

Which action requires no Work:

• carrying a 25 kg backpack home from school
• picking up a pencil off the ground
• pushing a table across the floor
• lifting a balloon over your head

Energy is measured in units of:

• Newtons
• Joules
• Watts
• kg*m/s²

How much work is done when a server lift an 84 N tray of food 0.5 meters and then carries it 30 meters to the other side of the restaurant?

• 42 J
• 2520 J
• 15 J
• 2562 J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

How much force is need to pull a wagon 6.5 meters and do 325 J of work?

• 50. N
• 2100 N
• 0.020 N
• 330 N

How much work is done to lift a 4.75 kg box to a height of 1.4 m?

• 6.7 J
• 65 J
• 33 J
• 3.4 J

Gravitational Potential Energy of an object depends on the object's...

• speed
• acceleration
• height
• color

Tags

NGSS.MS-PS3-2

Kinetic Energy of an object depends on the objects...

• mass and velocity
• velocity
• weight
• mass and height

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What is the velocity of a 2.40 kg toy car that has 17.8 J of kinetic energy?

• 3.85 m/s
• 7.42 m/s
• 6.18 m/s
• Not enough info

What happens to E_P of a book resting on a book shelf if you double it's mass?

• gets cut in half
• stays the same
• doubles
• quadruples

How high do you need to lift a 6.0 kg baby to increase it's E_P to 180 J?

• 3.06 m
• 30. m
• 0.033 m
• 7.75 m