Work and Energy

If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?

• 2N
• 5N
• 10N
• 15N

Tags

NGSS.HS-PS2-1

How much work is produced when 350 N is used to move a car 5 m?

• 70 J
• 1750 J
• 355 J
• 175 J

Tags

NGSS.MS-PS3-5

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?

• 1
• 10
• 100
• 1000

What is power?

• time it takes to do work
• work
• machine

A 5000N block is lifted 10 m. How much work was done?

• 50000 J
• 5000 J
• 500 J
• 50 J

Tags

NGSS.HS-PS3-1

A bulb uses 1,000 J of energy in 50 sec. What is the power of the lightbulb?

• 15W
• 20W
• 25W
• 30W

The SI unit or force is

• Newton (N)
• Watt (W)
• Joules (J)

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A machine is a device that____________.

• changes either the magnitude or direction of force
• always makes lifting objects require more effort
• changes only magnitude of the force
• Changes only direction of the force

An example of a lever is a ...

• pulley
• bicycle 
• scissors 
• screw 

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A lever is used to raised a 12 kilograms mass with a effort that is only 4 kilograms. What is the mechanical advantage ? 

• 12
• 4
• 3
• 32