Work, Power and Simple Machines Quest Review

Which of these is the best definition of work?

• The amount of force it takes to move an object a certain distance

• The amount of power it takes to move an object with a certain speed

• The amount of force it takes to accelerate an object a certain amount

• The amount of power it takes to push an object against gravity

What unit do we use to measure work?

• meters (m)

• Joules (J)

• seconds(s)

• Watts (W)

Tags

NGSS.MS-PS3-5

In which of these scenarios is Work Done?

• A potted plant sits on a table

• A crane lifts a large haul of bricks off the ground for construction

• A pitcher holds a baseball, but does not throw it

• A person carries groceries from their car into their house

In which of these situations is no work done?

• A crane lifts a large metal beam directly off of the grown

• A crane carries a large metal beam horizontally

• A student carries their backpack to class

• A student drags their heavy backpack across the school floor after cleaning out their locker

• A singer holds a microphone to their mouth

Which of these is the best definition of Power?

• The change in position over a certain time

• The amount of force applied over a certain time

• The change in speed in a certain time

• The amount of work done in a certain time

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What unit do we use to measure Power?

• meters (m)

• Joules (J)

• seconds(s)

• Watts (W)

A truck pulls a trailer behind it with 1500 N of force for 200 m. How much work is done?

• 500 J

• 1700 J

• 150,000 J

• 300,000 J

Tags

NGSS.MS-PS2-2

A person carries a box that weighs 200 N over 20 m. How much work is done?

• 0 J

• 200 J

• 40,000 J

• 400,000 J

Which of these scenarios shows the Most Power?

• A crane does 3000 J of work in 500 seconds

• A bulldozer does 1500 J of work in 30 seconds

• A dump truck does 1000 J of work in 30 seconds

• A tug boat does 1500 J of work in 60 seconds

Tags

NGSS.MS-PS3-5

A sportscar's engine propels it forward by exerting 2500 N of force over a distance of 100 m. If it takes the sportscar 24 seconds to do this, how much power is the sportscar's engine producing?

• 104 W

• 10,416 W

• 34,982 W

• 250,000 W

Tags

NGSS.MS-PS3-5