Work & Power / Simple Machines

The ramp on the back of a moving van is an example of what type of simple machine?

• A pulley

• An inclined plane

• wheel & axle

• A wedge

In the picture above,the input force is-

• the force of gravity on the wheel barrow

• the force of the load in the wheel barrow

• the force of friction between the wheel and the ground

• the boy applies force to the handles

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which simple machine is used in the picture?

• Inclined plane

• Lever

• Wheel & axle

• Pulley

The number of times a machine multiples your effort force is called-

• mechanical advantage

• mechanical efficiency

• work

• power

Caroline uses 20 N of force to move a box of books 15 m. How much work did she do?

• 300 J

• 35 J

• 0.75 J

• 1.33 J

Tags

NGSS.MS-PS3-5

Identify all of the ways that make pulleys work easier.

• Pulleys increase the amount of input force required to move an object

• Pulleys reduce the amount of input force required to move an object

• Pulleys increase the amount of work done.

• Pulleys change the direction of a force that is exerted.

• Pulleys decrease the amount of work that is done

Tags

NGSS.MS-ETS1-1

Which part of the wheel barrow represents the fulcrum?

• the load

• the wheel

• the handle

• there is no fulcrum

To complete a project, it took 200,000 Joules of work. It took 20 seconds to complete. How much power is was needed?

• 0.0001 W

• 200,020 W

• 10,000 W

• 1,000,000 W

Which of these has the greatest # of simple machines?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-1

What is being performed when a force moves an object a distance?

• work

• power

• force

• motion

Tags

NGSS.MS-PS3-5