work, power, machines QUIZ

A machine is defined as an object that makes work easier by changing the __________,_________, OR ___________ (Select ALL that apply) over which a force is applied.

• Size
• Direction
• Power
• Distance

Tags

NGSS.MS-ETS1-2

If Priya lifts a 10 N object 2 meters, how much work is done?

• A. 5 J

• B. 20 J

• C. 12 J

• D. 8 J

Daniel is building a treehouse and needs to lift heavy wooden planks. He has access to several tools. Which of the following is not one of the six simple machines that could help him?

• A. Lever

• B. Pulley

• C. Engine

• D. Wedge

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Power is defined as:

• A. Force per unit area
• B. Work done over time
• C. Mass times velocity
• D. Energy stored in an object

Tags

NGSS.MS-PS3-4

Evelyn is working on a science project where she needs to measure the power of a small motor. What is the SI unit for power?

• A. Joule

• B. Pascal

• C. Newton

• D. Watt

Which simple machine is found at the tip of a knife?

• A. Screw
• B. Wedge
• C. Lever
• D. Pulley

Jackson is using a shovel to dig a hole in his backyard. The shovel is an example of a:

• A. First-class lever

• B. Second-class lever

• C. Third-class lever

• D. Pulley system

Which simple machine would help Emma lift a flag up a flagpole?

• A. Screw

• B. Pulley

• C. Lever

• D. Wedge

Tags

NGSS.MS-PS2-1

Henry is building a treehouse and needs to use a screw. A screw contains which OTHER simple machine?

• A. Inclined plane

• B. Wedge

• C. Lever

• D. Wheel and axle

Which of the following is not a compound machine?

• A. Bicycle
• B. Scissors
• C. Ramp
• D. Can opener