Work, Power, and Simple Machines

According to the scientific definition, in order for work to be done what has to occur?

• Exercise
• Steam
• Electricity
• Movement

Tags

NGSS.MS-PS3-5

What two things do you need to know to calculate work?

• force and gravity
• distance and mass
• gravity and mass
• force and distance

What does the work done on an object depend on?

• direction of force applied and direction of the motion
• direction of gravity and speed of object
• speed of object and air resistance
  the angle of elevation and steepness of hill
• weight of object and angle of force

Tags

NGSS.HS-PS2-1

What does weight measure?

• Mass of an object
• Downward force of gravity
• Upward force of air resistance
• Matter inside an object

Tags

NGSS.MS-PS2-4

What is another name for a newton-meter?

• Newter
• Joule
• Kilogram
• Liter

Tags

NGSS.MS-PS2-2

The rate at which work is done is called ____________________ .

• Power
• Kinetic Energy
• Potential Energy
• Watts

In the work equation, what unit is measures power?

• Joules
• Kinetic Energy
• Potential Energy
• Watts

The ratio of output work to input work is called _________________ .

• Really hard work
• Efficiency

What is a machine that uses only one movement called?

• Simple
• Basic
• Complex
• Compound

Name the type of machine that is described: something that uses a rope and can change the direction of a force.

• Screw
• Wheel and axle
• Lever
• Pulley

Tags

NGSS.MS-PS2-1