Work & Machines Test

Which of these is a measurement of power?

• 100 joules

• 100 watts

• 100 meters per second

• 100 hertz

Which of the following is true about work?

• It measures how quickly an object accelerates

• It measures how much effort is applied over a distance.

• It measures the change of an object's rate of speed.

• It measures how much time it takes to move an object.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

When is work being done?

• When an object moves in the same direction as its force.

• When an object moves in the opposite direction as its force.

• When a force causes the object to move more quickly.

• When an object stops moving.

Tags

NGSS.MS-PS3-5

What units do we use to measure work?

• watts

• newtons

• joules

• meters

In which of these cases is work being done?

• A student sleeps all night.

• A student pushes a locked door that does not move.

• A student carries his chair into another room.

• A student sits on the carpet.

A force exerted over a distance to move an object is ______________________.

• power

• work

• momentum

• Watt

How do we calculate work?

• W = F * d

• w = f * D

• W = F * D

• w = f * d

Tags

NGSS.MS-PS3-4

How do you calculate power?

• P = W/t

• P = E/t

• P = w * t

• P = bbq/chicken

A wheelbarrow is an example of

• First Class Lever
• Second Class Lever
• Third Class Lever
• Fourth Class Lever

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

In a first class lever, the _____ is in the middle.

• Effort
• Fulcrum
• Load
• Machine

Tags

NGSS.MS-PS2-2