Work and Power Math Review

In what direction does an applied force move an object?

• At a right angle to the applied force.
• In the opposite direction of the applied force.
• In the direction of the applied force.
• In a random direction unrelated to the applied force.

Tags

NGSS.HS-PS2-1

Which action is not an example of work?

• Lifting a box off the ground.
• holding a tray in the cafeteria line

• Pushing a cart forward.
• Carrying groceries to the car.

Tags

NGSS.MS-PS3-5

What is the definition of power?

• Power is the total amount of energy stored.
• Power is the force applied to an object.
• the rate at which work is accomplished

• Power is the distance covered by an object.

What is the power of 600 joules of work done in 4 seconds? (P=W/t)

• 200 watts
• 75 watts
• 300 watts
• 150 watts

A student pushes a 40-N block across the floor for a distance of 10 m.

How much work was done to move the block? (Work = force x distance)

• 50 J
• 400 J
• 1000 J
• 200 J

What is the scientific definition of energy that relates it to work?

• the ability to use an applied force to make an object move

• Energy is a form of matter.
• Energy is the speed of an object.
• Energy is the total amount of heat in a system.

How is power defined?

• Power is the total amount of energy stored.
• the rate at which work is accomplished

• Power is the force applied over a distance.
• Power is the maximum energy capacity of a system.

What is the definition of energy in scientific terms?

• Energy is the speed of an object.
• Energy is a type of matter.
• The ability to do work.

• Energy is the total amount of heat in a system.

Tags

NGSS.HS-PS3-2

What is a watt, which is a unit of power, equal to?

• 1 watt is equal to 1000 joules per minute.
• 1 watt is equal to 1 kilowatt per hour.
• 1 watt is equal to 1 volt per ampere.
• a joule divided by a second

What is a joule, which is a unit of work, equal to?

• a newton times a meter

• 1 joule is equal to 1 newton second.
• 1 joule is equal to 1 kilogram meter per second.
• 1 joule is equal to 1 watt second.