What is Work?

How is work defined?

• the amount of energy 
• the transfer of force over a distance
• rate of work in a given time
• the change in distance in a given time

What is the equation for work?

• W = mass * acceleration

• W = force * distance *cos(theta)

• W = force/distance

• W = speed/time

Which of the following is an example of work being done?

• Teacher sitting in a chair
• Book resting on desk
• Keys hanging from a key chain
• A ball being rolled on the floor

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-1

Which of the following IS NOT an example of work being done?

• Pushing a cart in a store
• Shooting a basketball
• A stand off in tug of war
• Running a mile

If a student uses 10 Newtons of Force to push a chair along the floor for 5 meters, how much is work is being done?

• 2 Joules

• .5 Joules

• 50 Joules

• 20 Newtons

If a boulder is lifted by a forklift a distance of 10 meters with a force of 30 Newtons. How much work is being done?

• .333 Joules
• 3 Joules
• 300 Joules
• 60 Joules

Tags

NGSS.MS-PS3-5

If a lion drags his prey 10 meters horizontally to his den doing 500 joules of work, how much force did he use?

• 50 Newtons

• 500 Joules

• 50,000 Newtons

• 10 Newtons

A 36.0 N force is applied to an object that moves 11.0 m

in the same direction as the applied force on a frictionless

surface. How much work is done on the object by the

force?

• 0 J

• -175 J

• -396 J

• 396 J

A 36.0 N force is applied to an object that moves 11.0 m in

the opposite direction of the applied force on a frictionless

surface. How much work is done on the object by the

force?

• 0 J

• -175 J

• -396 J

• 396 J

A 36 N force is applied to an object that remains stationary.

How much work is done on the object by the applied

force?

• 0 J

• -175 N

• -396 N

• 396 N