Work and mechanical advantage

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 force?

• F= mass × acceleration
• F = mass × distance
• F= distance/time
• F = mass/time 

Tags

NGSS.HS-PS2-1

What is the unit of measurement for work?

• Newtons
• Joules 
• Watts
• Meters

Tags

NGSS.HS-PS3-2

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-PS3-1

NGSS.MS-PS3-5

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

• 2 Joules
• .5 Joules
• 50 Joules
• 20 Newtons

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

• 50 Newtons
• 500 Joules
• 50,000 Newtons
• 10 Newtons

Tags

NGSS.MS-PS2-2

Is this an example of work?
A teacher applies a force to a wall and becomes exhausted.

• True
• False

Is this an example of work? 
A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. 

• True
• False

Is this an example of work? 
A rocket accelerates through space.

• True
• False

Tags

NGSS.HS-PS2-1

What is a machine?

• an object that has AI

• an object that is designed to take over the earth in 2020

• a device that changes force

• a mechanism that is used to decrease the amount of work done