WORK, POWER AND ENERGY

What do you call the rate of doing work?

• Energy

• Time

• Power

• Work

What is the unit of power?

• Joule

• Second

• Newton

• Watt

How much power is required to lift a 30N chair, as high as 0.20m in 2s?

• 1 W

• 7 W

• 3 W

• 15 W

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

What is the difference between calculating power and work?

• Power takes into account the time it takes to complete a task
• Work takes into account the time it takes to complete a task
• Power is force/area
• Work is force/area

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

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

The SI unit of work

• Joules

• Watts

• Newtons

• meters

Power is a measure of how much ______ can be done in a set amount of ______.

• Work, Time
• Work, Energy
• Energy, Force
• Force, Work

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

• 12 J

• 8 J

• 20 J

• 5 J

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-2

NGSS.MS-PS3-4

A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?

• 200 J

• 80 J

• 5 J

• 2000 J

Tags

NGSS.MS-PS3-5