Power

What is needed calculate power?

• work

• time

• mass

• distance

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

• 100 watts

• 400 watts

• 104 watts

• 50 watts

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If a group of workers can apply a force of 1,000 Newtons to move a crate 20 meters, what amount of work will they have accomplished?

• 20,000 J
• 200 J
• 2,000 J
• 20 J

If 68 W of power is produced in 18 seconds, how much work is done?

• 1,224 J
• 0.264 J
• 3.77 J
• 12.24 J

Tags

NGSS.HS-PS3-1

How much time is needed to produce 720 Joules of work if 90 watts of power is used? 

• 0.125 s
• 8 s
• 64800 s
• 80 s

Tags

NGSS.HS-PS3-1

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

W = 500 Joules 
t = 25 seconds
P = ???

• 0.05 W
• 20 W
• 12500 W
• 2000 W

Tags

NGSS.HS-PS3-1

What is the unit of measurement for Power?

• Joules
• Newtons
• Watts
• Meters

What is power?

• transfer a force through a distance
• the rate of speed 
• the rate of work being done
• transfer of space over time

What is the equation for work?

• W = mass * acceleration
• W = force * distance
• W = force/distance
• W = speed/time