Work and Power

Which of the following is a true statement about work?

• It measures how quickly an object accelerates 
• It measures how much effort is applied over a certain distance
• It measures the change in an object's rate of speed
• It measures how much time it takes to move a massive object

What does one newton exerted over a displacement of one meter equal?

• One watt

• One hertz

• One volt

• One joule

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball? 

• 77 J
• 7.7 J 
• 0.7 J 
• 770 J 

Tags

NGSS.HS-PS3-2

A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has he done?

• 600 J 
• 660 J
• 900 J 
• 1200 J 

Tags

NGSS.HS-PS3-1

Which of these is a measure of force?

• 100 newtons
• 100 meters per second
• 100 joules
• 100 watts

Tags

NGSS.HS-PS2-1

You do 90 joules of work in 30 seconds. How much power have you generated?

• 30 watts
• 3 watts
• 120 watts
• 270 watts

You move an 8-newton weight five meters in 4 seconds. How much power have you generated?

• 160 watts
• 10 watts
• 6.4 watts
• 17 watts

Which of the following would produce the most power?

• A mass of 10 kilograms lifted 10 meters in 10 seconds 
• A mass of 10 kilograms lifted 10 meters in 5 seconds
• A mass of 5 kilograms lifted 10 meters in 5 seconds
• A mass of 5 kilograms lifted 5 meters in 10 seconds

Which of the following is the best example of work being done.

• doing homework

• lifting a box

• pushing a stationary box

• holding a box

Tags

NGSS.HS-PS2-1

True or false: when the displacement an object moves is zero the work done on the object is also zero.

• True

• False