Work and Power Calculations

Work and Power

Open Ended

Type your first and last name

Multiple Select

What period are you in physics?

• 1st period

• 2nd period

• 3rd period

Work

A force applied to an object over a
set distance


Work is found by multiplying
Force and distance.

W=Force * Distance
(if force is parrallel to the displacement)

OR

W=Force * Distance * cosϴ
(if force is at an angle to the direction
of displacement)

Multiple Choice

The football lineman pushes the weighted sled to accelerate it across the football field. Is this an example of positive, negative or zero work being done on the sled?

• Positive

• Negative

• Zero

Multiple Choice

Aaron pulls on the handle of a locked classroom door, but the door is locked and does not open. Is this an example of positive, negative or zero being done on the wall?

• Positive

• Negative

• Zero

Multiple Choice

If the object does not move then what is happening

• nothing

• work

• power

• no work is being done on the object

Multiple Choice

The ( ) the force the ( ) work is done

• less, more

• smaller, more

• bigger, more

• bigger, less

Multiple Choice

Fred kicks a ball with a force of 20N to George, who is 5M away.

How much work was done to the ball?

• 25 J

• 100 J

• 4 J

• 75 J

Multiple Choice

If you push a cart with a force of 60 N for 2 m... how much work have you done?

• 120 J

• 30 J

• 120 N

• 30 N

​https://www.youtube.com/watch?v=4mf6G0hIMUM

Open Ended

Write a summary of learning from the video on the previous slide. This response should be at least a few sentences.

Power

Power is the rate at which something does work over a period of time

Power Formula
Power is found by dividing by Work done by the time taken

Multiple Choice

What are the units for power?

• Watts

• Joules

• Newtons

• Kilograms

Open Ended

Explain how a 45 and 60 watt bulb differ in terms of energy output.

Multiple Choice

What is the formula for power?

• Power = Work x Time

• Power = Force x Distance

• Power = Work/Time

• Power = Force/Time

Multiple Choice

Work divided by time equals...

• energy
• power

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

Multiple Choice

Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.

• Person A

• Person B

Multiple Choice

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

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

Multiple Choice

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

Multiple Choice

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

Work and Power

Multiple Choice

A force of 4.6 N moves a 2.7 kg box a distance of 3.3 m in 6.8 s. How much power is exerted?

• 2.23 W

• 6.03 W

• 17.4 W

• 278.7 W

Multiple Select

Two factors that determine work are...

• Force

• Mass

• Velocity

• Distance