PS Work and Power

Multiple Choice

Why is the concept of work and power important in our daily lives?

• Because it helps us understand how machines operate and how we use energy.

• Because it only applies to scientists and engineers.

• Because it is only relevant in sports.

• Because it is not related to energy transfer.

Open Ended

Explain how work and energy are related when a force causes a body to move through a distance.

Multiple Choice

What are the SI units for work?

• Joules (J)

• Watts (W)

• Kilograms (kg)

• Centimetres (cm)

Multiple Choice

Which of the following equations correctly represents the relationship between work, force, and distance?

• W = F x d

• W = F + d

• W = F / d

• W = d / F

Multiple Choice

Which of the following calculations would you use to find the distance moved if you know the work done and the force applied?

• d = W / F

• d = F x W

• d = F / W

• d = W + F

Open Ended

Calculate the work done when a force of 6N moves through a distance of 40cm.

Multiple Choice

Calculate the value of the force required to do 600J of work over a distance of 50m.

• 12 N

• 30000 N

• .08 N

• I have no clue what I am doing.

Math Response

Calculate the distance moved by a force of 8N when it does 72J of work. Show your work.

Type answer here

Correct Answer: 72\div8=9

Deg^°

Rad

Multiple Choice

What is the total work done by a child of weight 300N climbing 12 steps, each of height 20cm?

• 720 J

• 600 J

• 360 J

• 900 J

Try number 6 in your notes.

Don't forget to Guess and show your work.

Did you get 500 --> Good, but you forgot something. Make sure you have your units!

Try number 7 in your notes

Don't forget to Guess and show your work.

Did you get 75 --> Good, but you forgot something. Make sure you have your units

Multiple Choice

Which of the following is the correct formula for power as described in the slides?

• Power = Work done / Time taken

• Power = Force x Distance

• Power = Energy x Time

• Power = Work done x Time

How much energy does a 60 watt light bulb use for every second it is on?

P=E/t
Have to rearrange the equation to get E.

E=Pt
E= 60*1= 60 Joules

Multiple Select

Select all the quantities that are measured in joules (J) according to the slides.

• Work done

• Energy

• Power

• Time

Now try number 12 in your notes

P=E/t

Did you get 100 --> Good, what are your units?

Now try number 13 in your notes

Hint- you need to find how much work they do first and then solve for each of their power.

Multiple Choice

Which formula is used to calculate the power of an electric motor that lifts a mass upwards?

• P = t / F

• P = mgh

• P = W * t

• P = W / t

Multiple Choice

How much power will of a person moving with 400 J of kinetic energy for 5 s?

• 80 W

• 2000W

• 8 W

• I have no clue what to do.

Multiple Choice

Power is measured in _________.

• Joules

• Newtons

• Watts

• Meters

Multiple Choice

What is the relationship between work and energy as described in the lesson?

• Work is always greater than energy.

• Work and energy are unrelated.

• Work done equals energy transferred.

• Energy is always greater than work.

Multiple Choice

Are your notes on pages 2-3 (#s 1-15) filled out?

• Yes

• No

• I didn't even know I had notes.