I Can #2 Send Off

Extra Extra EXTRA Work + Efficiency Practice

Poll

24.5kg is equal to how many Newtons (N) of force?

• 24.5N

• 245N

• 2450N

• 24500N

- Ms. Turner

" Thou shalt not forget W = F x D over the break of spring. " 

Let us begin some reminders...

Multiple Choice

What is the correct formula for finding distance?

• D = W/F

• D = F/W

• W = F x D

• F = D/W

Efficiency Problem:

Ms. Turners test result

I struggle with math SOMETIMES*. I got my recent test back from Mrs. G, and got 22 points out of 35.

Poll

If Ms. Turner got 22/35 on Mrs. Gifford's test, what percent did I get? Round up to a whole number

• 0.63%

• 63%

• 770%

• 6.3%

Multiple Choice

Grade 8's found that 1600J of work were needed to get 1200J of work from the treadmill in the gym. The efficiency of this treadmill was …

• 133%

• 75%

• 25%

• 0.75%

Multiple Choice

You put in 400J of work into your skateboard to get to school every morning. Only thing is, its about 70% efficient. How much work (J) does your skateboard do?

• 280J

• 5.70J

• 28000J

• 570J

Fill in the Blanks

This type of work is put into a machine by the person (you) using it.

Open Ended

Why do you think machines lose energy? Why can't we make all machines 100% efficient?

Poll

After discussing, what do you believe is the strongest reason why machines lose energy?

• Friction

• Heat

• Air Resistance

• Other/Not on Board

Poll

Spring Break Plans?

• Resting, sleeping and/or fasting.

• Vacay! Buh-bye.

• Video games until I hear birds chirping

• Seeing friends