🏃🏻‍♂️ Reflection Questions - Stair Lab

In physics, power is identified as this

• force x distance
• distance / time
• work / time
• time / work

A student ascends the stairs, covering a vertical height of 4.9 meters and weighing 605 N. How much work did they do?

• 1500 J
• 2500 J
• 2964.5 J
• 123.3 J

You did more work when you climbed the stairs:

• slowly

• quickly

• the same amount of work in both cases

• it depends on other factors

What could you change in order to increase the amount of work done?

• Increase the force applied

• Decrease the distance moved

• Reduce the time taken

• Lower the energy used

Did you use more power while climbing the stairs quickly or slowly?

• slowly

• quickly

• the same amount of work in both cases

• it depends on other factors

What could you change in order to increase the amount of power used while climbing the stair?

• Take longer breaks between steps
• Decrease climbing speed
• Increase climbing speed or add weight.
• There is no way to increase power

Look at your data. Who was the most powerful in the class? How much power did they use?

Find the number of calories burned. Take the average work done and divide by 418.4 Calories. Show your work.

There is a basic equivalence between mechanical power and electrical power: a process that generates 100 W of power could, in principle, light a 100 W bulb (assuming no loss of energy). Just as a comparison, how many 60 W light bulbs could Person 2 light when their power from climbing the stairs quickly?

Power is measured in joules per second (J/s), which is also known as watts (W).

I find the topic of power

• pretty straightforward;

  I feel confident.

• a little confusing;

  I need more practice.

• completely awful...I don't get this at all.

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