🏃🏻‍♂️ 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?

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

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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).

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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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