1.2a – Force, energy, and power examples

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At different times of the day, a student did three sets of bicep curls (where they lift up a dumbbell using their biceps), as described in the image below.

Morning: 4kg, 1m, 30 reps, 60s. Afternoon: 8kg, 1m, 12 reps, 60s. Evening: 4kg, 1m, 15 reps, 20s.

Task - questions

Consider the following two questions: 
At what time was the force largest? 
  • Morning
  • Afternoon 
  • Evening 
  • This happened more than once
At what time was the total work done (energy used) largest?
  • Morning
  • Afternoon
  • Evening
  • This happened more than once

The 8kg ‘weight’ used in the afternoon needs the largest force (around 80 N). 

Even though in the afternoon it had double the weight, the number of reps was more than double in the morning. (Note, you don’t need to calculate the numbers for the energy or power, it can be solved by ratios.)

1.2 – Force, energy, and power

1.2b – Language of power

Last modified: Monday, 20 December 2021, 9:28 PM