Copy - 3A1b Activ - 9779662.1 Evidence (Honors) _ How Fast Can you Do Work_

Activity | How Fast Can You Work? PART 2 - LEGS 1. Determine the vertical distance in meters from the first floor to the second floor. To do this, measure the height of each step and count the number of steps between the first and second floor. 2. Measure how long it takes you to walk up the stairs at a slow pace. Record your mass (kilograms) and time (seconds) in the data table. 3. Determine the force used on the stairs by taking your mass (kg) times the acceleration due to gravity (9.81 m/s 2 ) 4. Repeat the procedure but this time move at a faster pace. 5. Calculate the work and power that was produced from this activity and record your data in the table. 6. Repeat the steps above for your lab partner. LEGS Mass (kg) Distance (m) Force (N) F= mg Time (s) Work (J) W = Fd Power (W) P= W/t You – Slow 54 4.44 529.2 16.1 2349.65 145.94 You – Fast 54 4.44 529.2 6.22 2349.65 377.76 Partner – Slow 66 4.44 646.8 18.1 2871.79 158.66 Partner – Fast 66 4.44 646.8 6.71 2871.79 427.99 PART 3 - CHEST 1. Choose a true pushup (on toes) or a simple one (on your knees). 2. Use the bathroom scale to determine the “force” that the arms must apply when doing a push-up. Record this value in the data table. 3. Measure the distance in meters that the top of your shoulder moves in one push-up (from straight arms to bent arms) = .35 m 3

Activity | How Fast Can You Work? Force × Distance equals Work Although they traveled a lesser distance, the individual who ascended the steep spiral staircase exerted greater power. The individual who ascended a mild ramp, on the other hand, traveled a greater distance with less force. The force opposing gravity was the same for both individuals since they reached the same height. 6