work and power by:Maria/Lara & of course Maya hello:)

what is the equation of power?

• (force*distance)/time

• Mass*Time

• Acc/Time

• Acc*VF

how does time affect work

• when the time is greater work increases

• when the time is greater work decreases

• time doesn’t affect work

• work is less greater when the time decreases

power affects work but work doesn't affect power

• True

• False

How much work is being done with 200 N of force over 426 meters?

• 85,200 J

• 45,620 J

• 90,480 J

• 62,329 J

Pick the most accurate description for power

• equals force times the distance through which the force acts (in Watts)

• the rate at which work is done (in Joules)

• equals force times the distance through which the force acts (in Joules)

• the rate at which work is done

What is the Power in the following picture if the weight of the boy is 300N and the height of the stairs is 3 meters in 5 seconds.

• 160

• 180

• 200

• 250

distance * force

• power

• work

• momentum

• watt

Pick the most accurate description of power :

• equals force times the distance through which the force acts (in Watts)

• the rate at which work is done (in Joules)

• equals force times the distance through which the force acts (in Joules)

• the rate at which work is done

In climbing the stairs, is your work the same every trial?

• No, because every time I climb the stairs, my time is different.

• Yes, because work does not depend on the power and the distance is the same.

• Yes, because the distance is the same.

• No, because work depends on power.

if the young girl walks up the stairs three times, when is her work going to be the least greatest?

• first trial

• second trial

• third trial

• none of the above