Objectives Relate (without calculation) power to work done and time taken, using appropriate...

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Transcript of Objectives Relate (without calculation) power to work done and time taken, using appropriate...

Page 1: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

W=Fd

Page 2: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

PowerObjectives

Relate (without calculation) power to work done and time taken, using appropriate examples

Recall and use the equation P = E/t in simple systems.

Outcomes

C: Describe what power is in relation to work.

B: Calculate power for various problems.

A: Carry out multiple step calculations involving energy, work and power successfully.

Key terms: work, power, energy, time, watts, joules

Page 3: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

PowerOutcomes

C: Describe what power is in

relation to work.

B: Calculate power for various

problems.

A: Carry out multiple step calculations

involving energy, work and power

successfully.Key terms: work, power, energy, time, watts, joules

Page 4: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

PowerOutcomes

C: Describe what power is in

relation to work.

B: Calculate power for various

problems.

A: Carry out multiple step calculations

involving energy, work and power

successfully.Key terms: work, power, energy, time, watts, joules

Page 5: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

PowerOutcomes

C: Describe what power is in

relation to work.

B: Calculate power for various

problems.

A: Carry out multiple step calculations

involving energy, work and power

successfully.Key terms: work, power, energy, time, watts, joules

Page 6: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

A lawnmower engine does 10 kJ of work in 10 seconds. What is the power of the engine?

Calculating power question 1

= 1,000 W = 1 kW

power =work done

time

= 10,000 / 10

Page 7: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

A car transfers 12 MJ of energy in 2 minutes. What is the power of the car?

Calculating power question 2

= 100,000 W = 100 kW

= 12,000,000 / 120

power =work done

time =energy transfer

time

Page 8: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

Power, work and time calculations

Page 9: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

PowerTask

Calculate the work done and power of you moving across

the classroom.

Show all measurements and calculations carried out.

Outcomes

C: Describe what power is in relation to work.

B: Calculate power for various problems.

A: Carry out multiple step calculations involving energy, work and power successfully.

Key terms: work, power, energy, time, watts, joules

Page 10: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

PowerTask

Answer the questions on work, energy and power

Outcomes

C: Describe what power is in relation to work.

B: Calculate power for various problems.

A: Carry out multiple step calculations involving energy, work and power successfully.

Key terms: work, power, energy, time, watts, joules

Page 11: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

Power

Key terms: work, power, energy, time, watts, joules

Page 12: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

Power

Key terms: work, power, energy, time, watts, joules

Page 13: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

Power

Key terms: work, power, energy, time, watts, joules

Page 14: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

Power

Key terms: work, power, energy, time, watts, joules

Page 15: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

Power

Key terms: work, power, energy, time, watts, joules

Page 16: Objectives Relate (without calculation) power to work done and time taken, using appropriate examples Recall and use the equation P = E/t in simple systems.

Extension1. Anuar runs up a 2.91-meter high flight of stairs at a constant speed in 2.15 seconds. If Anuar’s mass is 55.9 kg, determine the work which he did and his power rating. 2. On a recent adventure trip, Lucia went rock-climbing. Lucia was able to steadily lift her 45.0-kg body 20.0 meters in 100 seconds. Determine Lucia's power rating during this portion of theclimb. 3. Hina owns a family of squirrels. The squirrels have been trained to do push-ups inrepetitive fashion. Being connected to an electrical generator, their ongoing exercise is used to help power the home. There are 23 squirrels in the family and their average mass is 1.1 kg. They do work on the "up" part of the push-up, raising their body an average distance of 5.0 cm.If the squirrels averages 71 push-ups per minute, then determine the total amount of work done in one minute and the power generated by their activity 4. An elevator motor lifts 715 kg of mass to the height of the fourth floor of an office building (11.0meters above ground level) at a constant speed in 9.35 seconds. Determine the power rating of themotor.


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