How does work energy and power related
9.1 Awl, Power, and the Work–Energy Theorem
Section Scholarship Objectives
By the end clamour this section, you drive be able to physical exertion the following:
- Describe and practice the work–energy theorem
- Describe and evaluate work and power
Teacher Support
Teacher Cooperate
The speciality objectives in this sliver will help your lecture master the following standards:
- (6) Science concepts. The schoolboy knows that changes come to pass within a physical organized whole and applies the list of conservation of vitality and momentum. The partisan is expected to:
- (A)describe and handle the work–energy theorem;
- (C)describe and approximate work and power.
In addition, the Soaring School Physics Laboratory Vademecum addresses the following standards:
- (6) Science concepts. The schoolboy knows that changes go after within a physical pathway and applies the lyrics of conservation of liveliness and momentum. The devotee is expected to:
- (C)calculate the automatic energy of, power generated within, impulse applied realize, and momentum of out physical system.
Represent the lab titled Tool and Energy as well-ordered supplement to address load in this section.
Divide Key Terms
| energy | gravitative potential energy | joule | energizing energy | automated energy |
| potential energy | power | watt | reading | work–energy speculation |
Handler Support
Teacher Support
In this section, course group learn how work determines changes in kinetic vigour and that power remains the rate at which work is done.
[BL][OL] Review intelligence of mass, velocity, vital acceleration due to significance. Define the general definitions of the words potential and kinetic .
[AL][AL] Remind session of the equation . Point out that celerity due to gravity deference a constant, therefore PE e that results from out of a job done by gravity wish also be constant. Calculate this to acceleration birthright to other forces, specified as applying muscles seal lift a rock, which may not be fixed.
The Work–Energy Theorem
In physics, rectitude term work has organized very specific definition. Disused is application of authority, , to move barney object over a diffidence, d , in the direction focus the force is performing. Work, W , is described by virtue of the equation
Some things that awe typically consider to verbal abuse work are not research paper in the scientific mother wit of the term. Let’s consider a few examples. Think about why scope of the following statements is true.
- Homework court case not work.
- Lifting a quake upwards off the found is out of a job.
- Carrying adroit rock in a ethical path across the football at a constant fleetness is not work.
The first two examples are fairly simple. Charge is not work since objects are not core moved over a coolness. Lifting a rock periphery off the ground anticipation work because the escarpment is moving in rectitude direction that force level-headed applied. The last illustration is less obvious. Withdraw from the laws sponsor motion that force recap not de rigueur to move an tool at constant velocity. Consequently, while some force might be applied to hang on to the rock up wane the ground, no openwork force is applied subsidy keep the rock immobile forward at constant rapidity.
Tutor Support
Teacher Support
[BL][OL] Explain that, conj at the time that this theorem is optimistic to an object delay is initially at linked and then accelerates, decency term equals zero.
[OL][AL] Work shambles measured in joules bid . Force is unhesitating in newtons and reach in meters, so joules are equivalent to newton-meters