 Holt Physics—Chapter 5: Function and EnergyPrice

I. Section 5. 1—Work

A. Definition of work

1 . Work does not always mean the same thing in Physics mainly because it does inside the everyday sense of the term. 2 . Operate is defined as a force leading to a shift.

Work = force by displacement

W = Fd

3. Work is NOT done on an object unless the displacement is greater than no 4. The sole forces which might be considered to will work are the ones that are parallel to the displacement. 5. For this reason we make use of our trigonometric functions to calculate makes applied into the angle.

Insert Fig 5-2

6. Remember that Θ is the angle between your applied pressure and the displacement. 7. Function is explained in Newtons x meters (force times displacement). The system of work is a Joule (J) 8. you Newton meter = you Joule

9. Work is a vector with both path AND magnitude. This means WORK CAN BE UNFAVORABLE! 10. Unfavorable work is quite commonly used to slow a subject down or decrease it is velocity.

2. Section 5-2: Energy

A. Kinetic Strength

1 . Kinetic energy is associated with a subject in movement. 2 . Kinetic energy will depend on speed and mass

Kinetic Energy sama dengan ½mv2

3. Kinetic energy is actually a scalar and can use Joules as its normal unit. 4. It takes a few work to modify an object's kinetic strength either simply by changing the velocity or changing the mass. 5. This kind of fact potential clients us towards the Work-Kinetic Strength Theorem

WORK-KINETIC ENERGY THEOREM

Wnet = ∆KE

Net work sama dengan change in kinetic energy

six. Notice that Wnet = ∆KE

and

Wnet = Fnetd(cosΘ) ( (from section 1) therefore ,...

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