Chapter 5, Work Energy and Power Flashcards Preview

Physics: Forces and Motion > Chapter 5, Work Energy and Power > Flashcards

Flashcards in Chapter 5, Work Energy and Power Deck (10):
1

Defining equation for work done?

W = Fx cos(θ) (work = force * displacement in direction of force).

2

Difference between work and energy?

Energy is capacity to do work or work done = energy transferred.

3

What are the different forms of energy?

Kinetic, gravitational PE, chemical, elastic PE, electrical PE, nuclear, electromagnetic, sound (or KE), internal/thermal.

4

Formula for kinetic energy?

(mv^2)/2 (half mass * velocity squared).

5

Formula for change in GPE?

ΔGPE = mgΔh (mass * gravitational field strength * change in height) assuming uniform field.

6

If using energy to find velocity of an object falling down a slope which forms of energy must you take into account?

GPE, KE and energy lost due to resistive forces (Fx).

7

Defining equation for power?

P = W/t (power = rate of change of work done)

8

Unit for Energy?

Joule (J)

9

Unit for power?

Watt (W)

10

Equation for power that isn't P=W/t?

P=Fx (Power = force * velocity)