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AP Physics 1 > Work/Energy > Flashcards

Flashcards in Work/Energy Deck (22):
1

What is the equation for impulse?

Δp=FΔt

2

What is Work?

Means by which energy is transferred (units= Joules)

3

What is Energy?

The ability to do work

4

What is the equation for work?

W=Fd

5

What is Impulse?

Product of force and time; proportional to the product of mass and velocity

6

What does the area of a force vs displacement graph represent?

Work; Fd

7

What is Power?

Rate at which work is done; expressed as number of Joules per second or Watts (W)

8

What is the equation for power?

P=W/t or P=F(d/t) or P=Fv

9

What is Kinetic Energy?

Energy an object has by being in motion relative to a frame of reference

10

What is the equation for Kinetic Energy?

Ke=1/2mv^2

11

What is Potential Energy?

Stored energy related to the position of an object in a frame of reference

12

What is the equation for potential energy?

Pe/Ug=mgh

13

What is the Work-Energy Theorem?

Work done by the sum of all forces acting on an object is equal to the change in that object's kinetic energy; W=ΔKe and W=ΔPe

14

In the absence of frictional forces, total mechanical energy is _______________.

Conserved; equal before and after the motion; ΔPe=ΔKe or mgh=1/2mv^2

15

What is Mechanical Energy?

Sum of potential energy and kinetic energy; total energy of an object/system

16

What is a Conservative Force?

Work done by an object is is independent from the path it takes; mechanical energy is conserved and remains constant with time

17

What is a Nonconservative Force?

Work done by an object is not independent from the path it takes

18

What is an example of a nonconservative force?

Friction or Air Resistance

19

What is the equation for nonconservative forces?

W=E2-E1

20

What is the equation for conservation of a spring?

1/2mv^2=1/2kx^2

21

In what circumstance is there no work even though there is force?

The force is not parallel to the motion; the force is perpendicular to the motion

22

For work, in what direction does the force have to be?

Parallel to the motion; in the direction of the motion