AP Physics 1 Study Notes

Work 02/16/23


Work is the mechanical transfer of
energy
ability
↳ is the to do work
energy
AE
↳ W= -> Jovies/Jovies?

force xdistance
Work= I



Wf d
=




↳ W
x




F,d
=

FcosO.d
=
- -?? -- Fi

(N.m) 1 -d -
1




Work -
scalar

Units:Joules, J (kgm2/s) Athough work is a scalar we can still do
(A) and <-> Work
I F




s
-




a
↑
0
=




F d d


↑ I I
-
Work done lowering ball
work done
lifting ball

If work was done 1-3 Work was done

-- - 1 - & I
CASW Or ->W d
Or d
a- - d ->

, Example

Push a box to R w/ a force of 5N a distance 2m.
of If is 2.50. How
much work?
FN 3N W Fxd
= =




↑
5x2
=




Ff 2.5N =
F 5N
=

105
=




-
Fg 3N =

m
Power

-


another conceptrequiring a strict
physics definition
rate of
doing work
-




formula:p W/t f.d(t F.v
= =
-
=




-

Units:Joules/second Watts, W
=




↳ alternate unit (NOT S1):horsepower
↳
In.p. =
746 Watts



p
z EpE - P. t E
=
=
= =




Electrical
Energy is sold in units of kWh (kilowatt-hours)

kW.h 10005/s.
=

3600s 3,600,000 T
=




Rate: $12/kW.h Example Determine costof
making a
potof coffee
in a 900W coffee maker for 10.0min
Cost usex rate
=




(kWh) ($/kw.n) cost =
useXrate

(0.900kW-687) $0.12)wh
=
x



$0.02
=