Physics 121 9/22/10

Prof. E. F. Redish 1

9/22/10 1 Physics 121

2.1 2.A1 2.A2 2.B1 2.B2

a 2% 95% 1% 0% 1%

b 3% 0% 1% 0% 2%

c 0% 0% 0% 1% 2%

d 96% 1% 96% 0% 1%

e 0% 0% 1% 0% 0%

f 0% 0% 0% 11% 84%

g 0% 0% 0% 87% 5%

n 0% 1% 0% 2% 5%

9/22/10 3 Physics 121

T = v

x = v t

9/22/10 6 Physics 121

Physics 121 9/22/10

Prof. E. F. Redish 2

9/22/10 7 Physics 121

T =I

m

delivered by hammer to object

number of bowling balls

9/22/10 8 Physics 121

v = Im

x = v t

9/22/10 9 Physics 121

Physics 121 9/22/10

Prof. E. F. Redish 3

I = F t

v =F

m

t

x = v ta = F

m9/22/10 10 Physics 121

9/22/10 11 Physics 121

9/22/10 13 Physics 121

Physics 121 9/22/10

Prof. E. F. Redish 4

9/22/10 15 Physics 121

9/22/10 16 Physics 121

T T

T = ks(“s” = stretch

or squeeze)

9/22/10 17 Physics 121

Physics 121 9/22/10

Prof. E. F. Redish 5

[F] = [ma] = ML

T 2

Remember

“dynes”

9/22/10 18 Physics 121

F (object causing force) (object feeling force)

9/22/10 19 Physics 121

9/22/10 20 Physics 121

a Fm

net

=