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F o r c e s. F o r c e. A P u s h o r P u l l F o r c e s c a u s e a c h a n g e i n m o t i o n. F o r c e. A r i s t o t l e ' s i d e a :

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Presentation Transcript
f o r c e
F o r c e

A P u s h o r P u l l

F o r c e s c a u s e a c h a n g e i n m o t i o n .

f o r c e1
F o r c e

A r i s t o t l e ' s i d e a :

  • F o r a n o b j e c t t o m o v e a t a c o n s t a n t s p e e d , a c o n s t a n t f o r c e m u s t b e a p p l i e d .
f o r c e2
F o r c e

N e w t o n ' s i d e a :

  • A n o b j e c t m o v i n g a t a c o n s t a n t s p e e d w i l l c o n t i n u e a t t h a t s p e e d w i t h o u t a d d i t i o n a l f o r c e b e i n g a p p l i e d .
b a l a n c e d f o r c e s
B a l a n c e d F o r c e s

F o r c e s t h a t a r e o p p o s i t e i n d i r e c t i o n a n d e q u a l i n s i z e .

u n b a l a n c e d f o r c e s
U n b a l a n c e d F o r c e s

F o r c e s t h a t a r e n o t o p p o s i t e a n d e q u a l .

n e w t o n s 1 s t l a w
N e w t o n ‘ s 1 s t L a w

A n o b j e c t a t r e s t w i l l r e m a i n a t r e s t , a n d a m o v i n g o b j e c t w i l l r e m a i n a t a c o n s t a n t v e l o c i t y u n l e s s u n b a l a n c e d f o r c e s a c t o n i t .

n e w t o n s 2 n d l a w
N e w t o n ‘ s 2 n d L a w

F o r c e =

m a s s X a c c e l e r a t i o n

F = m a

n e w t o n s 3 r d l a w
N e w t o n ‘ s 3 r d L a w

F o r e v e r y a c t i o n , t h e r e i s a n e q u a l a n d o p p o s i t e r e a c t i o n .

f o r c e s t h a t o p p o s e m o t i o n
F o r c e s t h a t O p p o s e M o t i o n
  • S l i d i n g F r i c t i o n : t w o s o l i d s u r f a c e s s l i d e o v e r e a c h o t h e r .
  • R o l l i n g F r i c t i o n : an o b j e c t r o l l s o v e r a s u r f a c e .
  • F l u i d F r i c t i o n : A n o b j e c t m o v e s t h r o u g h a f l u i d .
l u b r i c a n t
L u b r i c a n t

C h a n g e s s l i d i n g f r i c t i o n i n t o f l u i d f r i c t i o n .

f r i c t i o n
F r i c t i o n

I s f r i c t i o n a l w a y s b a d ?

g r a v i t y
G r a v i t y

T h e f o r c e o f a t t r a c t i o n b e t w e e n a l l o b j e c t s i n t h e u n i v e r s e .

a c c e l e r a t i o n o f g r a v i t y
A c c e l e r a t i o n o f G r a v i t y

N e a r t h e s u r f a c e o f t h e e a r t h t h e a c c e l e r a t i o n d u e t o g r a v i t y i s 9 . 8 m / s / s

t e r m i n a l v e l o c i t y
T e r m i n a l V e l o c i t y

T h e f i n a l s p e e d o f a f a l l i n g o b j e c t .

t e r m i n a l v e l o c i t y1
T e r m i n a l V e l o c i t y

A i r r e s i s t a n c e i s o f f s e t t i n g t h e w e i g h t o f t h e o b j e c t .