Long 50slideschapter 5 motion notes [autosaved]

Ch. 5 Motion & Forces ,[object Object],[object Object]

A. Motion ,[object Object],[object Object],[object Object],[object Object]

A. Motion ,[object Object],[object Object],Reference point Motion

A. Motion ,[object Object],[object Object],[object Object]

A. Force ,[object Object],[object Object],[object Object],F kick F grav

A. Force ,[object Object],[object Object],[object Object]

A. Force ,[object Object],[object Object],[object Object],F friction W F pull F net N N

B. Gravity ,[object Object],[object Object],[object Object],[object Object],[object Object]

B. Gravity ,[object Object],[object Object],less distance more mass

B. Gravity ,[object Object],[object Object],MASS always the same (kg) WEIGHT depends on gravity (N) W = mg W : weight (N) m : mass (kg) g : acceleration due to gravity (m/s 2 )

B. Gravity ,[object Object],[object Object],[object Object],Animation from “ Multimedia Physics Studios .” elephant feather

Newton’s First Law ,[object Object],[object Object],motion constant velocity net force

B. Newton’s First Law ,[object Object],[object Object],[object Object],[object Object],[object Object]

ConcepTest 2 ,[object Object],[object Object],[object Object]

ConcepTest 2 ,[object Object],[object Object],[object Object],[object Object],2. Starting at the time of collision, the door exerts a leftward force on you.

What is a Force? ,[object Object],[object Object]

Unbalanced and Balanced Forces ,[object Object],[object Object]

C. Friction ,[object Object],[object Object],[object Object],[object Object],[object Object]

C. Friction ,[object Object],[object Object],[object Object],[object Object]

Types of Friction ,[object Object],[object Object],[object Object],[object Object]

Newton’s Second Law ,[object Object],[object Object],[object Object]

B. Speed & Velocity ,[object Object],[object Object],[object Object],v d t

B. Speed & Velocity ,[object Object],[object Object],[object Object]

C. Acceleration ,[object Object],[object Object],[object Object],a : acceleration v f : final velocity v i : initial velocity t : time a v f - v i t

D. Calculations ,[object Object],GIVEN: d = 100 m t = 20 s v = ? WORK : v = d ÷ t v = (100 m) ÷ (20 s) v = 5 m/s You skate faster! v d t

D. Calculations ,[object Object],GIVEN: v i = 10 m/s t = 3 s v f = 32 m/s a = ? WORK : a = ( v f - v i ) ÷ t a = (32m/s - 10m/s) ÷ (3s) a = 22 m/s ÷ 3 s a = 7.3 m/s 2 a v f - v i t

D. Calculations ,[object Object],GIVEN: v = 330 m/s d = 1km = 1000m t = ? WORK : t = d ÷ v t = (1000 m) ÷ (330 m/s) t = 3.03 s v d t

D. Calculations ,[object Object],GIVEN: t = ? v i = 30 m/s v f = 0 m/s a = -3 m/s 2 WORK : t = ( v f - v i ) ÷ a t = (0m/s-30m/s)÷(-3m/s 2 ) t = -30 m/s ÷ -3m/s 2 t = 10 s a v f - v i t

D. Calculations ,[object Object],GIVEN: F = ? m = 40 kg a = 4 m/s 2 WORK : F = ma F = (40 kg)(4 m/s 2 ) F = 160 N m F a

D. Calculations ,[object Object],GIVEN: m = 4.0 kg F = 30 N a = ? WORK : a = F ÷ m a = (30 N) ÷ (4.0 kg) a = 7.5 m/s 2 m F a

D. Calculations ,[object Object],GIVEN: F(W) = 557 N m = ? a( g ) = 9.8 m/s 2 WORK : m = F ÷ a m = (557 N) ÷ (9.8 m/s 2 ) m = 56.8 kg m F a

ConcepTest ,[object Object],[object Object],[object Object]

A. Newton’s Third Law ,[object Object],[object Object]

A. Newton’s Third Law ,[object Object],[object Object],[object Object],NO!!!

A. Newton’s Third Law ,[object Object],[object Object],[object Object],[object Object]

A. Newton’s Third Law ,[object Object],[object Object],[object Object]

A. Newton’s Third Law ,[object Object],[object Object],[object Object],F G F R

A. Newton’s Third Law ,[object Object],[object Object],[object Object],[object Object],[object Object],F m

E. Graphing Motion ,[object Object],[object Object],[object Object],[object Object],faster speed constant speed no motion speed Distance-Time Graph A B

E. Graphing Motion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Distance-Time Graph A B

E. Graphing Motion ,[object Object],[object Object],Distance-Time Graph

E. Graphing Motion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],constant accel. no accel. (constant velocity) Speed-Time Graph

E. Graphing Motion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Speed-Time Graph

B. Momentum ,[object Object],[object Object],p = mv p : momentum (kg ·m/s) m : mass (kg) v : velocity (m/s) m p v

B. Momentum ,[object Object],GIVEN: p = ? m = 280 kg v = 3.2 m/s WORK : p = mv p = (280 kg)(3.2 m/s) p = 896 kg·m/s m p v

B. Momentum ,[object Object],GIVEN: p = 675 kg·m/s m = 300 kg v = ? WORK : v = p ÷ m v = (675 kg·m/s)÷(300 kg) v = 2.25 m/s m p v

C. Conservation of Momentum ,[object Object],[object Object],p before = p after

C. Conservation of Momentum ,[object Object],BEFORE Cart 1 : m = 5 kg v = 4.2 m/s Cart 2 : m = 2 kg v = 0 m/s AFTER Cart 1 + 2 : m = 7 kg v = ? p = 21 kg·m/s p = 0 p before = 21 kg·m/s p after = 21 kg·m/s v = p ÷ m v = (21 kg·m/s) ÷ (7 kg) v = 3 m/s m p v

C. Conservation of Momentum ,[object Object],BEFORE Clown : m = 50 kg v = 0 m/s Cannon : m = 250 kg v = 0 m/s AFTER Clown : m = 50 kg v = 20 m/s Cannon : m = 250 kg v = ? m/s p = 0 p = 0 p before = 0 p = 1000 kg·m/s p after = 0 p = -1000 kg·m/s

C. Conservation of Momentum ,[object Object],GIVEN: p = -1000 kg·m/s m = 250 kg v = ? WORK : v = p ÷ m v = (-1000 kg·m/s)÷(250 kg) v = - 4 m/s (4 m/s backwards) m p v

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Long 50slideschapter 5 motion notes [autosaved]

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