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St. Mary's U. Astronomy and Physics Dept.

What crushed this can?

 

 

 

When the can is immersed in the water, the pressure inside the can is lower than the pressure outside

Review

Click on the button and play ... 

 

One of these things
is not like the other!

 

The idea for this game and graphic above come from a great high school physics teacher named Kelly O'Shea.

 

 

 

RollingDown

HaeLim (Emily) Wee , Class of 2017

 

 

 

 

 

 

 


Force on refrigerator acts in 2 directions

 

 

 

 

 

Force acts in 2 directions

 

 

 

 

H. Resolution of Forces - Breaking down a single vector into 2 or more vectors

Drawing Components

[HTML5]

St. Mary's HS Physics

 

 

 

 

 

 

 

 

 

 

 

 

Which component is responsible
for making this cart move?
 

 

 

 

 

Only horizontal part (Fx)
of applied force

 

 

If the angle were increased, how would it change the size of the:

 

Vertical component?    

Increase

 

 

Horizontal component?

 

 

Decrease

 

 

Ex 1) A car is pulled with a force of 60. N at angle of 37° from the horizontal. Find the vertical and horizontal components of the applied force

Scale: 1 cm = 10 N

 

 

 

 

 

 

 

 

 

 


 

 

 

 

Using Trigonometry 

 

 

 

 

 

SinӨ =   Opp = Fy
Hyp F

 

 

Cross Multiply

 

 

Fy = FsinӨ

 

Fx = FcosӨ

 

"One size fits all"

 

 

 

 

 

 

Fy = 60. Nsin37°

 

 

Fy = 36 N Up

 

 

Fx = 60. Ncos37°

 

 

Fx = 48 N Right

 

 

 

Check  a2 + b2 = c2

 

  

36 N2 + 48 N2= 60 N2

 

 

 

 

Ex 2) Weight of Cart = 80 N

 

 

Horizontal Component
of Weight Force?

 

 

 

 

O N 

 

Vertical Component
of Weight Force?

 

 

 

80 N

 

  

 

Horizontal Component

 0 N

 

Vertical Component

80 N down

 

 

 

 

Ex 3) A 50. N force at an angle of 80° has its' angle changed to 10.°. 

 

How will the vertical and horizontal components change?

Angle & Components - Flash

[HTML5]

St. Mary's HS

 

 

 

 


Vertical component - smaller
Horizontal component - larger

 

 


Ranking Rask

Rank the Vertical Components from least to greatest.

 

Explain your answers

 


 

Ex 4) Parallel & perpendicular components

 

 

[ Flash ]    [ HTML5]

St. Mary's H.S. Physics

 

 

 

 

 

 

F = 10. N (Weight)

 

 

 

 


        

F = 10. N (Weight)

 

 

 

Find the force holding cart on ramp and force that acts down

 

Force (down ramp) = Fapplied sinӨ = 5.0 N
Force 
(on ramp) = Fapplied cosӨ = 8.7 N

 

 

Ranking Task

Rank the parallel component
from greatest to smallest

 RankRamp

Rank the perpendicular component
from greatest to smallest

 

 

 

Finding a horizontal component

 

 

 

Dynamics

**AP - **

 

 

 

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