Force Motion

Page
7

2 meters

8 meters

Mechanical

Advantage= distance

distance

Slide 81

Which of the following is often used as a lever?

file

nail

saw

crowbar

Slide 82

The Wedge

Slide 83

The bottom of this light bulb is an example of what type of simple machine?

a lever

a pulley

a screw

a wedge

Slide 84

What type of simple machine is used to split things apart?

screw

wheel and axle

wedge

inclined plane

Slide 85

What type of simple machine is used to pull a flag up to the top of a flagpole?

screw

wheel and axle

inclined plane

pulley

Slide 86

Pulley Lab

A fixed pulley

B movable pulley

C double pulley (end in top)

D double pulley (end in bottom)

Slide 87

fixed pulley B. movable pulley

C. double pulley (end in top) D. double pulley (end in bottom)

Pulley Lab

Get out your own sheet of paper

1. Write down the force of the weight (newtons).

2. For each pulley system write down the NEW force of the weight.

Pull the string exactly 20 cm.

Write down the distance (cm) that the weight moved.

Calculate the mechanical advantage.

Force of the weight ONLY.

Hook on

Bottom

dude !

DO THIS FIRST!

Slide 88

BIG Teeth=16 small Teeth =8 16:8 2:1

So, the small gear spins TWICE AS FAST as the big gear.

Gear Ratio

Slide 89

calculating

mechanical

Advantage

A 200 pound man lifts a rock weighing 800 pounds by standing on the end of a lever. How much mechanical advantage did the lever provide ?

M.A. = 800 Kg/200 Kg = 4

Slide 90

If you wuz ‘n a

Merry-go-round

& yuz let go,

Which wayz wud yu go?

Slide 91

Centripetal force

The inward force

on a spinning object,

that stops it

from going in

a straight line.

Perpendicular

Slide 92

Centripetal force