Test Review:
Forces & Motion
Ms. Sulik
Today’s Class
 Finish notes on transformation of motion
 Review for test (quickly go over topics)
 Kahoot!
Types of Motion
Types of Motion
There are 4 types of motion:
Rectilinear
Alternating
Circular
Oscillatory
What type of
motion is this?
Transmissions of Motion
Name the motion transmission mechanism
Chain and Sprocket
Belt and Pulley
Gears
Friction Wheels
Pulley Systems
Transformation of
Motion
Transformation of motion
You can change one type of motion into
another
 For example: pinwheels transform circular
motion into linear motion
Other Systems
Rod and Crank
 Changes circular motion into alternating motion
Other Systems
Cam and Follower
 Changes circular motion into alternating motion
Other Systems
Rack and Pinion
 Changes circular motion to rectilinear motion
 You turn the focus knob and the lenses go up
and down on the microscope.
Other Systems
Screw and Nut
 This changes circular into rectilinear motion.
Law of Conservation of
Energy
What is the Law of Conservation of
Energy?
Energy can never be created nor
destroyed but only ever changed
from one form into another
What is Energy?
The ability to do work!
Types of Energy
 Kinetic:
 Radiant (light)
 Magnetic
 Electrical
 Thermal (heat)
 Acoustic
 Gravitational
 Potential:
 Elastic
 Nuclear
 Chemical
Forces
What is a Force?
A mechanical action that sets an object in
motion or deforms it
A force is a push or a pull
 This includes twisting
Common Forces
 Gravity
The force that pulls us towards the centre of
the Earth
 Friction
The force that resists the movement of
objects sliding against each other
 E.g. air hockey table -> very little friction
 Buoyancy
The force that pushes up on objects in water
causing them to float
What are the 5 types of forces?
1.
2.
3.
4.
5.
Flexion
Tension
Compression
Torsion
Shearing
Flexion
Force that tends to bend a material
Tension
Force that tends to stretch a material
Compression
Force that tends to crush a material
Torsion
Force that tends to twist a material
Shearing
Force that tends to cut or rip a
material
Simple Machines
Levers
A beam (or plank) pivoted on a
fulcrum (pivot point)
Lever Classes
What class lever is this?
Inclined Plane
Any slope or ramp that makes it easier to
lift something
Wedge
Made of two inclined planes and used to push
apart two objects – turns a downward force into
an outward force
Pulleys
Uses wheels and a rope to raise/lower
objects or move a load
Wheel & Axle
Composed of a wheel and an axle (a bar
around which the wheel rotates)
Screw
An inclined plane wrapped into a spiral
Name that Simple Machine!
Name that Simple Machine!
Inclined plane!
Name that Simple Machine!
Wedge!
Name that Simple Machine!
Lever!
(3rd class)
Name that Simple Machine!
Screw!
Name that Simple Machine!
Wheel & axle!
Name that Simple Machine!
Lever!
1st class
Name that Simple Machine!
Lever!
(2nd class)