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Forces - Coggle Diagram
Forces
Motion
Speed: fast or slow
Time: long or short
DST triangle
SI unit:m/s
km/h usually for vehicles on the road
Measure how fast smt moves
Pressure
Amount of force acting on a unit area is known as pressure
Affected by Force and Area
Reduce surface area= Increase pressure
Increase force= Increase pressure
Can be calculated
Force divide by Area
Liquid and gases have Pressure also
Liquid
As we go lower in the sea, water pressure increase
Gases
As we climb mountains or on a plane, air pressure decreases
Lower gas pressure causes compression
Suction cup. We push the suction cup, air pushed out from under the cup. Air pressure under cup decreases. Higher air pressure outside holds it on wall.
Unit: newton per square metre (N/m2)
Effects
Change direction
Change shape and shape
Change motion
Start a Obj moving
Stop a moving Obh
Speed
Can bring turning effect. Device that turns when force exerted is called lever
Fulcrum
e.g. Elbow
Destructive Forces of Nature
Volcano
Earth crust is hot liquid rock (magma). When pressure too great, magma forced upwards to surface through a hole in earth surface called volcano. When reaches surface, it's called lava (mixture of ash and mud (mixture of ash and water)). Can burn forest and bury fields or even towns
Tsunamis
Large ocean waves caused by powerful earthquake. Can reach heights of more than 30m, causing lots of damage when they crash onshore.
Earthquake
When plates meet, push against each other with great force. This causes great damage
Typhoons
Powerful storms with strong winds and heavy rain. Speed of wind can exceed 200/h. Rain and force of the wind can damage property and cause floods
Measurement
Extention
Compression
Unit: Newtons (N)
Types
Non- contact= act from a distance
Gravity
Aka Gravitational force
Gravity on moon is 1/6 of gravity on earth
Moon gravity can affect Earth. Therefore, causing tides.
Weight is used to measure force of gravity
Weight not equals mass. Weight can change in different gravity
Magnetism
Aka magnetic force or magnetism
Acts from a distance
Opposite poles attract. Similar poles repel.
Contact= acts when objs touch
Friction
Opposes movement of an object
Creates heat
Found in solid, liquid and gas
CONs
Wear materials away
Movement is more difficult
PROs
Brakes slow bicycle down
Allow skateboarders to move (need to use the floor to move)
Allow us to write
How to reduce
Ball bearing
Lubricants
Oil
Grease
Streamline body
Fish
Aircrafts
Definition
Push or Pull interaction btw objs
Pull
Stretching
Both
Twisting
Push
Kicking
Change state of rest or motion
Exert a force
