Forces
Non-Contact
Contact forces
push
pull
twist
normal force
friction
gravity
magnetism
electrostatic
One object moving another object through contact towards themselves.
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The heavy the object is the harder it is to pull.
pulling a rope in tug of war
The harder you twist on the lid on a jar the harder it is to twist off
One thing causing another to rotate around a stationary point
Opening a jam jar by twisting
one moving another with contact forces
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pushing a chair under a table
the heavier the item the harder it is to push
C. experiment 1 pushing down the Plasticine
C. experiment 1 blowing through a straw to move a table tennis ball
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C. experiment 1 use a magnet to pull something
friction is the force between two surfaces sliding, or trying to slide across each other. friction always works oppositely to the way your pushing/pulling.
pushing a chair on a carpet.
Magnetism is the force that the magnetic object has to. they can pull objects towards them if said objects are magnetic. Only specific objects are magnetic. Magnets have a North and a South side. When you try to put two of the same sides together they repel but opposite sides attract.
using a magnet to pull paper clips
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The rougher the surface the more friction there will be when an object is being moved.
Normal force is the force that counters gravity while the object is on a surface that can withstand it's weight so the force becomes balanced and the object doesn't move
Facts: If the object you are standing on isn't strong enough it will break and you will fall.
Example: standing on the floor boards. The floor boards create an even force which means you don't fall towards the core of the earth.
All objects have gravity. Gravity is the force of two objects moving closer towards each other.
The reason when you jump the earth doesn't move towards you is that the earth has much more mass meaning that it will barely moves at all because the formula for gravity is distance times mass.
Example: when you drop a ball it falls towards the earth
Electrostatic force is a non-contact force that can either attract(pull) or repel (push). Sometimes this is called static electricity. It is caused by objects that are electrically charged exerting a force on each other.
Rubbing a balloon on your hair
When two objects are rubbed together the friction can cause the negative particles from one object to stick to the other.
E is located on Onenote