Please enable JavaScript.
Coggle requires JavaScript to display documents.
Forces - Coggle Diagram
Forces
Non Contact Forces
Magnetism
DEFINITION: Magnetism is a force you cannot see with your eyes which means it is invisible. Magnets use push and pull as the electrons spin.
FACTS, CHARACTERISTICS, ATTRIBUTES: Magnets have two poles - north and south. The magnetic current moves between the south and north poles. Two south poles do not attract they push away, the same as putting two north poles together, they also push away. If you put a south and north pole (or vice versa) together they attract.
EXAMPLES: Magnetism is used in a fridge door to seal the door. It is also used on an iPad cover so it closes and makes sure it doesn't come open again.
-
Electrostatic
-
FACTS, ATTRIBUTES, CHARACTERISTICS: Two positive electrostatic currents repel each other. Two negatively charged currents also do the same, like a magnet.
EXAMPLE: It is like when you rub your foot on the ground and it gets charged by friction and then if you touch another object the electricity gets transferred into it and as a result of that you get a zap! When you rub a balloon on your head the electrostatic energy makes your hair go up. It stays up until the object loses its electrostatic charge.
-
Gravity
Questions
- What happens when the sun and the planet are further apart?
-
- How does the mass of the sun and the planet affect their motion?
-
-
-
FACTS, ATTRIBUTES, CHARACTERISTICS: The larger the mass of the object the more gravity the object has. Gravity is the force that keeps us standing up on the Earth and not floating away.
EXAMPLES: If you drop a rock towards the ground gravity doesn't just pull the rock down it also pulls the earth up to meet the rock, but the earth doesn't pull up very far at all. Gravity also makes sure that things don't float away ijnto space. It keeps our feet on the ground.
-
extension; Non-contact forces are often described as having a ‘field’ associated with them. What is a field and why is it helpful in understanding non-contact forces?
Gravitational, magnetic and electric fields are helpful for knowing non-contact forces. They call all move things without touching by pushing and pulling. They are all invisible.
.
Contact Forces
Normal
FACTS, CHARACTERISTICS, ATTRIBUTES: The word normal in normal force is not referring to a dictionary its is however referring to the word perpendicular. It means it is standing up on a 90 degree angle like a a bottle on a bench.
EXAMPLES: A book on a table, a box on the floor and a person leaning against a wall are all egs of normal force. The object doesn't fall through the table or floor and you don't fall through the wal.
-
-
Friction
DEFINITION: Friction is the force of two surfaces rubbing together. It is the atoms on the surfaces of the objects that rub together.
FACTS, CHARACTERISTICS AND ATTRIBUTES: Friction can be measured in newtons. It produces heat. The rougher the surface the more friction is produced. Friction slows things down.
EXAMPLE: When I rub my atoms on my hands together friction makes my hands warm. Sliding on a slippery dip, ironing clothes and shoes against the ground are all friction.
-
Pull
DEFINITION: The force of pulling is to move an object closer to yourself or pulling an object to keep another object.
FACTS, ATTRIBUTES, CHARACTERISTICS: Pull is the oppostite force to push.
Questions
- Can you convert a push force into a pull force?
-
- Can a pull force ever be a non-contact force? If so, when?
-
- What mechanical systems use a pull force?
-
EXAMPLE: When we are pulling a rope to keep a block up high or a pulling a bucket of water up out of a well we are using a pulling force. We use pull to open the curtains.
-
Twist
-
FACTS, CHARACTERISTICS, ATTRIBUTES: It is also called torsion. Bridges aren't mean to deal with torsion.
Questions
- Can you convert a push force into a twist force?
-
- What mechanical systems use a twist force?
The drill at the dentist and the pedals on a bike use twist. Pushing on the pedals is the force that crates a spin or twist.
-
EXAMPLE: The force of twisting is used when screwing a jar, opening a lid and turning a door knob. It is also used for can openers, rubics cubes and turning a hair band to put up your hair.
-
Push
-
FACTS, ATTRIBUTES CHARACTERISTICS: If you push something on its sides with too much force sometimes it can break. If you push down and up on a pencil it will break. Push is the opposite to pull.
Questions
- You hit a ball with a bat. What factors will influence how far the ball will go?
What makes the ball go far depends on how hard you hit it and the angle which you hit it. If you hit o=up the ball moves through the air. If you hit down it will go straight down and not go very far at all, unless it rolls. If you hit it hard it will go further because the impact force will be higher therefore pushing the ball further. The softer you hit it the less far it will go because you have put less force into hitting it.
- What mechanical systems use a push force?
Bike pedals use a push force when you apply the force with your foot onto the pedal. Doors use push and pull. My french horn uses a push on the levers and buttons to make the different sounds.
Can a push force ever be a non-contact force? If so, when?
A push force can be a non-contact force. For an example when you two south oles or north poles together on a magnet they repel each other away using a pushing force.
EXAMPLES: Some examples that use push are when you push a door open. You also use push when you are closing a cupboard door, moving something across the floor, pushing a baby stroller or a shopping trolley.
-
