Please enable JavaScript.
Coggle requires JavaScript to display documents.
Forces, Unbalanced Forces, Balanced Forces - Coggle Diagram
Forces
Contact Forces
Push
To push is a contact force where the force is going towards the object moving it in the opposite direction that the force is going.
When you push on a brittle substance with large amounts of pressure it will shatter but pushing on a squishy substance will change its shape.
Example: To push on a piece of soft dough will change its shape but pushing on a piece of glass will cause it to shatter the pressure
-
Pressure
-
The more pressure you put in one area the more the force is concentrated, but when you put the same amount of force in a bigger area the force will spread out and not be concentrated.
Example: putting 200n on a piece of bread with a knife will concentrate the force into the surface of the knife that the pressure is being transferred, that surface is incredibly small so this is why the force is concentrated. Putting the same amount of pressure with a teacup on the same piece of bread will mean that the force will spread out across the large area where the pushing force is being transferred.
-
Pull
-
When you have an object in your hands and pull both sides in opposite directions, depending on the substance, it is less substantial in mass it might break.
Example: Get a thin piece of string and pull each side of it in opposite directions. You will see the string straighten because it is under tension.
-
Twist
When two sides of a solid substance rotates around the middle stationary point hence the twisting motion. The object is basically curling out of it's original shape.
Twisting an object that holds water within itself will force the water out because the object is being pushed into itself essentially and there will be no room for water to be.
Example: Holding two sides of a wet cloth and will one hand pulling towards yourself and the other away will be twisting motion.
-
Friction
Friction is when two solid substances rub together producing heat. The more contact there is between objects, the more friction can occur
-
Example: Rubbing two sticks together will occasionally cause enough heat to start a fire. A plane taking off from the runway will be going so fast that the wheels on the plane rubbing against the runway will start to wear
-
Wind Resistance
-
The more mass an object holds or the less surface area that is facing the ground it has the less the wind resistance will be. If an object is lighter with more surface area facing the ground it will fall slower due to the increased wind resistance.
Example: A feather has more wind resistance than a bowling ball because of it's lighter mass, take away the oxygen though, the feather and the bowling ball will fall at the same rate because without oxygen, there is no wind resistance at all.
-
'Normal' Forces
-
Example: If a person pushes on the wall of the building the building will stay put but if there were no normal force the whole building would move because there would be no other force acting against the pushing force.
If two objects come into contact, they are capable of making a normal force occur. If this does force did not happen, the only force that would be acting on us would be gravity and we would sink into the earth. A normal force is the force that acts against any contact force to keep an object where it is.
Non-Contact
Gravity
Gravity is a density that a solid object holds and our earth has a strong amount of gravity which holds us to the surface.
The more mass that an object holds the more gravity it has. Take the sun for example it has so much gravity that it pulls the earth and the planets surrounding it into a continual orbit.
Example: Earth is an example of something with a lot of gravity, that is what keeps us on the ground. Planets like Jupiter have heaps of gravity which makes it hard to move if you were on that planet because all that gravity is pulling you down making you feel heavier.
-
Electrostatic
Electrostatic forces are made by electric charges from both positive and negative charged particles.
Electrostatic sends currents of electricity through the air otherwise known as static electricity. Some forces like the one between an electron and a proton make up a hydrogen atom and this can be a very strong electrostatic force
Example: rubbing a balloon on one's head creates static electricity, a simple form of electrostatic force, this works because the electrons are jumping from one surface to another and there is an unbalance of electric force hence the build up of charge.
Magnetic
-
Each magnetic substance has either positive or negative charged molecules and positive ones will attract to negative ones and vice versa.
Example: If two negative molecules touch they will repel away from each other same goes with the positive charged molecules.
-
Unbalanced Forces
-
If an unbalanced force acts on a moving object the object will move in the direction or against the strongest force depending on if it is push or pull.
A balancing force is where two forces either compression or tension act on an object and if the force is balanced it will stay stationary if not it will move.
Example: If a stationary stack of tennis balls is acted on by an unbalanced force they will start moving.
-
Balanced Forces
If two amounts of pressure are the same on an object it will stay stationary or if it is moving it will continue moving at the same speed, this is a balanced force
Unbalanced forces change the way an object moves or if it moves or not but balanced forces are the opposite and will keep the object moving at the same speed or keep it stationary.
Example: If tow amounts of equal pressure act on a stationary car, the car will stay stationary, but if it is moving, it will continue moving at the same speed.
-
-
