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Force and Effects - Coggle Diagram
Force and Effects
Force Interactions
A force is a push or pull. In every day language, we might use the words tug or yank instead of pull and shove or hit instead of push. In scientific language these are all forces
If you push a toy car, it will speed up. When you catch a ball you slow it down and bring it to a stop. When you play with a yoyo, you tug as it reaches the bottom of the string to make it change it change direction. When you play with modelling clay, your pushes and pulls make it change shape. The same happens if you stretch a rubber band, or sit on a space hopper- one stretches and the other squashes.
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You cannot throw a ball unless your hand actually touches it, but the gravity will pull it downwards even if its in midair. The push of your hand is a contact force, whereas the pull of gravity is a non-contact force.
If we took a really powerful microscope and looked at a ball, it will show us the individual atoms on its surface. When you pick up the ball, the atoms on the surface of your hand come close to the surface atoms of the ball. The outer layer of every atom is made of negatively charged electrons, which repel (push away from) each other. The ball pushes on your fingers and your fingers push on the ball. So even contact forces are actually due to the non-contact electrostatic force between electrons.
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