# Friction (#1)

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Science thingy for friction. Don't really know and don't really care

#### Storyboard Text

• ﻿Friction, Gravity, and Elastic Forces 12/11/18 Pd. 2 Chloe, Monica, Dustin, Emanuel and Leslie
• What is friction? Well, that's simple! Friction is a force going the opposite direction of the object's motion. For example, you are pushing a box the right - that is the direction of the motion - and then a person comes and starts pushing it the other way. But... I wonder why things still stop, even if it is on a smooth surface? Well, if you look at a smooth surface under a microscope, you can see that it is not really that smooth. These little bumps are called irregulars. They are also the cause of friction. The strength of the friction all depends on the layout. If a golf ball were to roll across a flat area, it wouldn't stop instantly, because the amount of friction is not great. If there were bumps and corners for the ball to deal with, then it would slow down and stop more quickly.﻿
• ﻿Friction is a force exerted from two objects rubbing against each other. Static friction is friction is friction that acts on an immobile object. Rolling friction is friction that acts on a rolling object. Sliding friction is friction that acts on two flat surfaces. Fluid friction is friction that acts on a object moving through a fluid.
• ﻿Gravity is a force that pulls objects toward each other. The measure of the amount of matter in an object is called mass. Weight is the gravitational force exerted on a person or object on the surface of a planet. Weight is measured in newtons, while mass is measured in kilograms.
• Freefall is when the only force acting on an object is gravity. In free fall, a force of gravity alone causes an object to accelerate in the downward directions. Air resistance acts on objects falling through the air. Air resistance is an upward force exerted on falling objects.
• Rather than dropping a ball straight down, what happens if throw it horizontally?
• So although the ball with initial horizontal velocity will reach a farther distance, the balls drop at the same time.But they will both hit the ground at the same time.
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