# Homework

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• Friction and what causes it.﻿
• ﻿Did you know friction is when two substances rub against each other. But normally smooth surfaces produce less friction and rough surfaces produce rough surfaces
• static friction is the friction that acts on nonmoving objects ﻿
• rolling friction is when something is rolling on a ﻿surface
• Did you know that fluid friction is when a substance moves in the water
• sliding friction is when two solid surfaces slide over each other ﻿
• Did you know that Gravity is the force by which a planet or other body draws objects towards the center.﻿
• Weigh= Mass X Acceleration due to Graity﻿
• ﻿Did you know that weight is a measure of how much gravity pull on a mas or object. The SI Unit for weight is Newton
• Do you know what acts upon Gravity and Motion, more like free fall and air resistance?﻿
• Free Fall is when an object goes straight to the ground﻿
• Air Resistance is a force that is caused by air﻿
• Examples: - Free Fall: lets say you are holding a ball, it will fall straight down to the ground﻿
• Examples:  - lets say you go skydiving, air resistance is acting upon when your body by gravity
• - Projectile:﻿ Occurs when an object is thrown - Compression: An elastic force that squeezes or pushes matter together
• ﻿You are probably wondering what compression and projectile mean?
• ﻿- Matter is considered elastic if it returns to its original shape after it is squeezed or stretched -Tension: An elastic force that stretches or pulls matter
• ﻿Do you guys know why tension is caused?
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