Science

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• The buoyant force is stronger on the star than gravity, so that is why the star floats.
• Look at that star. It is floating because of the buoyant force. ﻿
• Gravity Arrow
• Buoyant Arrow﻿
• ﻿Now the star is falling. It is falling because of gravity. Gravity will pull things towards itself, so that is why the star is going downward.
• The force of gravity is stronger than the air friction, so that's why it falls.﻿
• ﻿Gravity Arrow
• ﻿Air Friction Arrow
• ﻿Movement direction of the bus arrow
• Friction Arrow﻿
• ﻿The friction is not very strong, so the bus is still moving
• While that bus is moving, the force of friction is acting on it. Friction always acts in the opposite direction that something is moving in.
• Normal Force Arrow﻿
• ﻿Even though I am standing still, there are still forces acting on me. One such force is normal force. It is the reason I'm not going through the floor right now.
• Because I am standing on a flat surface, the normal force and gravity force are equal in strength.
• ﻿Gravity Arrow
• These particles show us the electrostatic force.﻿
• ﻿Particles with the same charge repel each other, but those with different charges attract. The plus sign represents a positive charge, while the minus sign represents a negative charge.
• ﻿﻿+
• ﻿﻿+
• ﻿
• ﻿﻿+
• -﻿
• ﻿If the lower rubber band is let go of, the rubber band will snap back into it's normal size.
• The upper rubber band currently is not being stretched.  However, the lower one is. That means the lower one has potential elastic energy.
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