Copy Page 74 Objective: Home work: Students will be able to identify and explain different types of forces and its interactions in various scenarios Home work: -Gravity Car Due Mon/Tue -Finish Carnival of Forces due Monday/Tuesday -Bridge Lab due friday

Warm up 10/14-15 Solve and label the type of force

Buoyancy George: “Pennywise, Do they float?” IT: “Oh yes Gorgey they float, everything floats down here...”

Displace Spreading out and taking the place of something

Buoyant Force Upward force that fluids exert on all matter

How it works Water pressure on all sides of the object. 2. Forces on sides are equal and balanced

How it Works pt 2 3. Pressure however increases as it sinks down making the downward force less than the upward force displacing it. 4. Upward force is greater and may be enough for the object to float instead of sink

Archimedes Principle Buoyant Force on an object is equal to the weight of displaced water

Weight and Displacement -Weight > buoyant force = sinks -Objects will only float if it displaces a volume of liquid that has a weight equal to the object weight -buoyant force opposes gravity

Answer in your notes: SINK OR FLOAT -Duck’s downward force is 9N, buoyant force = 9N ______________ -Fish weight = 12N, Buoyant force = 12 N ____________ -Rock weight - 75 N, Buoyant force = 50 N __________________

Pressure -the amount of force exerted on a given area

Water Pressure -The lower you go the more pressure because of gravity -water is more dense than air

Air Pressure -Higher you go the less it gets -Gravity pulls down molecules. -As you travel between heights your body adjusts to pressure

Pascal's Principle and fluid -Pressure change in an enclosed fluid will be transmitted equally throughout that fluid -Fluid is compressed down a tube to a brake line with enough pressure to stop your tires from spinning braking the car