PS ~ CH 11 & 12 More forces and Physics stuff!

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Presentation transcript:

PS ~ CH 11 & 12 More forces and Physics stuff!

Practice problem #3: A man has a mass of 80.0 kg: 1)What is the man’s weight on Earth if acceleration due to gravity is 9.8 m/s 2 ? 2)What is the man’s weight on the moon if acceleration due to gravity on the moon is 1.67 m/s 2 ? 3)What is the man’s weight on Mars where the acceleration due to gravity is 3.7 m/s 2 ? Don’t forget this equation-  W = m g =

Free-fall – an object is in free-fall when the ONLY force acting on the falling object is gravity Huh??? But, when things fall to the ground on earth there is always the force of air resistance( click here ) pushing up on them!!!air resistance( click here ) –What are two things that will cause click here -  air resistance to increase?(Read carefully!) air resistance So, when an object is TRULY in free-fall the object has to be in space or in a click here -  vacuum. vacuum

Terminal velocity –when the force of gravity on a falling object equals the force of air resistance – the object will fall at a constant velocity –How does this website define(click on this link) terminal velocity?terminal velocity –Click here to watch a short clip about terminal velocity ( put in your headphones!)Click here to watch a short clip about terminal velocity –Click here to watch another short clip about terminal velocity. ( put in your headphones!)Click here to watch another short clip about terminal velocity.

Newton’s law of universal gravitation – all objects in the universe attract each other by the force of gravity. –more mass more force, less mass less force –larger distance less force, smaller distance more force –EX: gravitational force holds planets, stars, galaxies together –Newton’s Universal law of Gravitation- video clip- click hereNewton’s Universal law of Gravitation- video clip- click here –Click here to find out what type of math Sir Isaac Newton discovered( scroll down to the bottom)!Click here to find out what type of math Sir Isaac Newton discovered( scroll down to the bottom)! Click here for another short clip on some the things you just learned( this video will stop half way through--- that’s OK… just stop watching when the website shuts it off)Click here for another short clip on some the things you just learned

What is a projectile? Click here to find out!What is a projectile? Click here to find out! Watch this video and answer questions ( check the volume icon on the video…you may need to turn it down!Watch this video and answer questions What is uniform circular motion and centripetal acceleration? Click here to find out!What is uniform circular motion and centripetal acceleration? Click here to find out!