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Newton’s first law of motion: an object at rest/motion will stay at rest/motion until a force acts on it. Law of Inertia
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Newton’s second law of motion: how much an object accelerates depends on its mass and the force acting on it. F= m/a F m a
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Newton’s third law of motion: Every action has an equal and opposite reaction.
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Newton’s Universal Gravitational Law: gravity is a force of attraction between all matter in the universe
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Newton’s Universal Gravitational Law: force of gravity is equal to the gravitational constant (G) multiplied the mass of the two objects (M,m). Divided by the distance between them squared (d2) Directly Proportional: Mass to Fg Indirectly Proportional: Distance to Fg
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Forces Fg=GMm F=m*a d2 Which formula should we use
to finish our yellow packet?
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Egg Drop Worksheet and Write Up
Lots of unfinished work Why? Yellow Sheets should have been completed, close to completed by Wednesday/Thursday Leaving only lab reports on Friday Let’s correct your C, E, R’s.
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Don’t like your score? Write your lab reports again
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Iffat Sardharwalla March 2010
Forces Only the effect of a force can be seen. Forces are measured in (N) They usually act in pairs (1st Law of motion/ Inertia) They always act in certain direction A newton meter is used to measure forces. Iffat Sardharwalla March 2010
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Iffat Sardharwalla March 2010
Forces Two things make up a force 1. Size: how strong a push or pull is, and 2. Direction: which way it pushes or pulls. We draw forces as arrows The length of the arrow shows how strong the force is 2. Direction it points shows the direction of the force. Iffat Sardharwalla March 2010
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Balanced and Unbalanced Forces
Change the Speed and or Direction of Moving Objects Balanced Forces produce NO change in Movement The forces on the person are balanced The floor pushes upward on the person Gravity pulls downwards on the person Greater Force Smaller Force Iffat Sardharwalla March 2010
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Forces & Movement Forces are nearly always PUSHES and PULLS
Iffat Sardharwalla March 2010
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Forces can make objects do FIVE things
3. Change Direction Like hitting a ball with a bat 2. Slow down Like drag or air resistance Speed up Like kicking a ball 5. Change shape Like stretching, twisting, compressing and bending 4. Turn Like turning a spanner wrench Iffat Sardharwalla March 2010
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http://image. slidesharecdn
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http://physicsprojects. wikispaces
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Update your TOC Work and Simple Machines LT:
What is the definition of work? What are simple machines?
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