I’m reading a great book on anti-gravity. I can’t put it down.

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Presentation transcript:

I’m reading a great book on anti-gravity. I can’t put it down.

Force

Net Force The combination of all forces acting on an object If equal and opposite forces act on an object, there is no net force. – If an object is not moving and you and a friend both push on the object with the same force from opposite directions, the object will not move

Force is a vector Force vectors can be added in the same way as velocity vectors 5 N 25 N36 N 12 N 20 N 24 N

Equilibrium What force acts on your notebook when it sits on the table? The books weight pushes it down, but the normal force (or support force) of the table pushes it back up The table pushes up with the same force that the book pushes down

When there is no net force the forces are in equilibrium – All forces in opposite directions are equal to one another Objects that are at rest are in equilibrium, there are forces acting on them, but there is no net force

Tension Force In normal force, the force is created by the atoms becoming compressed If you are hanging by a rope, the atoms are stretched apart, creating a tension force. This force is equal and opposite of your weight, thus you hang motionless.

Friction Friction always acts opposite of the direction of applied force When two solid objects come into contact, friction occurs from the irregularities on the objects surfaces rubbing against each other Not limited to solid objects – Air resistance is a type of friction

Free Body Diagrams A diagram that shows all of the forces acting on an object W=mg FNFN Applied force Force due to Friction

Applying Force- Pressure

Force and acceleration Force causes acceleration Any time there is a net force, the object will move Acceleration is directly proportional to the net force – i.e. the more net force, the higher the acceleration

Mass resists acceleration Acceleration is inversely proportional to the objects mass – Bigger mass= less acceleration, if the object has the same net force acting on it

Newton’s second law Newton was the first to notice that acceleration is dependent on net force and the mass of an object His second law states: The acceleration produced by a net force of an object is directly proportional to the magnitude of the net force, is in the same direction as net force, and is inversely proportional to the mass of an object

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