Forces

Rule: When naming a force, you must describe the object giving the force and the object receiving the force.

Original statement: Force an object to accelerate, a force needs to be applied.

Second statement: In order for an object to accelerate, an unequal force needs to be applied.

If an object is either moving in constant motion or is not moving at all, then the force diagram is 2 equivalent vectors with force earth pointing down and force normal (ground, floor) is pointing perpendicular from the plane.

If the object is accelerating, then there is an odd number of forces (ex. 2 equal forces and a third force) or a pair of forces is unequal.

CORRECTIONS: (UNIT 3 TEST)
*Do not forget fence method! example: 5secs in motion= 6 dots and 5 vectors
*Acc vectors are placed on the same dot
*Dots on motion map can equal more than 1 unit of time. It can be each dot equals 2 secs too
* Use "midpoint method"(the notes are in notebook!) on curved X vs T graph to find instantaneous velocity

FORCE DIAGRAMS:
*Constant vectors= object has stopped or has constant motion NO ACCELERATION
*Direction of Force Ground is perpendicular to the ground
*Raising an object up (raising the bucket from the well) in a constant motion is CONSTANT
(refer to notes in packets)

FORCE TABLE:
*100grams= 1 Newton
*Steps to solve;
 #1 make a vector diagram of the forces in the direction of the given angles
 #2 use trig to find the displanement and angle
*Add 180 degrees to find the opposite force

FORCES:
*Objects ALWAYS put the same amount of force when they hit each other
(ex. a small car and a truck put the same amount of force on each other when they crash)
*Newtons multiplied by 100 = the gram weight
*100g= 1N
*1kg= 10N
*Situation: I am holding a 500g weight. The earth pulls on it with 5N and I pull up 5N. I set it on a table. The table pushes up 5N and the earth pulls down 5N. I lift 2N. Now, I lift 2N, the table pushes up 3N and the earth still pulls 5N.

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