Newton's Laws Notes(for quiz 5/16)(let me know if you find a spelling error...I will change it!)
1.) Nature of Force
-Like velocityand acceleration, a force is described by its STRENGTH and by the DIRECTION in which it acts.
-Unbalanced forces acting on an object result in a net force and cause a change in the object's motion.
-Balanced forces acting on an object do not change the object's motion.
2.) Friction and Gravity
-The strength of the force of friction depends on two factors: how hard the surfaces push together and the types of surfaces involved.
-Two factors affect the gravitational attraction between objects: MASS and DISTANCE.
-In free fall, the force of gravity is an unbalanced force, which causes an object to accelerate.
3.) Newton's First and Second Law
-An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted on by a force.
-Acceleration depends on the object's mass and on the net force acting on the object.
-Force = Mass x Velocity
4.) Newton's Third Law
-If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.
-The momentum of a moving object is equal to its mass times it's velocity.
Momentum = Mass x Velocity-The total momentum of any group of objects remains the same, or is conserved, unless outside forces act on the objects.
5.) Rockets and Satellites
-A rocket can rise into the air because the gases it expels with a downward action force exert an equal but opposite reaction force on the rocket.
-Satellites in orbit aroudn Earth continuously fall toward Earth, but because Earth is curved they travel around it.
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