Chapter 19:Force and Newton's Laws (Newton's First Law of Motion,…
Chapter 19:Force and Newton's Laws
Newton's First Law of Motion
If the net force acting on an object is zero,the object remains at rest. If the object is already moving it continues to move in a straight line with constant speed
keeps an object at rest
slows down an object that slides
Enables the rolling motion of an object.
Newton's Second Law of Motion
connects force, acceleration, and mass. According to the second law of motion, an object acted upon by a force will accelerate in the direction of the force.
the pull of Earth's Gravity
center of mass
Acceleration equation: a=Fnet/m
If both sides of the equation are multiplied by the mass,the equation can be written as: Fnet=ma
Measured in meters/second²
In order to calculate a force in Newtons from the equation, the mass must be given in: kg, and the acceleration in: m/s²
The force of Gravity exists between any two objects that have mass. Gravity is always attractive and pulls objects downward each other.
Gravity forces will become weaker the farther apart the objects are and decreases as the masses of the objects involved decrease
depends on the mass of objects and the distance between them.
According to Newton's second law, the gravitational force on any object near Earth's surface is: F= mx(9.8 /s²)
the ammount of matter in an object
Weight varies with location. Mass will remain constant.
Newton's Third Law of Motion
According to Newton's third law of motion, forces always act in equal but opposite pairs. Another way of saying this is for every action, there is an equal but opposite reaction. This means that when you push on a wall, the wall pushes back on you with a force equal in strength to the force you exerted.
For every action there is an equal but opposite reaction.
Action Reaction Force
Forces can only cancel if they act on the same object.
Weightlessness is the condition that occurs when the weight of the object seems to be zero.