Unit 2 Flashcards
Newton’s Ist Law
(the law of Inertia): An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force.
Inertia
The tendency of an object to resist changes to its state of motion.
Newtons 2nd Law
The acceleration of an object is produced by a net force acting an it.
The acceleration is proportional to the net force acting
The acceleration is inversely proportional to the mass
Newtons Third Law
for every action there is an equal and opposite reaction
forces come in pairs
Net force and acceleration always go the ——- direction.
Same
Fnormal is the —————- force of the ground on an object
Perpendicular
Balanced Systems: FNET = _ N
a = _ m/s^2
0
0
Mass
the amount of matter (particles) in an obiect, measured in kg. Mass does not vary
Mass
the amount of matter (particles) in an obiect, measured in kg. Mass does not vary
Weight
the gravitational force acting on an object due to its location in a gravitational field, measured in N.
Weight is dependent upon location.
Gravitational field strength
g = 9.8 m/s^2
Gravitational field strength
g = 9.8 m/s^2
You feel ________ as Fnet is smaller
Lighter
You feel ________ as Fnet is larger
Heavier
When moving up (positive) the normal force is
N = ma + mg
when moving down (negative) the normal force is
N= mg - ma
The normal force is called the object’s _____ ________
apparent weight.
Apparent weight =
mass times gravity
Changes to apparent weight:
• Normal weight:
Acceleration = 0
Changes to apparent weight:
When Greater than normal weight:
Acceleration upward
Changes to apparent weight:
• Less than normal weight
Acceleration down
Changes to apparent weight
• Zero weight:
Acceleration = gravity
Gravitational Mass
Measured by comparing the force of gravity of an unknown mass to the force of gravity of a known mass. This is typically done with some sort of balance scale.
Inertial Mass
found by applying a known force to an unknown mass, measuring the acceleration, and applying Newton’s 2nd law (F = ma)
