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49 terms

Physics Final

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Force
Any push or pull which can cause something to change it's motion
Motion
A change in position in relation to an object
Frame of Reference
An object or point from which motion is determined
Earth
What is the most common frame of reference?
matter
Inertia is a property of _______.
Inertia
The tendency of an object to resist any change in it's motion.
greater
The greater the mass, the _______ the inertia.
greater
The greater the speed, the ______ the inertia.
Law of Inertia
An object at rest stays at rest. An object in motion stays in motion at a constant velocity unless acted upon by an outside force.
Force
Push or a pull
direction
Force is a vector quantity and requires __________.
newtons
Forces are measured in _________.
Net force
The sum af all forces acting on an object.
balanced, unbalanced
Forces can be ________ or __________.
equal, opposite
Balanced forces are _____ in size and _________ in direction.
not
Unbalanced forces are ____ equal in size and/or direction.
change, motion
No net forces equal no ________ in _________.
constant velocity
EF=0 when an object is at __________ __________.
outside force
If EF=0, then there is no ________ ___________.
Static Equilibrium
Equilibrium for an object at rest.
Dynamic Equilibrium
Equilibrium for a moving object.
Acceleration
Rate of change in velocity
Change in Velocity/Time interval
Equation for acceleration.
m/sec/sec
Units for acceleration
outside force
To cause an acceleration on an object there must be an _______ _______.
Speeding up, Slowing down, and Changing direction
What are the 3 different forms of acceleration?
the net force
Acceleration is a vector quantity and is always in the direction of ____ _______ ________.
Free Fall
Falling without air resistance
gravity
In free fall, _______ is the only force acting upon the object causing the object to change it's velocity.
9.8 m/sec
By how much does an object increase it's speed by in free fall?
mass
The force of gravity experienced by an object is dependent upon the ______ of that object.
same
All objects in free fall have the ______ acceleration.
Mass
Amount of matter in an object
constant
Mass is always ______ at any place at any time.
kg
Mass is measured in ___ .
balance
Mass is measured using a ____________.
Weight
Force which a given mass feels due to the gravity at it's place.
gravity
Weight depends on the ________ of the place.
N
Weight is measured in __.
scale
Weight is measured using a ______.
Air Resistance
The result of collions of the objects' leading surface with air molecules.
surface area, speed
Air Drag depends on ________ ______ & _________.
Pressure
The force per unit area that is exerted on an object.
force/area
Formula for pressure?
N/cm/cm
Units for pressure?
Barometer
Used to measure atomospheric pressure.
Buoyancy
Force of a fluid that pushes upon an object.
Archimedes Principle
The buoyant force on an object is equal to the weight of the fluid displaced by the object.
Bernoulli's Principle
The pressure in a moving stream of fluid is less than the pressure in the surrounding fluid.