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49 terms

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.