41 terms

Acceleration

The rate at which velocity is changing. The change may be in magnitude, direction or both.

Average Speed

Path distance divided by time interval.

Elapsed Time

the time that has passed since the beginning of an event.

Free Fall

Motion under the influence of gravity, alone

Instantaneous Speed

Speed at any instant of time

Rate

In physics, how fast something happens, or how much something changes per unit time.

Relative

Regarded in relation to something else. Depends on point of view, or frame of reference

Speed

How fast something is moving. The path distance moved per unit time. The magnitude of the velocity vector.

Velocity

Speed with a specification of its direction of motion.

Scalar Quantity

any quantity that is described by magnitude alone, without direction

Vector Quantity

Any quantity that is described by magnitude and direction

Distance

The total "path" length traveled, regardless of direction

Displacement

The distance which seperates the ending point and starting point of a "path", inclusive of direction

Constant Velocity

Constant speed with constant direction. ("Constant speed in a straight line path")

vacuum

an area completely devoid of matter, and therefore no air resistance

gravity

the force that accelerates a body toward the center of the Earth at a rate of 10 m/s/s (10 meters per second squared)

Abutments

the substructure at the end of a bridge span whereon the bridge's superstructure rests. The "legs" or "feet" of a bridge

Load

forces which are applied to a structure. The weight a structure must hold

Roadbed

The foundation and surface of a road

Preventative Maintenance

Maintenance, including tests, measurements, adjustments, and parts replacement, performed specifically to prevent faults from occurring.

Dissipation

the spreading out of a force over a large area so that one spot doesn't bear the brunt of the concentrated force

Transference

the movement of forces from an area of weakness to an area of strength that is designed to handle the force

Torsion

"Twisting Force"

Constant Speed

the rate of change of position in which the same distance is traveled each second

Compression

A force that pushes on or squeezes a material.

Efficiency

The percentage of the input work that is converted to output work

Trusses

triangular framework used to span or support

Scalar Quantity

What type of quantity is speed

Vector Quantity

What type of quantity is velocity

Vector Quantity

What type of quantity is displacement

Scalar Quantity

What type of quantity is distance

Displacement

What can never be larger than the distance traveled

meters per second (m/s)

unit for speed

Speedometer

What tells you the instantaneous speed of a car?

Magnitude

An instantaneous speed of the vector quantity of velocity is

Inclined Planes

Acceleration was formulated by Galileo based on his experiments with

When there is no air resistance

When do all objects fall at the same unchanging acceleration

10m/s

Objects in free fall acceleration at a rate of

G

When in free fall replace acceleration with this that is equal to 10 m/s

5 meters

How long does an object fall the first second of the fall

Velocity

An object can accelerate while traveling at constant speed but not at constant _________________. This is because acceleration is a measure of the change in _____________ over time. Therefore, at a constant speed (meaning no change in the magnitude of the velocity) an object could be changing its direction, and thus, accelerating.