Rubi Almanza

Writing 116

Professor Kahlert

February 27, 2012

THE APPLICATION OF MOTION IN ONE DIMENSION AND WAVES IN THE GROUND-

PENETRATING RADAR.

PRESENTATION OVERVIEW

• Review information

• Motion in one dimension

• Waves

• Integration of both concepts

• Application to the ground-penetrating radar

• Real-life application

• The simplest form of motion.

• Implies moving in a straight line.

• Velocity

v = d / t

MOTION IN ONE DIMENSION

• A wave is a disturbance that carries energy through matter or space.

• It needs a medium to travel.

• A medium is a substance that has a tendency to return to equilibrium when displaced. It may be a solid, liquid or gas.

• Its velocity depends on the medium.

WAVES

• When a wave is moving through a medium and suddenly encounters a different medium, in which it cannot pass through, it will be reflected back.

• It is similar to a traveling ball hitting a wall.

INTEGRATION OF BOTH CONCEPTS

• By measuring the time it takes the wave to return to the source and knowing its velocity, we can calculate the distance between the source and the new medium.

WHY IS THIS USEFUL?

• The ground-penetrating radar (GPR) is a device used to survey the ground and detect the depth of underground structures.

• It uses electromagnetic waves to find this depth by calculating the distance between the emitting source and the reflective surface.

• Since the velocity of the electromagnetic waves in the primary medium is known, this distance is calculated by using the formula for velocity in one dimension.

APPLICATION TO THE GROUND-PENETRATING RADAR

• In the velocity formula we solve for the distance, and find that

Distance = velocity * time

• For the time value we use only half of the time interval calculated for the wave to come back to the source. Why?

APPLICATION TO THE GPR

• The GRP is used in underground surveys to assess the structure of old bridges.

• This device allows for the evaluation of the stability and durability of these structures.

REAL-LIFE APPLICATION

QUESTIONS?