SECT. 3-A POSITION, VELOCITY, AND ACCELERATION. Position function - gives the location of an object at time t, usually s(t), x(t) or y(t) Velocity - The.

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Presentation transcript:

SECT. 3-A POSITION, VELOCITY, AND ACCELERATION

Position function - gives the location of an object at time t, usually s(t), x(t) or y(t) Velocity - The rate of change( derivative) of position, usually v(t) Acceleration - The rate of change ( derivative) of velocity usually a(t) Average velocity -

1) If find v(t) and a(t).

2) The position of a particle moving along the x - axis at time t is given by. Find the particles velocity and acceleration at t = 5. Velocity Acceleration

Speed – The absolute value of velocity otherwise known as the magnitude of velocity

Velocity Positive - the particle is moving to the right Negative - the particle is moving to the left Zero - the particle has momentarily stopped or is changing direction ( must have a sign change)

3) Find where the object changes direction if Find where v(t) = 0 interval time V(t) Result

Acceleration and Velocity If the sign of acceleration is the same as velocity, the speed of the particle is ______________ (the two are working together) If the sign of the acceleration is opposite that of velocity, the speed of the particle is _________________ (the two are working against each other)

4) Given the same position function as #3 find the interval during which the particle is slowing down. Interval t velocity acceleration result

5) Given find the interval during which the particle is speeding up. Interval t velocity acceleration result

Distance vs. Displacement Displacement- change in position ( final position minus original position) Distance- the total distance travelled by an object in the time interval even if duplicated

6) Find the DISTANCE traveled by the particle whose position is given by on the interval (0,4). Distance NOT displacement!! Consider two intervals

7) If a) find the DISTANCE traveled by the particle on the interval (2,4). b) Find the DISPLACEMENT on the interval (1,5)

8) The graph shows the position function of a radio controlled car a) Was the car going faster at B or at C? b) When was the car stopped? c) At which point was the car’s velocity the greatest? d) At which point was the car’s speed decreasing?

Homework PVA Worksheet and worksheet 3-A