Translational Motion

Question 1

Terminal Velocity (Vt) Question: Define Vt.

Answer 1

the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.

Question 2

Vt = sqrt(2mg/CpA). Given every other variable is the same, is an ice cube more aerodynamic than an ice sphere.

Answer 2

The sphere is the shape with minimal surface area among all bodies of the same volume. A cube has more SA, so it experiences greater resistive force when moving through air.

Question 3

A greater initial velocity causes the object to reach terminal velocity in a (shorter/longer) time, and it also (increases, decreases, doesn’t have an effect) on the final Vt.

Answer 3

Shorter; doesn’t change Vt.

Question 4

Define viscosity.

Answer 4

Resistance to flow. More resistance causes an object to move more slowly.

Question 5

Analyzing graphs….in nature graphs tend to look: linear, or exponential?

Answer 5

Linear changes implies abruptness. Most things in nature happen smoothly.

Question 6

An object that drops from rest ( speeds up/ slows down)

Answer 6

Speeds up!