Ch.3 Sec.3

Question 1

Air Resistance and what it depends on

Answer 1

A friction-like force that opposes the motion of objects that will move through the air. It depends on the size, shape, and speed of the object, as well as the properties of the air.

A force like friction that rejects the motion of objects that will move through air. They depend of size, shape, and speed.

Ex. No resistance in a vacuum

Question 2

Terminal Velocity

Answer 2

The maximum speed of an object will reach falling through a substance.

The highest speed of an object that will reach to falling through a substance.

Ex. Open parachute has a larger resistance

Question 3

Free Fall

Answer 3

Describes the fall of an object on which only the force of gravity is acting.

Describes the fall of an object when only gravity is acting upon it.

Ex. Sky diving

Question 4

Centripetal Force

Answer 4

A course that is directed toward the center of a curved or circular path.

A course that has been directed to the center of a circular or curved path.

Ex. A circular roller coaster ride

Question 5

Momentum

Answer 5

Property of a moving object that equals its mass times its velocity.

Mass times velocity of a moving object.

                     2 Ex. P = kg•m/s

Question 6

Law of Conservation of Motion

Answer 6

States that if no external forces act on a group of objects, their total momentum does not change.

Says no external force can act on a group of objects and that their total momentum doesn’t change.

Ex. Pool table

Question 7

How objects fall in a vacuum

Answer 7

In a vacuum there’s no air resistance. As a result, the feather and the Billard ball fall with the same acceleration in a vacuum

Question 8

Objects in freefall

Answer 8

Objects in a vacuum

Earth (things in orbit)