Unit 2

Question 1

Dynamics

Answer 1

The study of how forces affect the motion of objects and systems

Question 2

Force

Answer 2

A push or pull on an object with a specific magnitude and direction; can be represented by vectors; can be expressed as a multiple of a standard force

Question 3

Free-Body Diagram

Answer 3

A sketch showing all of the external forces acting on an object or system; the system is represented by a dot, and the forces are represented by vectors extending outward from the dot

Question 4

External Forces

Answer 4

A force acting on an object or system that originates outside of the object or system

Question 5

Newton’s First Law of Motion

Answer 5

A body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted on by a net external force (law of inertia)

Question 6

Inertia

Answer 6

The tendency of an object to remain at rest or remain in motion

Question 7

Mass

Answer 7

The quantity of matter in a substance; measured in kilograms