Science 9 Lesson 1: Inertia and Forces

Vocabulary flashcards covering the concepts of inertia, Newton's First Law, balanced and unbalanced forces, mass, and friction as presented in the Science 9 Lesson 1 lecture notes.

Inertia

The natural tendency of an object to resist changes in its motion, whether it is at rest or moving in a straight line with constant speed.

Balanced forces

Forces that are equal in size and opposite in direction, resulting in no change in the motion of an object.

Unbalanced forces

Forces that are not equal, causing an object to move, stop, speed up, slow down, or change direction.

Newton's First Law of Motion

The law stating that an object at rest will remain at rest or in motion at a constant velocity unless acted upon by a net force.

Constant velocity

Moving in a straight line at a constant speed.

Friction

A force that opposes an object's direction of motion and causes moving objects to slow down.

Mass

The measurement of an object's inertia, typically expressed in kilograms ($kg$).

Force

A push or pull that can change the motion of an object.

Kilograms ($kg$)

The unit of measurement used to express mass.

Law of Inertia

Another name for Isaac Newton's First Law of Motion, which integrates the concept that objects resist changes to their state of motion.