Physics - Chap 4: Forces in One Dimension

Force

A push or pull that causes a change in motion.

Free-body Diagram

A model representing the forces acting on a system.

Net Force

The vector sum of all forces on an object.

Newton's Second Law

Acceleration is proportional to net force and inversely proportional to mass.

Newton's First Law

An object at rest/motion continues unless acted upon by a net force.

Inertia

The tendency of an object to resist change.

Equilibrium

The condition where net force on an object is zero.

Apparent Weight

The force experienced by an object, resulting in acceleration.

Weightlessness

An object's apparent weight of zero due to no contact forces pushing up.

Drag Force

The force exerted by a fluid on a moving object.

Terminal Velocity

The constant velocity reached when drag force equals gravity.

Interaction Pair

Equal and opposite forces acting on different objects.

Newton's Third Law

All forces come in pairs, equal in strength and opposite in direction.

Tension

Force exerted by a rope or string.

Normal Force

the perpendicular contact force exerted by a surface on another object..

Newton's Second Law (Formula)

a = Fnet/m or Fnet = ma

Newton's Third Law (Formula)

Fa on b = -Fb on a