Basic Concepts of Force

Unbalanced Forces

• Forces that are equal (no motion occurs).

• Forces that are not equal (motion occurs).

• Forces that are always in opposite directions.

• Forces that cancel each other out.

Mass

• A measure of the amount of matter in an object, which affects its resistance to acceleration.

• The weight of an object in a vacuum.

• The volume of an object divided by its density.

• The force exerted by an object due to gravity.

Inertia

• The tendency of an object to resist a change in motion.

• The force that causes an object to accelerate.

• The speed of an object in a straight line.

• The mass of an object multiplied by its velocity.

Gravity

• The force that pulls all objects in the universe toward one another.

• A type of energy that can be harnessed for power.

• The phenomenon of objects moving in a circular path.

• A measure of the amount of matter in an object.

Balanced Forces

• The forces acting on an object that are equal in size and opposite in direction, canceling each other out (no movement).

• Forces that cause an object to accelerate in the same direction.

• Forces that are unequal in size and opposite in direction, resulting in movement.

• Forces that act on an object in the same direction, increasing its speed.

Force

• A type of energy that can be stored

• Any push or pull that causes an object to move, stop, or change direction.

• A measure of the mass of an object

• A unit of measurement for speed

Friction

• A force that opposes motion when two objects are in contact with each other.

• A force that accelerates objects in motion.

• A force that increases the speed of an object when it is sliding.

• A force that has no effect on the motion of objects.

Newton's First Law of Motion

• An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.

• An object will always move in a straight line unless acted upon by a force.

• An object in motion will eventually come to a stop without any external force.

• An object at rest will eventually move if left alone.