Physics Unit 6 Test

Force

A push or a pull that one object exerts on another

Balanced Forces

Equal forces in opposite directions that result in a zero net force

Net Force

The result of all forces acting on an object (the sum of all forces)

Unbalanced Forces

A force on an object that is not balanced by another force, results in the motion of the object

Inertia

The tendency of an object to resist a change in motion

Mass

The amount of matter in an object

Weight

The force due to gravity pulling down on that mass

Gravity

The attractive force exerted by any two masses

Air resistance

A force that acts in the opposite direction of the object’s motion

Terminal Velocity

The highest velocity an item in free fall will reach; when forces of gravity and air resistance are balanced, therefore the object is not accelerating (has a net force of zero)

Newton’s first law of motion

An object in motion will stay in motion until acted upon by an unbalanced force (law of inertia)

Newton’s second law of motion

An object will accelerate in the direction of the net (unbalanced) force

Newton’s third law of Motion

For every action, there is an equal and opposite reaction

Momentum

A property of an object that is related to how much force is necessary to change it’s motion

Law of conservation of Momentum

Momentum can be transferred from one object to another, the momentum of the object will not change unless the mass, velocity, or both change

Elastic Collision

Collisions where the objects bounce off of each other and separate

Inelastic Collisions

Collisions where the objects stick together and move as one. The mass after the collision is equal to the sum of the masses and there is just one final velocit.