Laws
An object at rest stays at rest and an object in motion stays in motion with the same velocity and in the same direction unless acted upon by an unbalanced force.
Newton's First Law
The product of the mass and velocity of an object.
Momentum
Substances that occupy space and have mass.
Matter
Occurs when two objects slide over each other. Example: sand on an icy sidewalk to improve footing, rubber brake pads rubbing on tire rim to slow a bike
Sliding Friction
The basic SI unit for length
Meters
Any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Law of Universal Attraction
Is when a moving object increases speed, decreases speed or changes direction.
Acceleration
The force of gravity on an object at the surface of a planet or other heavenly body.
Weight
A force that slows down the motion of a rolling object. Basically, it is a combination of various types of frictional forces at point of contact of wheel and ground or surface. When soft object moves over a hard surface then its distortion makes it slow down.
Rolling Friction
In physics, this is the motion of a body moving through the atmosphere with gravity as the only force acting on the body.
Free Fall
For every action, there is an equal and opposite reaction.
Newton's Third Law
The distance an object travels per unit of time.
Speed
The force that pulls all object towards each other. Example: The Earth's attraction to the sun.
Gravity
When a body moves in a fluid or in air then there exists a resistive force which slows down the motion of the body. A freely falling skydiver feels a drag force due to air which acts in the upward direction or in a direction opposite to skydiver's motion.
Fluid Friction
This is a vector quantity that describes how far an object moves from its original position.
Displacement
A particle attracts every other particle in the universe using a force. The greater the mass, the greater the attraction. The greater the distance, the weaker the attraction.
Newton's Law of Universal Gravitation
Speed in a given direction (the speed with a direction).
Velocity
The amount of matter in an object.
Mass
Comes into play when a body is forced to move along a surface but movement does not start (no motion).
Static Friction
Determines if an object moves and in which direction.
Net Force
Explains behavior of an object. Acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
Newton's Second Law
The speed of an object at one instant of time.
Instantaneous Speed
In physics, this is known as the quantity of measurement. Large or small.
Magnitude
The force that one surface exerts on another surface when the surfaces come into contact with each another.
Friction
In physics, this is known as the quantity of measurement. Large or small.
Magnitude