Friction
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.
What is Fluid Friction?
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.
What is Law of Universal Attraction?
Equal forces acting on an object in opposite directions (no motion).
What is balanced forces?
The overall rate of speed at which an object travels or moves; calculated by dividing the total distance an object travels by the total time.
What is average speed?
The fluid friction experienced by objects falling through the air.
The force that one that one surface exerts on another surface when the surfaces come into contact with each other.
What is Friction?
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.
What is Newton's First Law (Inertia)?
A push or pull exerted on an object. It is described by its strength and direction in which it acts.
What is Force?
The speed of an object at on instant time.
What is instantaneous speed?
In physics, this is the motion of a body moving through the atmosphere with gravity as the only force acting on the body.
What is free fall?
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.
What is Rolling Friction?
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 upon an object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
What is Newton's Second Law?
The force that pulls all object towards each other. Example: The Earth's attraction to the sun.
What is gravity?
The distance an object travels per unit of time.
What is speed?
The basic SI unit for length.
What is meter (m)?
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
What is sliding friction?
For every action, there is an equal and opposite reaction.
Determines if an object moves and in which direction.
What is Net Force?
Speed in a given direction (speed with a direction).
What is velocity?
The amount of matter in an object.
What is mass?
Comes into play when a body is forced to move along a surface but movement does not start (no motion).
What is static friction?
Developed laws of motion, theory of gravity and believed that comets sustained life on Earth and other planets.
What is Sir Isaac Newton (1642-1727)?
Forces that produce a nonzero net force, which changes and object's motion (motion).
What is unbalanced force?
The greatest velocity a falling object can achieve.
What is terminal velocity?
The product of an objects mass and velocity.
What is momentum?