Vocabulary Words Physics, Chapter 2-7
Terms in this set (37)
Is a push or a pull. A force of some kind is always required to change the state of motion of an object.
Is the combination of all forced acting on an object. The net force on an object changes its motion.
Is a arrow that represents the magnitude and direction of a quantity. Ex. Velocity.
Is a quantity that needs both magnitude and direction for a complete description. Ex. Force.
Is a number that represents a magnitude. Example: Time.
Is a quantity that can be described by magnitude only and has no direction. Ex. Time, area and Volume.
Is a state where in no physical changes occur, it is a state of steadiness.
The upward force that balances the weight of an object on a surface.
The sum of two or more vectors.
Is the name given to the force that acts between materials that touch as they move past each other.
The property of a body to resist changes to its state of motion.
Newton's first Law
States that every object continues in a state of rest, orof uniform speed in a straight line, unless acted by a nonzero net force.
Mass is measured by this.
The quantity of matter in an object.
Is the force of gravity on an object.
The SI unit of force.
When we describe the motion of one object with another.
Is how fast an object is moving.
The speed at any instant.
Is the total distance covered divided by the time.
Is a speed in a given direction.
The Rate at which the velocity is changing.
An object moving under the influence of the gravitational force.
Is the time that has elapsed, or passed, since the beginning of any motion, in this case the fall.
Two vectors at right angle that add up to a given vector.
The process of determining the components of the vector.
Is an object that moves through the air or space, acted only by gravity (and air resistance, if any).
Means that two values change in opposite directions. Mathematically we see that as the denominator increases, the whole quantity decreases by the same factor.
Newton's second law
It states that the acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of an object.
Friction, or drag, that acts on something moving air.
A diagram showing all the forces acting on an object.
Force per unit of surface area where the force is perpendicular to the surface; measured in pascals.
Is the speed at which the acceleration of a falling object is zero because friction balances the weight.
Terminal speed together with the direction of motion (down for falling objects).
A mutual action.
Newton's Third Law
Describes the relationship between two forces in an interaction. Newton's third law states that whenever one object exerts a force on a second object, the second object exertsan equal and opposite force on the first object.
Action Force and Reaction Force
They are partners in a single interaction and that neither force exists without the other.