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Gravity
Vocabulary Words Physics, Chapter 2-7
Terms in this set (37)
Force
Is a push or a pull. A force of some kind is always required to change the state of motion of an object.
Net Force
Is the combination of all forced acting on an object. The net force on an object changes its motion.
Vector
Is a arrow that represents the magnitude and direction of a quantity. Ex. Velocity.
Vector Quantity
Is a quantity that needs both magnitude and direction for a complete description. Ex. Force.
Scalar
Is a number that represents a magnitude. Example: Time.
Scalar Quantity
Is a quantity that can be described by magnitude only and has no direction. Ex. Time, area and Volume.
Mechanical Equilibrium
Is a state where in no physical changes occur, it is a state of steadiness.
Support Force
The upward force that balances the weight of an object on a surface.
Resultant
The sum of two or more vectors.
Friction
Is the name given to the force that acts between materials that touch as they move past each other.
Inertia
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.
Kilograms
Mass is measured by this.
Mass
The quantity of matter in an object.
Weight
Is the force of gravity on an object.
Newton
The SI unit of force.
Relative
When we describe the motion of one object with another.
Speed
Is how fast an object is moving.
Instantaneous Speed
The speed at any instant.
Average Speed
Is the total distance covered divided by the time.
Velocity
Is a speed in a given direction.
Acceleration
The Rate at which the velocity is changing.
Free Fall
An object moving under the influence of the gravitational force.
Elapsed Time
Is the time that has elapsed, or passed, since the beginning of any motion, in this case the fall.
Components
Two vectors at right angle that add up to a given vector.
Resolution
The process of determining the components of the vector.
Projectile
Is an object that moves through the air or space, acted only by gravity (and air resistance, if any).
Inversely
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.
Air Resistance
Friction, or drag, that acts on something moving air.
Free-body diagram
A diagram showing all the forces acting on an object.
Pressure
Force per unit of surface area where the force is perpendicular to the surface; measured in pascals.
Terminal Speed
Is the speed at which the acceleration of a falling object is zero because friction balances the weight.
Terminal Velocity
Terminal speed together with the direction of motion (down for falling objects).
Interaction
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.
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