In measurement, an exact quantity that everyone agrees upon.
Modern version of metric system. Based on powers of 10.
The SI base unit of length
The amount of space occupied by an object.
Unit of measurement obtained by combining SI units (density= mass/volume)
Base unit of volume for LIQUID
The amount of matter in an object
The SI unit for mass
Describes how tighly packed a substance's molecules are.
The interval between two events
The SI unit for time
The SI unit for temperature
a visual display of information or data
How fast something is going
The rate of motion at a given instant in time (car speedometer)
speed that does not change
A rate of motion determined by= d/t
the speed and direction of a moving object
The rate of change in velocity
A push or pull one object exerts on another.
forces that are equal in size and opposite in direction
The sum of the forces on an object when unbalanced forces are applied to it.
The tendency of an object to resist any change in its motion
The force that opposes motion between two surfaces that are touching each other
Newton's Second Law of Motion
An object's acceleration depends on its mass and the Fnet upon it.
frictional force air exerts on a moving object. depends on shape, density, speed, and size
the greatest velocity reached by a falling object. Occurs when force of gravity is balanced by air resistance
Any object shot of thrown through the air
Acceleration toward the center of a circle by an object moving along a circular path
The force that causes an object moving along a circular path to move toward the center of the path
property of any moving object. product of mass and velocity
law of conservation of momentum
states that the total momentum of a group of objects is conserved unless a net force acts on the objects.
The ability to cause change.
Energy in motion. The greater the mass and velocity, the greater the KE
The transfer of energy through motion. Measured in JOULES
The total amount of KE and PE in a system
law of conservation of energy
a law stating that energy can form but can't be created nor destroyed under ordinary conditions
a measure of the average KE of the particles that make up matter. More KE of particles=higher temp. Less KE= lower temp.
Total energy of a material's products, including PE and KE
Thermal energy that flows from warmer material to a cooler material.
The amount of enegy needed to raise 1 kg of material 1 degree.
a device that makes work easier
a device that accomplishes work with only one movement.
the force applied to a machine when a machine is used to do work.
the force exerted by a machine to overcome resistance to gravity or friction.
A machine in which work input equals work output.
The number of times a machine multiplies the effort force applied to it.
a simple machine consisting of a bar that is free to rotate around a fixed point.
The fixed point around which a lever pivots.
The part of a lever on which an effort force is applied.
The part of a lever that exerts the resistance force.
a simple machine consisting of a grooved wheel with a rope or a chain running along the groove.
wheel and axle
A simple machine consisting of two different sized wheels that rotate together, such as a doorknob or wheel-handled faucet.
A simple machine consisting of a ramp used to raise objects.
A simple machine consisting of a special type of inclined plane wrapped in a spiral around a cylindrical post
a simple machine consisting of a moving inclined plane with one or two sloping sides. examples are knives and chisels.
Static friction is the force between two objects that are not moving relative to each other.
Kinetic (or dynamic) friction occurs when two objects are moving relative to each other and rub together
objects collide and bounce off each other
objects collide and stick together