Motion And Forces Flashcards
A location to which another location is compared.
Reference point
An object’s location.
Position
A change of position over time.
Motion
A measure of how fast something moves through a particular distance over a definite time period. Speed is distance divided by time.
Speed
A speed in a specific direction.
Velocity
A quantity that has both size and direction.
Vector
The rate at which velocity changes over time.
Acceleration
A push; something that changes the motion of an object.
Force
The overall force acting on an object when all of the forces acting on it are combined.
Net force
A scientific law stating that objects at rest remain at rest and objects in motion remain in motion with the same velocity unless acted on by an unbalanced force.
Newton’s first law
The resistance of an object to a change in the speed or the direction of its motion.
Inertia
A scientific law stating that the acceleration of an object increases with increased force and decreases with increased mass.
Newton’s second law
Any force that keeps an object moving in a circle.
Centripetal force
A scientific law stating that every time one object exerts a force on another object the second object exerts a force that is equal in size and opposite in direction back on the first object.
Newton’s third law
The use of force to move an object over a distance.
Work
A unit used to measure energy and work. One calorie is equal to 4.18 joules of Energy; one joule of work is done when a force of one Newton moves an object one meter.
Joule
Stored energy; the energy an object has to its position molecular arrangement or chemical composition.
Potential energy
The energy of motion. A moving object has the most kinetic energy at the point where it moves the fastest.
Kinetic energy
A combination of the kinetic energy and potential energy an object has.
Mechanical energy
As long as you account for all the different forms of energy involved in any process you will find that the total amount of energy never changes.
Conservation of energy
The rate at which work is done.
Power
The unit of measure for power,which is equal to one joule of work done or energy transferred in one second. For example ,a 75 w light bulb converts electrical energy into heat and light at a rate of 75 joules per second.
Watt
The unit of measurement of power for engines and motors. One horsepower equals 745 watts.
Horsepower
