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6th Grade: Motion Forces Energy
Ms. Black @ Salk Motion, Forces and Energ
63
Science
6th Grade
06/12/2011

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Term
International System of Units
Definition
The system of measurement scientist use all over the world to communicate information clearly.
Term
Meter
Definition
The Basic SI unit of length
Term
Kilo
Definition
The prefix that means "one thousand." It is a big measure.
Term
Average Speed
Definition
Total distance divided by total time
Term
Speed
Definition
Distance an object travels per unit of time
Term
Constant Speed
Definition
When an object keeps a steady pace and speed does not change
Term
Velocity
Definition
Tells both the speed and direction an object is traveling
Term
An object is in motion if it changes position relative to what?
Definition
A reference point
Term
When an object's distance from another object is changing it is...
Definition
...in motion.
Term
Acceleration
Definition
The rate in which velocity changes. It can speed up, slow down or change direction.
Term
Increasing speed
Definition
happens when an object accelerates by speeding up
Term
Decreasing speed
Definition
when an object accelerates by slowing down
Term
The amount of something that occurs or changes in one unit if time is referred to as...
Definition
...rate
Term
Distance
Definition
how far it is from a starting point to a stopping point
Term
acceleration formula
Definition
final velocity - initial velocity/time
Term
Mass
Definition
the amount of matter an object has
Term
Inertia
Definition
the tendency of an object to resist a change in motion
Term
Newton's first law of motion
Definition
states an object at rest will remain at rest, and an object in motion will remain in motion until acted upon by an outside force
Term
Newton's second law of motion
Definition
Force = Mass times acceleration
Term
Newton's third law of motion
Definition
States that for every action force their is an equal and opposite reaction force.
Term
Balance Force
Definition
An equal force acting on an object in an opposite direction.
Term
Net Force
Definition
The overall force of an object after all the forces are added together
Term
Unbalanced force
Definition
Two unequal forces acting in opposite directions to cause motion
Term
Force
Definition
A push or pull
Term
Friction
Definition
The force that one surface exerts on another surface hen the two surfaces rub against each other
Term
Freefall
Definition
When the only force acting on a falling object is gravity
Term
sliding friction
Definition
when solid surfaces slide over each other, the kind of friction that occurs
Term
Air resistance
Definition
the fluid friction experienced on objects falling through the air
Term
Rolling friction
Definition
the kind of friction that occurs when an object rolls over a surface
Term
Projectile Motion
Definition
the kind of motion that happens when an object is thrown
Term
Fluid Friction
Definition
The friction that occurs when an object moves through a liquid or a gas
Term
Gravitation
Definition
The force of gravity on a person or object at the surface of a planet. It is the stuff that makes us touch the ground and walk or stand. The moon has none so folks float up there :)
Term
Gravity
Definition
The force that pulls objects towards each other. Like us and the ground.
Term
The Law of Universal Gravitation
Definition
states that the force of gravity acts between all objects in the universe
Term
Momentum
Definition
The product of mass and velocity. Momentum = Mass x Velocity
Term
The Law of Conversation of Momentum
Definition
States that the total momentum of any group of objects remains the same unless outside forces act on the objects
Term
Buoyancy
Definition
The upward force exerted by a fluid on a submerged object
Term
Density
Definition
Mass per unit of volume. Density = Mass/Volume (per means divided by)
Term
Action Force
Definition
The force exerted by the first object on a second object
Term
Milli
Definition
The prefix that means "one thousandth." It is a tiny measure.
Term
True or False: For WORK to be done an object must move some height as a result of force
Definition
False. It must move some DISTANCE as a result of force
Term
The unit of measure of Force
Definition
Newtons
Term
The unit of measure for WORK
Definition
Joules
Term
The formula for work
Definition
Force x Distance
Term
True or False
Definition
Simple Machines decrease the amount of work that is done
Term
A lever pivots around a fixed point called a...
Definition
...fulcrum
Term
Mechanical Advantage
Definition
the number of times a machine increases the effort force to make it easier to do work
Term
The three parts of a lever are:
Definition
effort, load and fulcrum
Term
The three parts of a lever are:
Definition
effort, load and fulcrum
Term
True or False: Machines make work easier by changing a force's speed, size and direction
Definition
True
Term
True or False: A fixed pulley changes the direction of the force needed to lift a load
Definition
True
Term
A movable pulley changes
Definition
the amount of force needed to life a load
Term
A block and tackle changes
Definition
both the amount and the direction of a force needed to lift a load
Term
True or False: A screw is an incline plane wrapped around a cylinder
Definition
True
Term
Gear
Definition
a device with toothed wheels that fits into another wheel
Term
Load
Definition
the weight of an object that is moved by a machine, or the resistance to movement that a machine must overcome.
Term
Effort force
Definition
a force applied to a machine to lift a load or overcome the resistance
Term
Wedge
Definition
a simple machine made up of two inclined planes placed back to back, like a chisel or a knife.
Term
Compound machine
Definition
a machine that utilizes two or more simple machines
Term
MA of an incline plane
Definition
Length/height
Term
True or false: Class 3 levers help increase effort force.
Definition
False: Class 3 levers help increase speed and distance
Term
True or False: MA of a pulley system is equal to the number of ropes that actually support the load.
Definition
True
Term
Class one and two levers increase this
Definition
resistance force
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