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# Cubangbang #121928

### Cubangbang 6th Ch. 9 Motion & Machines Stack #121928

Chapter 9 DefinitionChapter 9 Vocab
The change of an object's position Motion
The force that keeps objects from moving against other objects Friction
Determined by the mass and velocity of an object Momentum
The speed and direction of a moving object Velocity
Occurs whenever an object speeds up, slows down, or changes direction Acceleration
Force is equal to the mass of an object an its acceleration Second Law of Motion
When one object exerts a force on another object, the second object reacts by exerting an equal force back on the first object. Third Law of Motion
An object tends to stay at the same velocity unless another force causes it to change. First Law of Motion
The ability to do work Energy
The ability to make something move Mechanical energy
A fixed unmoving object or location Reference point
The change in an object's position Motion
The amount of matter in an object Mass
Determined by an object's mass and velocity Momentum
A push or pull that causes an object to change speed or direction Force
Keeps an object from moving against other objects Friction
Occurs whenever an object speeds up, slows down or changes direction Acceleration
The resistance to a change in motion Inertia
Spot where a lever turns Fulcrum
Resistance force works against Effort
An example of a wheel and axle Doorknob
Which unit is used to measure work? Joule
The decrease in effort that is needed to move an object Mechanical Advantage
Which machine is a bar that turns on a point Lever
Which machine is actually an inclined plan wound around a cylinder or cone Screw
Which machine consists of two inclined planes placed back to back Wedge
Which simple machine makes work easier by either changing the direction of the force or by reducing the amount of force needed to move an object Pulley
Who formulated the three laws of motion Sir Isaac Newton
Gravity affects motion by keeping an object frommoving indefinitely in a straight line
Friction affects motion by keeping objects from moving against other objects.
Rocket launching, expelling gas downward to ground, causing rocket to move upward 3rd Law of Motion
Skating and hit a rock causing you to fall when you hit the rock 1st Law of Motion
Takes one student to carry a box of candy but takes two students to carry the same box with rocks. 2nd Law of Motion
Created by: jcubangbang