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Sci Explosion ch 9
Science Explosion v4, chapter 9
Question | Answer |
---|---|
acceleration | The change in velocity during a period of time. |
block and tackle | An arrangement of fixed and movable pulleys connected by ropes. |
compound machine | A machine that combines two or more simple machines. |
distance | The amount of space traveled from where an object starts to where it is at any given moment. |
effort force | The force applied to a simple machine. |
fixed pulley | A type of pulley that is attached to something so that the pulley does not move; it changes the direction of a force. |
friction | A force that keeps objects from moving. |
fulcrum | The fixed point on which a lever turns. |
gravity | The pull of one object on another. |
inclined plane | A simple machine consisting of a flat, slanted surface, such as a ramp. |
inertia | The resistance to a change in motion. |
joule | The unit used to measure work; equal to one newton meter of work. |
lever | A simple machine consisting of any bar that turns on a fulcrum. |
mechanical advantage | The ability to get something moving |
mechanical energy | The decrease in effort needed to move an object. |
momentum | The mass and velocity (speed and direction) of an object. |
motion | Change of an object's position |
moveable pulley | A type of pulley that moves along a rope where the effort is above the pulley. |
newton | The unit used to measure force (weight). |
pulley | Simple machine consisting of a wheel with a chain or rope wrapped in the groove of the wheel. |
reference point | A fixed, unmoving object needed to determine whether another object has changed position |
screw | A simple machine consisting of an inclined plane that is wound around a cylinder or cone. |
speed | The rate at which an object travels; determined by dividing the distance by the amount of time the object takes to travel that distance |
velocity | The distance an object moves over a given amount of time in a certain direction. |
wedge | A simple machine consisting of two inclined planes back-to-back. |
wheel and axle | A simple machine consisting of a wheel and a rod running through the axle. |
work | A force acting on something and moving it a distance. |
Resistance force | The force that works against the effort |
Machine | Any object that makes work easier |