Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
PT 7th Science2
Chpt 4 - 5 Vocabulary
| Question | Answer |
|---|---|
| The rate at which velocity changes; The object's change in velocity/the amount of time in which the change occurs | acceleration |
| Fluid friction that opposes the motion of objects through air; occurs between the surface of any falling object and the air that surrounds it. | air resistance |
| Constant velocity; the net force is zero and the object stops accelerating | terminal velocity |
| if gravity is pulling an object down and no other forces are acting on it; can only occur where there is no air, such as in a vacuum, or in space | free fall |
| the unbalanced force that causes objects to move in a circular path; toward the center | centripetal force |
| the curved path an object follows when it is thrown or propelled near the surface of the Earth. Examples: a frog leaping, a swimmer diving into water, water sprayed by a sprinkler | projectile motion |
| motion parallel to the ground | horizontal motion |
| motion perpendicular to the ground | vertical motion |
| An object at rest remains at rest and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force | Newton's First Law |
| the tendency of all objects to resist any change in motion | inertia |
| a measure of inertia | mass |
| The acceleration of an object depends on the mass of the object and the amount of force applied. | Newton's Second Law |
| Whenever an object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.All forces act in pairs | Newton's Third Law |
| a property of a moving object | momentum |
| Any time two or more objects interact, they may exchange momentum, but the total amount of momentum stays the same | the law of conservation of momentum |
| occurs when a force causes an object to move in the direction of the force. | work W = F x d |
| The unit used to express work, the Newton-meter | joule |
| The rate at which work is done | power P = W/t |
| The unit used to express power; joules per second (J/s) | Watt |
| a device that helps make work easier | machine |
| the work you do on a machine | work input |
| the work done by the machine | work output |
| tells you how many times the machine multiplies force; compares the input force with the output force | mechanical advantage |
| a comparison of a machine's work output witht he work input | mechanical efficiency |
| a simple machine consisting of a bar that pivots at a fixed point, called a fulcrum | lever |
| the fulcrum is between the input force and the load; always change the direction of the input force | First class levers |
| Do not change the direction of the input force, but allow you to apply less force than the force exerted by the load | Second class levers |
| they increase the distance through which the output force is exerted. | Third class levers |
| a simple machine that is a straight, slanted surface | inclined plane |
| a double inclined plane that moves | wedge |
| an inclined plane that is wrapped around a cylinder | screw |
| a simple machine consisting of a grooved wheel that holds a rope or a cable | pulley |
| a pully that has been attached to a stationary, or fixed, object | fixed pulley |
| attached to the object being moved, increase force | movable pully |
| when a fixed pulley and movable pulley are used together | block and tackle |
| a simple machine consisting of two circular objects of different sizes | wheel and axle |
| machines that are made of two or more simple machines | compound machines |
Created by:
shontee01
Popular Physical Science sets