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Romanelli Chapter 13
Force in Motion
| Question | Answer |
|---|---|
| Constant Motion | Steady, constant motion Earth’s Rotation/Revolution |
| Variable Motion | The ability to move at various speeds. Car, ceiling fan, people |
| Periodic Motion | Starting and stopping motion Grandfather clock pendulum, a yo-yo, a clock’s second hand |
| Circular Motion | Movement along a circular pathway. Earth’s rotation/revolution, record player, a boomerang |
| Vibrational Motion | A rapid back and forth motion. Plucking a rubber band or guitar string |
| Know the difference between Speed and Velocity. | Speed – How far an object moves over a certain Amount of time. Speed also depends on a point of reference. Velocity – describes BOTH the speed at which an object is moving as well as the direction in which it is moving. |
| Know how to calculate speed. | Speed =Distance ÷Time |
| Be able to explain the difference between work and power. | Work – Done only when a force moves and object. Work = Force X Distance measured in Joules. One Joule(j) is done when a force of one Neuton(n) moves an object a distance of one Meter(m). Power – The rate at which work is done. Power = Work/Time. |
| Know the different types of simple machines and what a complex machine is. Be able to give an example of each type of simple machine. | A machine is a device that changes the direction or amount of force needed to do work. A simple machine is a machine with only a few parts. |
| Levers | screwdriver, pry bar, see-saw |
| Pulleys | flagpole, blinds |
| Inclined Planes | screw, ramp, wedge, knife |
| Wheel and Axles | bike, car, steering wheel, doorknob |
| Complex/Compound Machines | those devices that combine two or more simple machines. Cars, Bicycles, Scissors, boats |
| Inertia | The tendency of an object to resist a change in motion (to stay still or continue movement). Objects with more mass have more inertia than objects with less mass. |
| Gravity | A natural force that attracts one object to another. All objects that have mass exert gravity. The more mass the object has, the more gravitational pull it exerts. |
| Friction | The force that results when two materials rub against one other. Friction acts to slow down the motion of an object or keep it from starting to move. |
| Magnetism | A force that pushes or pulls on other objects. |
| Newton’s 1st Law of Motion | An object at rest will stay at rest unless acted upon by an outside force; An object in motion will stay in motion unless acted upon by an outside force. |
| Newton’s 2nd Law of Motion | Force = Mass X Acceleration The net forces acting on an object can change an object’s motion by making it speed up, slow down, or change direction. Force can be increased or decreased by changing either the mass of the object or the speed it travels. |
| Newton’s 3rd law of Motion | Every action has an equal and opposite reaction. Actions always act in pairs. |
Created by:
jromanelli
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