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Science Final Study
| Question | Answer |
|---|---|
| Know what a chemical reaction is and be able to give examples. | the proccess by which one or more substances undergo change to produce one or more different substances.example- baking powder mixed with water. |
| Know what a chemical formula is and be able to count the number of atoms in a chemical formula. | a shorthand notation for a compound or a diatomic element using chemical symbols and numbers. |
| Know what a chemical equation is and know the parts of a chemical equation. | a shorthand description of a chemical reaction using chemical formulas and symbols.example-reactants, products |
| Know the law of conservation of mass. | mass is neither created nor destroyed |
| Know what friction is. | a force that opposes motion between two surfaces that are touching. |
| Know what a force is and how it is expressed. | a push or a pull;all forces that have both size and/or direction.-Force is expressed in Newtons |
| What is Velocity- | the speed of an object in a particular direction |
| What is acceleration- | the rate at which velocity chhanges; an object accelerates if its speed changes,or if both speed and direction change. |
| Know the different types of friction. | sliding friction, rolling friction, fluid friction and static friction. |
| Be able to calculate acceleration. | Acceleraction= final velocity minus starting velocity divided by the time it takes to change velocity. |
| Know the law of universal gravitation and what affects the force of gravity. | All objects in the universe attract each other through gravitational force. |
| Be able to calculate the net force of an object. | -if the forces are the same direction you add them together.-if the forces are going in the oppisite direction you subtract them. |
| Know what a referance point is and be able to give examples. | when an object appears to stay in place.-a mountain. |
| Know what speed is and be able to calculate it. | the rate at which an object moves.-Distance divided by time. |
| Be able to explain and calculate velocity. | same as speed but velocity includes direction. |
| Be able to compare balanced and unbalanced forces. | -balanced forces have the sam amount of force on each side.-unbalanced forces have different amount of force on each side so that way an object can move. |
| Be able to calculate the velocity of falling objects, | velocity= gravity*time |
| Know how air resistance affects different shaped objects | it pushes up on the object. |
| Be able to explain and give examples of projectile motion. | the curved path an object follows.-example- a football being passed. |
| Be able to explain Newtons 3 laws. | 1st- An object at rest remains at rest and an objest in motion remains in motion unless acted on by an unbalanced force. 2nd- The acceleraton of an object depends on the mass of the object and the amount of force applied. 3rd- Whenever one object exerts a |
| Be able to explain inertia | the tendancy of all objects to resist any change in motion, |
| Be able to calculate accelration using Newtons 2nd law. | Acceleration=force divided by mass or Force= mass times acceleration. |
| Be able to compare the momentum of different objects. | it depends on the objects mass and velocity. |
| Be able to calculate work | Work=force times distance |
| Know what the simple machines are. | pulley, wheel and axle, lever, wedge, screw, inclined plane. |
| Be able to calculate power, | Power= work divided by time |
| Know the force disrance tradeoff of machines. | When a machine changes the size of the force, the distance through which the force is exerted must also change. |
| Be able to calculate mechanical effeciency. | Work input divided by work output times 100 |
| What is the unit used for work and energy. | joules |
| What is the difference between potential and kinetic energy. | Kinetic energy is the energy of motion. potential energy is the energy and object has because of its position. |
| Be able to calculate kinetic energy. | mass times velocity squared divided by two |
| What does GPE depend on | weight and height |
| Be able to calculate GPE | weight times height. |
| Be able to define mechanical energy | the total energy of motion and position of an object. |
| Be able to explain the law of conservation of energy | energy cannot be created nor destroyed |
| Be able to explain the purpose of a conductor. | a material in which charges can move easily |
| Be able to explain the purpose of a insulator. | a material in which charges cannot easily move. |
| What is current? | the rate at which charge passes a given point. |
| Be able to explain direct current and alternating current and how they differ. | direct- the charges always flow in the same direction.Alternating- charges continually switch directions. |
| Voltage | the difference in energy |
| Know what voltage is commonly used in the U.S. | T.V., toasterm Alarmclock |
| Resistance | the opposition to the flow of electrons |
| Be able to describe series circuts | which all parts are connected to one singe loop |
| Be able to describe parrallel circuts | different loads are located on seperate branches |
| Be able to describe the law of electric charge | like charges repel. unlike charge attract |
| Be able to explain 3 ways that an object to become charged | friction, conduction and induction |
| Know what an electric circut is | closed path in which electric charges flow. |
Created by:
Sugarkube1
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