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science
energy test
| Question | Answer |
|---|---|
| Using what you know about electric fields and how forces interact, how could you make the two balloons repel? | By rubbing both balloons on the sweater, it will remove electrons from the sweater onto the balloons, causing both to become -. If both are -, they have like charges, and will repel. |
| Explain the relationship between electricity and magnetism. | Electricity can create magnetism by creating an electromagnet. In this, electric current creates a magnetic field, causing objects to be attracted. Magnetism can create electricity by using a generator. In this, a magnet moves around a wire, causing cur |
| Identify two general factors that influence the strength of a magnetic, electrical, or gravitational field. | Distance Strength/power Gravity = mass Electricity = charge Magnetism = magnetic strength |
| Give 4 examples of objects with elastic potential energy. | A bouncing ball A rubber band pulled back A compressed or stretched spring A bow pulled back A baseball being hit |
| Give 3 examples of evidence that would indicate chemical energy being released. | change in color Bubbles Change in temperature |
| When brushing your hair, your hair will sometimes be attracted to the brush. | When you brush your hair, you are removing electrons from one surface and putting them onto another. Doing so creates one to be + and one to be - = opposites attract |
| Explain why this occurs; Give two examples that would cause the attraction to INCREASE between your hair and the brush. | You could increase the strength by: Brush more Get a bigger brush Brush harder Bring the brush closer |
| When moving further away from a charged particle, magnet, or star, how does the strength of the field change? | It decreases |
| Where is the strongest part of a magnet? The weakest? | Strongest = poles Weakest = middle |
| Which energy conversions are taking place when a fossil fuel is burned to run a fan plugged into an electrical outlet? | Chemical potential to thermal to electrical to mechanical (motion) |
| Label the numbers above with the appropriate particle names. | 1 = neutron 2 = electron 3 = proton 4 = who cares? |
| If you break a magnet into two pieces, will it still work? Explain. | Yes! (think of the Bill Nye demo with the toy cars) Because the magnet is already polarized (+ are facing one direction, - facing the opposite direction), it will be two smaller magnets |
| What two factors determine an object’s gravitational potential energy? | Mass distance/position |
| How can you increase the strength of an electric field? | Increase the charge Bring the objects closer |
| Explain how to create a temporary magnet with a non-magnetic metal (such as a paperclip). | When putting the non-magnetic object into a magnetic field, the domains (crystals) will temporarily align and create polarization. This allows them to attract metals. |
| Using wire, a light bulb, and magnet. Give two simple ways to generate electric current. | Create a circuit with the wire and lightbulb. Move the magnet around the wire. |
| Why is the Moon have a greater effect on the Earth’s tides than the Sun? | The moon is closer (gravity is greatly affected by distance) |
| ON EARTH - what are two ways to increase an object’s gravitational potential? | Bigger mass Bigger distance from surface |
| IN SPACE - what are two ways to increase an object’s gravitational potential? | Bigger mass Closer distance |
| What particle is responsible for electricity? | electrons |
| Give two examples that illustrate this connection and explain how each works. | creates a magnetic field, causing objects to be attracted. Magnetism can create electricity by using a generator. In this, a magnet moves around a wire, causing current to be created. |
| The air around you is full of waves ? True or False | True |
| visible light is a wave? True or False | true |
| what is a Medium? | A medium is the material solid, liquid or a gas through which a wave can travel |
| what is a transverse wave? | partials move perpendicularly to the direction the waves travel |
| what is a crest? | The point where the wave is the highest |
| what is a troughs? | The point where the wave is the lowest |
| what is a wave? | is a disturbance of energy |
| what is a longitudinal wave? | particles move back and forth in the same direction |
| what is a compression? | when coils are pull or put together |
| what is a rarefaction? | when you push forward, you compress the coils closer together |
| If a drop of water lands in a body of water, it forms a surface wave, which is a combination of ____ and ____ waves. | transverse (perpindicular to the direction of the wave traveling) and longitudinal (back and forth) waves |
| If a noisy toy is placed inside an airtight class container, would you be able to hear the sound? | No, because there is no air to transmit the sound. |
Created by:
MOLLYgeorge123
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