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12 Cards in this Set
- Front
- Back
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What is the difference between speed and velocity? |
Velocity includes distance and direction, where speed just includes distance per unit time. |
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Explain the difference between positive and negative acceleration? |
If speed increases, acceleration is positive . If speed decreases, acceleration is negative. |
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During which 10-minute interval was the horse running, walking, and resting? Explain your answer. |
During the interval from 0-10 minutes, the horse was walking. The speed was 0.15 km/min. Between 10 and 20 minutes, the horse was resting because the speed was 0 km/min. Between 20 and 30 min., the horse was running because the speed was 0.25 km/min. Finally between 30 and 40 minutes, the horse was resting again because the speed was 0 km/min. |
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Briefly explain Newton's First Law of Motion. |
An object a rest will stay at rest or an object in motion will stay in motion unless acted upon by an unbalanced force. |
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Explain the difference between a wet-cell and a dry cell battery. |
Wet cell contains plates in conduction solution, while dry cells use moist paste for conduction. |
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How can one increase electrical resistance? |
In order to increase electrical resistance, one can use thinner wires, longer wires, or hotter wires. |
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What is the function of circuit breakers and fuses? |
The function of a circuit breaker is when it gets hot, it opens circuit and stops current flow. The function of a fuse is that it will melt if current becomes too high opening the circuit to stop current flow. This stops electrical fires from occurring because of overheated wires. |
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Explain why homes use parallel circuits instead of series circuits. |
Homes use parallel circuits because if one switch turns off, the rest of the home stays on. |
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Describe two ways you could change the strength of a magnetic field created by an electromagnet would be more turns in wire coil and increasing the current. |
One would increase the strength of a magnetic field created by an electromagnet would be to more turns on the wire coil and increase the current. |
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Explain what happens when you disconnect the electricity source from an electromagnet. |
When you disconnect the electricity source from an electromagnet, it will lose the magnetic field. |
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What energy change occurs in an electric motor? |
The energy change that occurs in an electric motor is electrical energy changes to mechanical energy. |
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What is an alternating current and where can an example be found? |
An alternating current is a current that reverses direction in a regular pattern. It can be found in a wall outlet. |
