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Physics > Definitions > Flashcards

Definitions Flashcards

0
Q

What is Y-gain control?

A

An oscilloscope control used to adjust the height of the wave form.

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1
Q

What is a zero error?

A

A systematic error, often due to the measuring instrument having an incorrect zero. Eg- forgetting the end of the ruler isn’t at zero.

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2
Q

What is work?

A

Energy transferred by a force. Usually measured in joules.

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3
Q

What is a white dwarf?

A

A star that has collapsed from the red giant stage to become much hotter and denser than it was.

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4
Q

What is weight?

A

The force of gravity on an object in Newtons.

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5
Q

What is wasted energy?

A

Energy that is not usefully transformed of transferred.

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6
Q

What is a volt?

A

The unit of potential difference, equal to energy transfer per unit of charge in joules per coulomb.

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7
Q

What is a virtual image?

A

An image seen in a mirror or lens from which rays appear to come after being reflected by the mirror or refracted by the lens.

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8
Q

What is velocity?

A

Speed in a given direction measured in meters/second

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9
Q

What is van de graaf generator?

A

A large insulated metal dome charged by the motion of a rubber belt brushing against a friction pad.

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10
Q

What is valid data?

A

Evidence that can be reproduced by others an answers the original question.

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11
Q

What does valid mean?

A

Describes an investigation that successfully gathers the data needed to answer the original question.

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12
Q

What is useful energy?

A

Energy transferred to where it is wanted in the form it is wanted.

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13
Q

What are ultrasonic waves?

A

Sound waves above the frequency of the human ear. About 18,000 hz.

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14
Q

What is a transformer?

A

An electrical device that changes an alternating voltage.

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15
Q

What is a step up transformer?

A

It is used to step up the voltage from a power station to the national grid.

16
Q

What is a step down transformer?

A

This is used to step the voltage down from the grid to the mains voltage in homes and offices.

17
Q

What is time base control?

A

An oscilloscope control used to space the waveform out horizontally.

18
Q

What is a three pin plug?

A

A three pin plug has a live pin, neutral pin and an earth pin. The earth pin is used to earth the metal case of the appliance so it cannot become live.

19
Q

What is thinking distance?

A

The distance travelled by the vehicle in the time it takes the driver to react.

20
Q

What is thermal radiation?

A

Energy transfer by electromagnetic waves emitted by objects due to their temperature.

21
Q

What is theory?

A

A theory is not a guess or a fact. It is the best way to explain why something is happening. They can be changed when better evidence is available.

22
Q

What is terminal velocity?

A

The velocity reached by an object when the drag force on it is equal and opposite to the force making it move.

23
Q

What is a radio telescope?

A

A large concave metal disc and ariel used to detect radio waves from space.

24
Q

What is an optical telescope?

A

An instrument consisting of a lenses and mirrors to make distant images appear brighter or larger.

25
Q

What is technology?

A

Scientific knowledge that can be used to develop equipment and processes that can in turn be used for scientific work.

26
Q

What is a systematic error?

A

If the data is inaccurate in a constant way. This is often due to the method being routinely wrong.

27
Q

What is sustainable development?

A

Using natural resources in a way which also conserves them for future use.

28
Q

What is a supernova?

A

The explosion of a massive star after fusion in its core ceases and the matter surrounding its core collapses on to the core and rebounds.

29
Q

What is stopping distance?

A

Breaking distance add thinking distance.

30
Q

What is static electricity?

A

Charge held by an insulator or an insulated conductor.

31
Q

What is the speed of a wave?

A

Distance travelled per second by a wave.

32
Q

What is speed?

A

Distance travelled per second in meters/second

33
Q

What is sound echo?

A

Sound waves from a source of a sound reflected from a smooth wall.

34
Q

What is a solar heating panel?

A

Sealed panel designed to use sunlight to heat water running through it.

35
Q

What is a solar cell?

A

Electrical cell that produces a voltage when in sunlight.

Physics (3 decks)

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