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Science Year 9 > Physics > Flashcards

Physics Flashcards

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1
Q

What is the definition of a quantity?

A

A quantity is something that we can measure about an object. It almost always has a unit.

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2
Q

Give an example of a scalar quantity and define it.

A

Example: Time. Definition: Time is a scalar quantity that represents the duration of an event or the interval between two events.

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3
Q

Provide an example of a vector quantity and define it.

A

Example: Displacement. Definition: Displacement is a vector quantity that measures the change in position of an object, taking into account both its magnitude and direction.

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4
Q

What is the difference between distance and displacement?

A

Distance is a scalar quantity that measures the total length of the path traveled by an object, while displacement is a vector quantity that measures the change in position from the starting point to the ending point.

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5
Q

Is speed a scalar or vector quantity? Explain.

A

Speed is a scalar quantity because it only indicates how fast an object is moving without specifying its direction.

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6
Q

Is velocity a scalar or vector quantity? Explain.

A

Velocity is a vector quantity because it includes both the speed of an object and the direction in which it is moving.

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7
Q

How is time measured, and is it a scalar or vector quantity?

A

Time is measured in seconds, and it is a scalar quantity because it only represents the duration of an event without indicating any direction.

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8
Q

Is mass a scalar or vector quantity? Explain.

A

Mass is a scalar quantity because it represents the amount of matter in an object and does not have any direction associated with it.

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9
Q

Define acceleration and specify if it’s a scalar or vector quantity.

A

Acceleration is a vector quantity that represents the rate of change of velocity of an object with respect to time, including both its magnitude and direction.

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10
Q

Give an example of a force and explain if it’s a scalar or vector quantity.

A

Example: Gravity. Force is a vector quantity because it involves both magnitude (like weight) and direction (like pulling downward).

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11
Q

Define scalar quantities.

A

Scalar quantities have magnitude (size, a number) but no direction associated with them.

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12
Q

Define vector quantities.

A

Vector quantities have both magnitude (size, a number) and direction associated with them.

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13
Q

What is the difference between distance and displacement?

A

Distance is a scalar quantity representing the total length of the path traveled, while displacement is a vector quantity representing the straight-line distance and direction from the start to the end point.

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14
Q

Define scalar quantities.

A

Scalar quantities have only magnitude (size) and no direction associated with them.

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15
Q

Provide examples of scalar quantities.

A

Examples of scalar quantities include time, mass, energy, and temperature.

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16
Q

Define vector quantities.

A

Vector quantities have both magnitude (size) and direction associated with them.

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17
Q

Provide examples of vector quantities.

A

Examples of vector quantities include displacement, velocity, acceleration, force, weight, and momentum.

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18
Q

Explain the concept of displacement using a journey analogy.

A

Displacement is like an arrow pointing from the starting point to the ending point of a journey, indicating how far you are from the start and in what direction.

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19
Q

Is speed a scalar or vector quantity? Why?

A

Speed is a scalar quantity because it only indicates the magnitude of how fast an object is moving, without specifying its direction.

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20
Q

Is velocity a scalar or vector quantity? Why?

A

Velocity is a vector quantity because it includes both the speed (magnitude) of an object’s motion and the direction in which it is moving.

21
Q

Differentiate between scalar and vector quantities in terms of their characteristics.

A

Scalar quantities have only magnitude, while vector quantities have both magnitude and direction.

22
Q

Give an example of a scalar quantity and explain why it’s classified as such.

A

Example: Time. Time only has a numerical value representing duration and does not have a direction associated with it.

23
Q

What defines a quantity?

A

A quantity is something that we can measure, and it is characterized by having a unit associated with it.

24
Q

What is speed?

A

Speed is the distance something travels in a certain time. It is a scalar quantity representing how fast something is moving, without indicating direction.

25
Q

What is velocity?

A

Velocity is the vector version of speed. It represents how far something travels in a certain time and in a particular direction.

26
Q

How is speed measured in standard units?

A

The standard unit of speed is meters per second (m/s), representing the distance traveled in one second.

27
Q

How is velocity measured in standard units?

A

Velocity is also measured in meters per second (m/s), indicating the distance traveled in a specific direction in one second.

28
Q

Describe the difference between speed and velocity.

A

Speed is a scalar quantity representing only the magnitude of motion, while velocity is a vector quantity representing both the magnitude and direction of motion.

29
Q

Give an example of calculating speed.

A

Example: A person runs with a speed of 5 m/s. In one second, they will travel 5 meters. In two seconds, they will travel 10 meters.

30
Q

Why is velocity considered a vector quantity?

A

Velocity includes both magnitude (speed) and direction, making it a vector quantity.

31
Q

How is direction represented in velocity measurements?

A

Direction in velocity measurements is indicated by positive or negative signs. Positive velocity indicates motion in one direction, while negative velocity indicates motion in the opposite direction.

32
Q

Is speed a scalar or vector quantity? Explain.

A

Speed is a scalar quantity because it only represents how fast something is moving, without indicating direction.

33
Q

Is velocity a scalar or vector quantity? Explain.

A

Velocity is a vector quantity because it includes both the magnitude of speed and the direction of motion.

34
Q

What is the velocity equation?

A

v=x/t where v is velocity in meters per second, x is displacement in meters, and t is time in seconds

35
Q

How do you measure speed using the velocity equation?

A

To determine the velocity of something, measure the distance it travels (displacement) and the time taken, then use the equation v=x/t

36
Q

What are the units for velocity in the velocity equation?

A

Velocity is measured in meters per second (m/s).

37
Q

How do you calculate velocity if you know displacement and time?

A

To calculate velocity, divide the displacement by the time taken: v=x/t

38
Q

What are common speeds that should be memorized?

A

Common speeds include the speed of sound, which is approximately 330 meters per second (m/s)

39
Q

What practical steps are involved in measuring speed?

A

To measure speed, you need to measure the distance traveled (using a ruler or tape measure) and the time taken (using a stopwatch or timer).

40
Q

Explain the significance of displacement in the velocity equation.

A

Displacement represents the change in position of an object, allowing for the calculation of velocity relative to a starting point.

41
Q

How can the velocity equation be applied in real-life scenarios?

A

The velocity equation can be used to calculate the speed of various objects or phenomena, such as vehicles, projectiles, or sound waves.

42
Q

speed of airliner

A

250m/s

43
Q

speed of high speed train

A

90 m.s

44
Q

speed of commuter train

A

55 m/s

45
Q

speed of moterway speed limit

A

31 m/s

46
Q

speed of ferry

A

18 m/s

47
Q

speed of speed limit in towns

A

10.5 m/s

48
Q

cycling

A

6 m/s

49
Q

walking 1.4 m/s

A

Science Year 9 (3 decks)

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