Describing movement Flashcards

1
Q

What is a distance-time graph?

A

A distance-time graph plots distance travelled on the vertical axis and time on the horizontal axis to describe the movement of an object.

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2
Q

Why are graphs more useful than words for describing movement?

A

Graphs are useful because:

•	They make it easier to see trends and patterns.
•	You can read any value of distance or time from the graph.
•	Other values, such as speed, can be calculated from the graph.
•	They provide a clear overview of the entire journey.
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3
Q

How can speed be calculated using a distance-time graph?

A

can be calculated from the slope of the graph:

Speed= Distance/ Time

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4
Q

Describe the movement shown by a straight, upward-sloping line on a distance-time graph.

A

A straight, upward-sloping line represents constant speed. The object is travelling the same distance in each second.

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5
Q

What does a horizontal line on a distance-time graph represent?

A

A horizontal line represents an object that is stationary (at rest), meaning it is not moving, and the speed is zero.

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6
Q

In a distance-time graph, what does the starting point A represent?

A

The starting point A represents the initial position of the object where the distance travelled is zero.

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7
Q

Explain the movement from point A to point B as shown in the distance-time graph.

A

From A to B, the object travels at a constant speed, as indicated by the straight, upward-sloping line.

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8
Q

What does the term “stationary” mean in a distance-time graph?

A

Stationary means the object is not moving, and the speed is zero. The distance does not change, but time continues to pass.

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9
Q

What does a steeper straight, upward-sloping line represent on a distance-time graph?

A

A steeper straight, upward-sloping line represents an object moving at a faster speed. It covers a greater distance in each second.

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10
Q

What does a straight, downward-sloping line indicate in a distance-time graph?

A

A straight, downward-sloping line indicates that the object is returning to the starting position, and the distance from the start is decreasing.

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11
Q

In a distance-time graph, what does it mean if there is a horizontal line?

A

A horizontal line means that the object is stationary, with no change in distance over time.

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12
Q

What is the equation to calculate speed using a distance-time graph?

A
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13
Q

A train leaves station P at time 0 and travels to station R, which is 2000 m away, in 200 s. What is the speed of the train from P to R?

A
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14
Q

After stopping at station R for 140 s, the train travels back to station P in 100 s. What is the speed of the train on the way back from station R to P?

A
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15
Q

How can distance-time graphs be used for calculations?

A
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16
Q

What are the key events in the train journey example shown in the distance-time graph?

A
  1. The train leaves station P at time 0.
    1. It takes 200 s to travel from P to R.
    2. The train stops at station R for 140 s.
    3. The train returns to station P in 100 s.
17
Q

How far did the boat travel when crossing the lake once?

A

The boat traveled 80 meters when crossing the lake once, as shown by the peak of the graph on the y-axis.

18
Q

How do you calculate the speed of the boat crossing the lake the first time?

A

The speed is calculated by dividing the distance by the time. In this case, speed = 80 meters / 40 seconds = 2 meters per second.

19
Q

How much time did the boat spend stopped before crossing the lake again?

A

The boat was stopped for 60 seconds, as indicated by the flat part of the graph from 40 seconds to 100 seconds.

20
Q

How do you calculate the speed of the boat crossing the lake the second time?

A
21
Q

How much time did the boat take for the complete journey?

A

The total time for the complete journey was 132 seconds (crossing the lake twice and stopping in between).