3.4.1.3 - Motion Along A Straight Line Flashcards

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1
Q

V =

A

Change in displacement / change in time

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2
Q

Acceleration =

A

Change in velocity / change in time

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3
Q

What is instantaneous speed?

A

Speed given at any given point.

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4
Q

What is the average speed?

A

Total distance divided by the total time.

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5
Q

What does acceleration and deceleration look like on a displacement-time graph?

A

Curve down for deceleration, and a curve up for acceleration.

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6
Q

What does stationary look like on a displacement-time graph?

A

Horizontal line.

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7
Q

What does constant velocity look like on a displacement-time graph?

A

Straight line from the origin, diagonally upwards.

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8
Q

What does negative velocity look like on a displacement-time graph?

A

Straight line down \

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9
Q

How do you find the instantaneous velocity at a certain point on a displacement time graph?

A

Draw a tangent to the curve and then find its gradient using a triangle and change in y/change in x.

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10
Q

Acceleration =

A

Change in velocity / time taken

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11
Q

What does constant velocity look like on a velocity time graph?

A

Horizontal line.

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12
Q

What does constant acceleration look like on a velocity time graph?

A

/

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13
Q

What does decreasing acceleration look like on a velocity-time graph?

A

Curve downwards.

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14
Q

What does increasing acceleration look like on a velocity-time graph?

A

Curve upwards.

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15
Q

What does constant deceleration look like on a velocity-time graph?

A

\

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16
Q

How do you find the displacement on a velocity-time graph?

A

The area underneath the graph.

17
Q

On a velocity time graph, what would be the shape of a bouncing ball?

A

Up and down above and below the 0 line.

18
Q

What are the advantages of using a data logger?

A
  • More accurate as you don’t have to allow for human reaction times.
  • Much higher sampling rate than humans as it can take readings up to ten times a second.
  • You can see the data displayed in real time.
19
Q

What are the 4 uniform acceleration equations?

A
V = u + at
V^2 = u^2 + 2as
S = ut + 1/2at^2
S = (u+v)/2 x t
20
Q

What is free fall?

A

The motion of an object undergoing an acceleration of ‘g’.

21
Q

What is the only force acting on an object in free fall?

A

It’s weight.

22
Q

Describe an experiment to find g

A
  1. Using a ball bearing an a trapdoor time how long it takes for the ball to reach the door using varying heights.
  2. Use an electromagnet to release the ball bearing.
  3. Use a switch to simultaneously start the time and release the ball.
  4. Once you have obtained the results for varying h values plot a graph and calculate g using g = 2X (change in displacement/change in time squared)