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Science > Mechanics > Flashcards

Mechanics Flashcards

1
Q

What is a scalar?

A

A physical quantity which has magnitude only

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2
Q

Simple examples of scalar quantities are…

A

Length
Mass
Time
Temperature

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3
Q

What is a vector?

A

A physical quantity which has both magnitude and direction

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4
Q

Resultant?

A

Single vector which has the same effect as all the component vectors

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5
Q

Maximum resultant?

A

•When two vectors act in the same direction
•Angle between them is 0
—Resultant is the sum of the magnitudes of the two vectors

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6
Q

Minimum resultant

A
  • When two vectors act in opposite direction
  • Angle between them is 180
  • Resultant is therefore the difference of the magnitudes of the vectors
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7
Q

How is position measured?

A

Relative to a reference point

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8
Q

Is position a vector or a scalar and why?

A

It is a vector since it has magnitude and direction in relation to the reference point

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9
Q

What is the si unit for position

A

Metre (m)

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10
Q

What is distance?

A

The length of the path taken

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11
Q

Distance;scalar or vector?

A

Scalar

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12
Q

Displacement?

A

A body’s change of position

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13
Q

Why is displacement a vector?

A

•One must know the distance from the reference point and the new position as well as the direction in which the body has moved

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14
Q

Speed?

A

Rate of change of distance moved

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15
Q

Speed;vector or scalar?

A

A scalar

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16
Q

What is instantaneous speed?

A

The speed at a particular moment

17
Q

Velocity?

A

The rate of change of position

18
Q

Is velocity a vector or scalar

A

Vector

19
Q

Instantaneous velocity?

A

Velocity at a particular moment

•Magnitude is equal to instantaneous speed but this also contains the object is moving at that instant

20
Q

Acceleration?

A

Rate of change of velocity

21
Q

Acceleration;vector or scalar?

A

Vector

22
Q

What does the gradient of a position vs time graph tell uss?

A

The velocity

23
Q

Why should the graph be a straight line for the position vs time?

A

Because the velocity is constant and gradient must be constant

24
Q

What gives the gradient at a particular point on a increasing velocity position vs time graph

A

The gradient of a tangent drawn

25
Q

What does the gradient of a tangent drawn give?

A

The instantaneous velocity at that point

26
Q

What does the gradient of a velocity vs time graph give?

A

The acceleration of a moving object

27
Q

What does the area under the velocity vs time graph give?

A

Displacement

28
Q

What are equations of motion for?

A

Bodies moving at a constant acceleration and in a straight line

29
Q

What is delta x

A

Displacement

Science (3 decks)

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