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N5 Physics > Dynamics > Flashcards

Dynamics Flashcards

1
Q

Groups of physical quantities

A

Scalars and vectors

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2
Q

Scalars

A

A quantity completely described by stating its magnitude (size)

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3
Q

Vectors

A

A quantity completely described by stating its magnitude (size) and direction

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4
Q

Vector or scalar?

Distance

A

Scalar

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5
Q

Vector or scalar?

Speed

A

Scalar

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6
Q

Vector or scalar?

Time

A

Scalar

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7
Q

Vector or scalar?

Energy

A

Scalar

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8
Q

Vector or scalar?

Temperature

A

Scalar

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9
Q

Vector or scalar?

Pressure

A

Scalar

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10
Q

Vector or scalar?

Mass

A
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11
Q

Vector or scalar?

Current

A

Scalar

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12
Q

Vector or scalar?

Voltage

A

Scalar

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13
Q

Vector or scalar?

Volume

A

Scalar

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14
Q

Vector or scalar?

Area

A

Scalar

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15
Q

Vector or scalar?

Resistance

A

Scalar

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16
Q

Vector or scalar?

Frequency

A

Scalar

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17
Q

Vector or scalar?

Displacement

A

Vector

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18
Q

Vector or scalar?

Velocity

A

Vector

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19
Q

Vector or scalar?

Acceleration

A

Vector

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20
Q

Vector or scalar?

Force

A

Vector

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21
Q

Vector or scalar?

Weight

22
Q

Displacement

A

A line from point A to B with the distance and direction, a vector

23
Q

Velocity

A

Speed with a direction from A to B, a vector

24
Q

Acceleration

A

The change in velocity, makingit a vector (because velocity is a vector)

25
Force
An interaction that causes a change in shape, speed or direction, so a vector
26
Weight
The downward force applied to an object, a vector (because force is a vector)
27
How are vectors drawn?
A line with an arrow | Starting point is the tail, arrow end is the tip
28
Adding vectors going in the same direction
The magnitude of the vectors are added to give the resultant vector | Both must be going the same direction, e.g. 2N right and 7N right is 9N
29
Adding vectors going in different vectors
Larger force - smaller force (the answer is in the direction of the larger force) | E.g. 7N left and 5N right is 7N - 5N = 2N left
30
Adding vectors going in different directions
Create a triangle with the vectors and opposite and adjacent, use pythagoras to find the distance and SOHCAHTOA to find the direction | The direction must be in bearings
31
Velocity-time graph
Describes the motion of an object
32
Time on a velocity-time graph
X-axis
33
Velocity on a velocity-time graph
Y-axis
34
Acceleration of a velocity-time graph
Shown by the gradient
35
What shows whether a vehicle is accelerating, decelerating, or moving at a constant velocity on a velocity-time graph?
The shape of the graph
36
Displacement on a velocity-time graph
The area under the graph
37
Acceleration
The rate that velocity changes
38
A force can change...
The shape, speed, and direction of an object
39
Friction
A resistive force, which acts in the opposite direction to the relative movement of two surfaces
40
Friction depends on...
How rough the two surfaces are, the size of the force between the two objects
41
Newton's first law
* If balanced forces are applied to a body that is not moving, the object will remain at rest * If balanced forces are applied to a body that has velocity, the object will remain moving at that velocity | Two forces with equal sizes but act in opposite directions are balanced
42
Newton's second law
The acceleration of an object is directly proportionate to the magnitude and inversely proportionae to the mass | F=ma
43
What does the acceleration have to be produced by in Newton's second law
Unbalanced forces
44
Mass
The amount of matter in a object, doesn't change from place to place
45
Weight
A force caused by gravity acting on an object's mass
46
Strength of gravity
The gravitational field strength
47
Resultant forces
The result of multiple different forces acting on an object
48
Gravitational field strength and acceleration are...
Equal
49
Work done
A measure of the energy transformed | The force multiplied by the distance it moves
50
Newton's third law
If object A exerts a force on object B, then object B will exert an equal, but opposite force on object A

N5 Physics (6 decks)

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