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Science NCEA Level 1 > Mechanics - Motion > Flashcards

Mechanics - Motion Flashcards

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1
Q

Define speed

A

The distance an object travels over a given time

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2
Q

What is the formula for speed?

A

v = d/t

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3
Q

What units is speed calculated in?

A

ms-1

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4
Q

Define acceleration

A

The change in speed of an object in a given time

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5
Q

What is the formula for acceleration?

A

a = change in velocity/change in time

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6
Q

What units is acceleration calculated in?

A

ms-2

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7
Q

In a distance-time graph, what trend represents constant speed?

A

diagonal line

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8
Q

In a distance-time graph, what trend represents acceleration?

A

curve sloping upwards

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9
Q

In a distance-time graph, what trend represents stationary?

A

horizontal line

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10
Q

In a distance-time graph, what trend represents deceleration?

A

upwards line curving off

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11
Q

In a speed-time graph, what trend represents stationary?

A

horizontal line along with bottom of the graph in line with 0 on the y axis

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12
Q

In a speed-time graph, what trend represents constant speed?

A

horizontal line that does not line up with 0ms-1 on the y axis

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13
Q

In a speed-time graph, what trend represents acceleration?

A

diagonal line heading upwards

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14
Q

In a speed-time graph, what trend represents deceleration?

A

diagonal line heading downwards

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15
Q

By calculating the slope of the line on a distance-time graph, what type of motion are you trying to find out?

A

constant speed

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16
Q

By calculating the slope of the line on a speed-time graph, what type of motion are you trying to find out?

A

acceleration

17
Q

How do you work out the slope of a line on either graph?

A

vertical rise/horizontal run

18
Q

How do you calculate the total speed covered on a speed-time graph?

A

Work out the area under the line.
If it is a rectangle, use the formula d=bxh (d = distance in metres)
If it is a triangle, use the formula d = 1/2 x b xh

19
Q

Name the four forces acting on an object

A

Upwards = support
Downwards = weight
In the direction of movement = thrust
Against the direction of movement = friction/drag

20
Q

What is the net force?

A

The difference in size between two opposite forces

21
Q

How do you calculate net force?

A

F=ma

22
Q

Discuss the net force acting on an object that is stationary

A

The opposite forces are balanced because the object is not moving therefore there is no net force acting on the object

23
Q

Discuss the net force acting on an object that is moving at constant speed

A

The opposite forces are balanced because the object is moving at constant speed therefore there is no net force acting on the object

24
Q

Discuss the net force acting on an object that is accelerating

A

The opposite forces are unbalanced. Thrust is greater than friction because the object is accelerating. Therefore there is a net force acting IN the direction the object is moving

25
Q

Discuss the net force acting on an object that is decelerating

A

The opposite forces are unbalanced. Friction is greater than thrust because the object is decelerating. Therefore there is a net force acting AGAINST the direction the object is moving

26
Q

How do you calculate weight force?

A

F = ma (acceleration due to gravity is 10ms-1)

27
Q

When an object is falling straight down, what two forces are acting on the object?

A

Weight force and friction

28
Q

When an object is falling and the weight force pulling them down is equal to the friction/drag force slowing them down, what do we call this?

A

Terminal velocity

29
Q

When you open a parachute, explain why the friction force increases?

A

A parachute has a large surface area and therefore more air particles will collide with parachute which increase friction/drag

Science NCEA Level 1 (10 decks)

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