Vectors Flashcards

1
Q

Physical quantity

A

A measurement of something

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2
Q

Speed equation

A

Distance (m)/ Time (sec)

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3
Q

What is always on the x-axis

A

Time

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4
Q

How to find the displacement of a velocity time graph?

A

The area under the velocity time graph gives displacement

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5
Q

Upthrust/ buoyancy is a force cause by…

A

Pressure

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6
Q

In a free fall diagram what is not taken into account

A

Air resistance

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7
Q

What does upthrust depend on?

A

The density and volume of the liquid

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8
Q

When firing a projectile what are the horizontal and vertical speeds?

A

Horizontal speed stays constant

Vertical speed is only affected by gravity (and therefore has an initial velocity of 0)

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9
Q

For thinking distance, what is speed directly proportional to?

A

The distance
d=vt
v=d

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10
Q

For braking distance, what is speed directly proportional to?

A

Initial velocity squared

s=u^2

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11
Q

What are three methods you can use to measure acceleration due to gravity?

A
  • Using a timer and ball
  • Using 2 light gates (A and B)
  • Using an electromagnetic timer
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12
Q

What does the mass of an object depend on?

A

The amount of matter it contains (density)

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13
Q

A net (resultant) force acting on an object will…

A

Make the object accelerate in the direction of the net force.
F=ma

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14
Q

Mass

A

kg

It’s always constant for a specific object or particle

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15
Q

Weight

A

Nkgms-2

Magnitude is variable (as depends on the location, gravitational field strength)

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16
Q

What’s the equation for weight

17
Q

What’s the value of g for an object during free fall

18
Q

How can you determine the weight of an object

A

Use a Newtonmeter which is calibrated to show the gravitational force acting on an object in Newtons.

19
Q

Centre of gravity

A

Where the weight appears to act from

20
Q

When is the centre of gravity equal to the centre of mass

A

When we are in a uniformed gravitational field

21
Q

When does an object become unstable?

A

As soon as the centre of mass is off the base

22
Q

Centre of mass

A

Defined as the point where the mass is centred (the point has no turning effect)

23
Q

How do you find the centre of mass for an irregular 2D object?

A

Use a plumb bob, which makes a plumb line, that tells you the direction gravity is acting (downward direction)

24
Q

Moment

A

The turning effect of a force

25
Where would a moment act?
Around a pivot
26
Which direction can a moment act?
Clockwise or anti-clockwise
27
Moment equation
Moment= force x perpendicular distance to the line of action from the force Nm= N x m
28
In moments when is the object in equilibrium
When the forces and moments are balanced | F1d1=F2d2
29
Couple definition
Is defined as 2 equal and opposite forces acting on a body but on different lines of action
30
Torque
The moment produced by a couple
31
When does an object topple over?
When its weight is outside its base
32
What does stability depend on?
The width of the base | The height of the centre of mass
33
Unstable equilibrium
Push an object (apply a force) and it won’t return back to its original position
34
Stable equilibrium
An object will return back to its original position