 # Statics

Quiz by , created about 5 years ago

## Quiz on Statics, created by Nicole Saville on 10/27/2014. 17 0 0  Created by Nicole Saville about 5 years ago
P2a revision (part 1)
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### Question 1

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What is accuracy?
• How close the measurement is to the accepted value
• The degree to which you measure
• The skill of the experimenter
• The level of uncertainty

### Question 2

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The smallest scale increment on a measuring device is the...
• Precision
• Accuracy
• Reliablity
• Uncertainty

### Question 3

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What does the level of uncertainty depend on?
• Accuracy
• Precision
• Number of repeats

### Question 4

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All experiments are uncertain
• True
• False

### Question 5

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Which of these are systematic errors?
• experimental set up
• Human error
• faulty equipment
• inconsistent parallax error
• reaction time
• Zero errors on meters

### Question 6

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Which of the following does not apply to random errors?
• They reduce the accuracy
• The reduce the precision
• They can never be fully eliminated

### Question 7

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Systematic errors can be totally eliminated
• True
• False

### Question 8

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When adding or subtracting measured quantities, how do we find the uncertainty?
• Add the absolute uncertainty of each
• Add the percentage uncertainty of each
• Multiply the percentage uncertainties together
• Use the biggest absolute uncertainty

### Question 9

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When multiplying or dividing quantities, how do we find the uncertainty?
• Multiply the percentage uncertainties
• Double the uncertainty

### Question 10

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What is a scalar quantity?
• A quantity with magnitude only
• A quantity with magnitude and direction

### Question 11

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Which of these are scalar quantities?
• Distance
• Speed
• Velocity
• Current
• Acceleration
• Mass
• Density

### Question 12

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How do you combine scalar quantities?
• Multiply them
• Resolve them

### Question 13

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Momentum is a vector
• True
• False

### Question 14

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Force is a scalar
• True
• False

### Question 15

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How do you combine parallel vectors?
• Multiply/divide them
• Make them into a triangle and use pythagoras

### Question 16

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How do you combine vectors that are at random angles relative to each other?
• Add their magnitude and their angles
• Resolve them
• Use the parallelogram rule

### Question 17

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Upthrust is...
• The force on an object due to the difference in pressure when immersed in a fluid.
• The contact force of water
• The opposite of gravity

### Question 18

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Weight is...
• The force on an object due to gravity
• Gravity
• The mass of an object

### Question 19

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What is the pulling force exerted by a string, chain, cable or similar object?
• Tension
• Normal reaction force
• Weight
• Upthrust

### Question 20

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What is friction
• A force resisting the parallel movement of two surfaces in contact
• A force that slows down objects
• A force which prevents objects from sliding

### Question 21

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Which of these are fundamental forces?
• Strong Nuclear
• Weak Nuclear
• Gravitational
• Electromagnetic

### Question 22

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In which direction does weight act?
• Vertically downwards
• Perpendicularly downwards to the object
• Parallel to the surface

### Question 23

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In which direction does the normal reaction force act?
• Vertically upwards
• Perpendicular to the surface producing it
• Perpendicular to the object
• Parallel to the object

### Question 24

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If an object is in equilibrium it is static
• True
• False

### Question 25

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What does equilibrium mean?
• There are no forces acting on a body
• There is no resultant force
• A body is completely still
• A body is balanced

### Question 26

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What is a moment?
• The turning effect of a single force
• force x distance
• force x perpendicular distance
• weight x distance
• force/distance
• A pair of forces that are equal and opposite
• The forces on an object

### Question 27

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What is the principle of moments?
• The sum of the clockwise moments of an object = the sum of the anticlockwise moments of an object
• If an object is in equilibrium: the sum of clockwise moments = the sum of anticlockwise moments
• The sum of anticlockwise moments on an object can never fully equal the sum of clockwise moments on an object

### Question 28

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A couple of forces is two forces that are equal and opposite and acting in the same line
• True
• False

### Question 29

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What is torque?
• The moment of a couple
• Fd
• Fd/2
• The resultant of two perpendicular forces
• The distance of forces from the pivot

### Question 30

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What is pressure measured in?
• Nm^-2
• Nm^2
• N/m
• Pa

### Question 31

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Pressure = perpendicular force/area