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AQA P3.2 Using Physics to make things work
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By which two ways can objects be made more stable?
a wider base
a lower centre of mass
How can you find the centre of mass of a symmetrical object?
Find where the lines of symmetry intersect
How can you find the centre of mass of an asymmetrical object?
Suspend it from any two points and draw vertical lines from the suspension points. The centre of mass will be where the drawn lines intersect.
What is meant by the time period of a simple pendulum?
The time for one complete swing back to the starting position.
What is the relationship between the time period of a pendulum and its frequency?
What does the time period of a pendulum depend upon?
The length (from the pivot to the centre of mass)
What is the unit of frequency?
Hertz (Hz) (cycles per second)
What is the turning effect of a force called?
The moment
What does the turning effect of a force depend upon?
The size of the force
The perpendicular distance of the force from the pivot
(M = F x d)
If an object is not turning, what does it say about the total anticlockwise moment and the total clockwise moment?
They are balanced
Hydraulics use liquids. What property of liquids do they rely upon?
That they are virtually incompressible
In a liquid, which is transmitted equally in all directions: pressure or force?
Pressure
What is the Pascal (Pa) the unit of?
Pressure
In the equation
what does A represent?
The cross-sectional area (in metres squared)
In which direction does centripetal force act?
Towards the centre of the circle
What is the force called that keeps objects moving in a circle?
Centripetal force
What 3 things
increase
the size of the centripetal force required to keep objects moving in circular motion?
Increased mass
Increased speed
Reduced radius
Give examples of things that use hydraulics
Automotive braking systems
Earth moving equipment (diggers)
Fair ground rides
Hydraulic car jacks
Hydraulic press
Author
HLHSscience
ID
213206
Card Set
AQA P3.2 Using Physics to make things work
Description
AQA P3.2 Using Physics to make things work
Updated
2014-03-23T10:16:33Z
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