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Physics Unit 1

1.1: Basic physics

QuestionAnswer
What is a scalar quantity? A quantity with magnitude only
What are examples of scalar quantities? mass, density, time, temperature, distance
What is a vector quantity? A quantity with both magnitude and direction
What are examples of vector quantities? Displacement, force, velocity and acceleration
When adding quantities, what do we need to consider? direction
'We must remember to find the ___ of a resultant vector'? direction
What's the equation for density? p=m/v which is the same as kg/m*3
What's a moment? Product of a force and the perpendicular distance between the line of action of the force and the pivot
What's the equation for force and distance? Moment = force X distance
What are the conditions for equilibrium? The resultant force is zero The net moment is zero
What is the 'principle of moments'? If an object is in equilibrium, the resultant (or 'net') moment about any pivot is zero
' total clockwise moment = total ___ moment' Anticlockwise
What's the centre of gravity in an object? The point at which all the weight in an object is considered to act.
What name is given to the turning effect of a force? moment
Created by: william0709
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