Momentum
A collision where kinetic energy is conserved.
What is an elastic collision?
This is the definition of the moment of a force about a pivot.
What is "the product of the force and the perpendicular distance from the line of action of the force to the pivot."
You need this to plot the points.
What is a sharp pencil?
The SI unit of mass.
What is the kilogram?
This depends on the systematic error.
What is accuracy?
A collision where kinetic energy is not conserved.
What is an inelastic collision?
This is the definition of the centre of gravity of an object.
What is the point at which the weight of an object can be considered to act?
You need this to draw a straight line.
What is a 30 cm ruler?
Kilograms per cubic metre.
What are the units of density?
When we repeat a measurement, but get a different result each time.
What is random uncertainty?
The resultant force on an object is the rate of change of momentum.
What is Newton's 2nd Law?
Two equal and opposite forces that act at different points on a body and produce rotation only.
What is the definition of a couple?
This is the amount of space you need to use to plot the points.
What is at least half the page?
There are 7 of these in the SI units.
What is a base SI unit?
When we multiply two values, this is how we find the uncertainty in the result.
What is 'adding the % uncertainties'?
During a collision, the forces that the objects exert on each other are equal and opposite.
What is Newton's 3rd Law?
Students often confuse this word with 'moment'
What is momentum?
When finding this, you need to mark points on the line.
What is the gradient?
Made up of 2 units combined together, m/s is an example of this type of unit.
What are derived units?
When we cube a value, this is how we find the uncertainty in the result.
What is 'multiply the % uncertainty by 3'?
There are none of these acting if momentum in a system is conserved.
What are external forces?
This is the principle of moments.
What is the idea that in equilibrium, the sum of the clockwise moments equals the sum of the anticlockwise moments about the same point?
The equation of a straight line.
What is y = mx + c?
When the units are the same on both sides of an equation.
What is an homogenous equation?
When we take a square root, this is how we find the uncertainty in the result.
What is 'divide the % uncertainty by 2'?