Forces Flashcards
units for distance
metres
units for mass
kg
units for speed
m/s
units for acceleration
m/s2
units for time
seconds
what is a physical quantity
something that can be measured
what is an independent variable
the thing that is changed
what is a dependent variable
the thing that is measured
what is a control variable
the things that are kept the same
what is an annomaly
a result that does not fit the pattern
define accuracy
how close your measurement is to the true value
define precision
the spread of values around the mean
define scalar quantity
size but no direction
define vector quantity
both size and direction
define force
a push or pull
define contact forces
Forces that can only act when objects are touching
define non contact forces
Forces that can act even when objects are not touching
What is a force?
a push or pull
State four examples of contact forces
friction air resistance, tension and normal contact force
Name three example of non-contact force
gravitational force, electrostatic force and magnetic force
What is weight?
The force acting on an object due to gravity pulling on its mass
What is mass?
the amount of matter an object contains
Write the equation linking weight, mass and gravitational field strength
weight = mass x gravitational field strength
Name the equipment used to measure weight (forces)
A Newtonmeter
Where does the weight of any object act from?
the centre of mass
Define ‘resultant force’
A single force found by adding up all of the individual forces acting on an object
