Forces (work, effects and matter) (topic 8,9 and 15) Flashcards
What is the equation for work done?
Force x distance
What is the equation for weight?
Mass x 9.81(gravitational field strength)
What is a scalar quantity?
Just Magnitude
What is a vector quantity?
Magnitude with direction
What is the equation to work out weight?
mass x gfs (9.81)
What is the equation for work done against gravity?
weight x distance
What is work done?
The amount of energy transferred measured in joules
What is power?
The rate of work done so how fast the energy is transferred
What is the equation to work out power?
work done/time
or
energy transferred/time
How do you find the resultant force when there is a direction?
1) Draw a triangle with the two forces labelled and choose an appropriate scale factor (e.g. 1cm = 5m)
2) measure the hypotenuse and times by the scale factor to find resultant force
2) Work out the hypotenuse using a2 + b2 = c 2 to check
What is the equation to work out pressure?
force/area
What is the equation to work out pressure in a fluid?
height x density x 9.81
What is atmospheric pressure? (actual number)
100,000 pascals
What is up thrust?
The difference between the pressure above and the pressure below
What is elastic deformation?
when a an object will return to its original shape after the forces stretching it have been removed
