[FWE] force, work done and energy Flashcards
what is energy?
energy is the capacity to do work
what is potential energy?
potential energy is the stored energy due to an object’s position or condition
what is chemical potential energy?
chemical potential energy is stored in fuels and can be released through chemical reactions
what is elastic potential energy?
elastic potential energy is the energy an object has when stretched or compressed
what is gravitational potential energy?
it is the energy an object has due to it position, it is affected by mass and height
what is kinetic energy?
kinetic energy is energy due to an object’s motion, depending on mass and speed
in what forms can energy be transferred?
energy can be transferred as heat, light, sound or electrical energy
what is the principle of conservation of energy
energy cannot be created or destroyed but can be transferred or converted between forms
what are some examples of energy resources?
fossil fuels, solar energy wind energy, hydroelectric energy, geothermal energy, biofuels and nuclear energy
what is a force?
a force is either a push or a pull that can change an object’s shape, size, speed or direction
what units are used to measure force?
the nSI unit for force is Newton(N)
what is elastic force?
elastic force returns a stretched or compressed elastic object to its original shape
what is friction?
friction opposes motion between surfaces in contact
what are the seven ways friction can be reduced?
friction can reduced by using smooth surfaces, wheels, rollers, ball bearings, lubricants, air cushions, or adopting streamlined shapes
what is a magnetic force?
magnetic force acts between two magnetic poles of a magnet
what is weight?
weight is the gravitational force acting on an object
what is mass?
mass is the amount of matter in a body
what’s the difference between weight and mass?
mass only has magnitude, while weight has both magnitude and direction
what is electrostatic force?
electrostatic force is the force that acts between two charged particles
how can a force affect an object?
it can change the object’s
- speed
- direction
- cause a turning effect
- exert pressure
what is the resultant or net force?
if forces are balanced, there is no net force. if it is unbalanced, there is a net force
what is pressure and its SI?
pressure is defined as force per unit area
its SI is Pascal (Pa)
how is work done defined?
work done is when a force applied to an object causes it to move in the direction of the force
what units are used to measure work done
SI unit: joule (J)
