What is mass?
The amount of matter present in an object
kg
What is weight?
The gravitational downward pull of a planet on a certain mass
N
What is g?
Strength of gravitational field (10N/kg)
Acceleration of free fall (10ms^-1)
Weight = ?
W = mg
What is a newton?
The weight that acts on 100g on Earth
Force = ?
F = ma
What is energy?
The ability to do work
J
What is 1 Joule
The energy used to accelerate 1kg using 1N over 1m
What is GPE?
Gravitational Potential Energy
The ability to do work of a mass due to height
GPE = ?
mgh
J = kgN/kgm
What is KE?
Kinetic energy
The energy of a mass’s motion. Any object in motion has KE
J
KE = ?
½mv^2
What is work?
When a force causes an object to move in the direction of a force, it transfers energy from one object to another. No movement means no work (work is not being done until the object is moved).
J
Work = ?
W = fd
J = N * m
What is power (mechanics)?
Power is the rate at which work is done. If u are powerful u can do more work in a shorter amount of time.
P = W/T
Watts = J/s
What is 1 Watt?
1 Joule of work done each second
What is efficiency?
The efficiency of a process based on useful work inputted vs outputted. Expressed as %
Efficiency = ?
W out / W in
