formulas Flashcards
1
Q
Speed
A
=Distance/time
2
Q
Acceleration
A
=Change in speed/time taken
3
Q
Weight(N)
A
=Mass(kg)x gravitational field
4
Q
Density(kg/m^3)
A
=mass/volume
5
Q
Hooke’s Law(N)
A
=Spring constant(N/M) x extension(m)
6
Q
Newton’s second law
A
=mass x acceleration
7
Q
Pressure(Pa)
A
=Force/Area
8
Q
Work done
A
=Force x distance
9
Q
Kinetic energy
A
=1/2 mass x velocity^2
10
Q
Gravitational Potential Energy
A
=mass x gravitational field x height
11
Q
Power (W)
A
=Energy/time
12
Q
Efficiency (%)
A
= Useful Energy outupt/ total energy input x 100 (%)
13
Q
Wave speed
A
= frequency x wavelength
14
Q
Reflection
A
angle of incidence = angle of refraction
15
Q
Refraction
A
= sin (incidence)/ sin (refraction)= refractive index
