Physics formula

Question 1

Density

Answer 1

pho (kg/m^3 or g/cm^3) = mass/volume

Question 2

Gravitational field strength

Answer 2

g (N/kg) = weight (N)/mass(kg)

Question 3

Average speed

Answer 3

v (m/s or km/h) = total distance (km or m)/total time (hour/s)

Question 4

Velocity

Answer 4

v (m/s or km/h) = total displacement (km or m)/total time (hour/s)

Question 5

Acceleration

Answer 5

a = F(N)/m (kg) or a = change in velocity (m/s)/change in time (s)

Question 6

Pressure

Answer 6

p(N/m^2 or N/cm^2) = force (N)/ area (m^2 or cm^2)

N/m^2 = Pascal (Pa)

Question 7

Force (Hooke’s law)

Answer 7

F (N) = k (N/m) x (m)

Hooke’s law states that force is directly proportional to extension, up until a point called the limit of proportionality, where Hooke’s law no longer applies and the spring is permanently deformed.

Question 8

Moment

Answer 8

moment (Nm or Ncm) = F (N) * perpendicular distance (m or cm)

Question 9

Gravitational potential

Answer 9

E (J) = mass (kg)* gravitational acceleration (m/s^2)*vertical height (m)

Question 10

Kinetic energy

Answer 10

1/2mass(kg)velocity^2 (m/s)

1/2mv^2

Question 11

Work done (energy transferred)

Answer 11

Work done (J) = force (N) * distance moved in the direction of force (m)

Question 12

Power

Answer 12

Power (W) = work done (J)/time (s)

So watts are a.k.a joules per second