General Physics Flashcards
Momentum
Mass(kg) X Velocity (m/s)
Impulse
Force(N) X Time(s)
Newton’s Second Law
Force = mass X acceleration Force = Change in moment / Time Ft = Change in momentum (Mv-Mu)
Conservation of Momentum
Total momentum before collision = Total Momentum after the collision
Kinetic Energy
1/2 (Mass)(Velocity Squared) - joules
Density
Mass/Volume
kg/m3 to g/m3 = divide by a thousand
Pressure
Force over Area (pascals)
n/cm2 to n/m2 = multiply by a thousand
HDG
Pressure in Liquids
Transmitted throughout the liquid
Acts in all directions
Increases with depth
Acts uniformly at two same levels
Moment
Turning force.
Force(N) X Perpendicular Distance from the pivot (M)
(NM)
Equilibrium
Total force anticlockwise = Total force clockwise
Total force acting downward = Total force acting upwards
Hooke’s Law
As a force is applied on a spring increase, the extension aslo proportionally increases until the elastic limit has been reached
Force (N)= Spring Constant(n/m n/cm) X Extension (m/cm)
Principle of Energy Conservation
Total amount of energy before and after any conservation is constant.
Energy cannot be created nor can it be destroyed, it is transferred from one state to another.
Efficiency
Fraction of energy that makes the desired form of energy. - useful output energy
Useful energy output/Total energy input X 100
Laws of conservation of Momentum
Two objects in same direction:
(MV1+MV2)/(Mass1 + Mass2)
Two objects in the opposite directions:
(MV1-MV2)/(Mass1 + Mass2)
Laws of Motion
1: at=v-u (acceleration is the rate of change in velocity) 2: s=ut + 1/2a t squared s=((u+v)/2)X t 2s=((2u+at)/2) X t 3: v2=u2+2as
