Dynamics Flashcards
What does Newton’s 2nd Law state?
The rate of change of momentum of a body is proportional to the applied force and takes place in the direction in which the force acts.
F = m x a
What is Newton’s 1 law?
A body at rest remains at rest and a body in motion continues to move at a constant velocity unless acted upon by an external force.
(Inertia)
What is Newton’s 3rd law ?
Every action has an equal and opposite reaction
Formula for weight
M x g
Density equation
Mass / volume
Formula for work
Force x distance
Unit of work
Nm or J
What is power
Measure of the rate at which work is done
Formula for power (W)
Energy used / time taken
Equation for GPE
M x g xh
What is kinetic energy
Movement energy
Formula for kinetic energy
KE = 1/2 mv^2
2 types of mechanical energy
Kinetic and potential
What is thermal energy
Heat Or internal energy. Energy body has because of kinetic energy and potential energy of its molecules.
What is the conservation of energy
Cannot be created or destroyed but it can change from one thing to another
What is an in elastic collision
When two objects collide they stick.
Formula for elastic
M1U1 + M2U2 = M1V1 + M2V2
Formula for inelastic
M1V1 + M2V2 = (M1 + M2) V
Equation for momentum
Mass x velocity
What is the unit of impulse
Ns
What is impulse
Change in momentum
Formula for impulse
Ft = m delta v
What is a gyroscope
Spinning mass
Two properties of gyroscopes
Rigidity - related to law of inertia
Precession ( right angle obstinacy)
What is a perfect gyro
A free gyro
Define friction
Work done as two surfaces rub against each other
Equation for friction
F = wm
What are the three kinds of friction
Starting friction
Sliding friction
Rolling friction
