Newtonian Mechanics
- Created by: LeahhJanee
- Created on: 22-03-17 11:20
View mindmap
- Newtonian Mechanics
- Newton's First Law
- An object in rest stays in rest and an object in motion stays in motion with the same speed and direction until acted upon by an unbalanced force
- Also known as the Law of Inertia
- If a ball is launched in a vacuum, it will carry on going forever
- Newton's Second Law
- Force is proportional to acceleration (normally) as mass is constant
- If the question is about a rocket and it loses fuel, remember m isn't constant
- F = ma
- Force is proportional to acceleration (normally) as mass is constant
- Newton's Third Law
- For every action, there's an equal and opposite reaction
- Reaction pairs
- Friction and driving force
- Gravity and the reaction force from the ground
- Gravity and air resistance
- Air resistance and driving force
- SUVAT equations
- v = u + at
- v^2 = u^2 + 2as
- s = ut + 1/2at^2
- a = (u+v)t/2
- Scalar and vector quantities
- Scalar = only magnitude
- Speed
- Mass
- Distance
- Vector = magnitude and direction
- Displacement
- Velocity
- Acceleration
- Scalar = only magnitude
- Momentum = mass x velocity
- Conservation of linear momentum = the momentum doesn't change unless an external, unbalanced force is applied
- m1v1 = m2v2
- Moments
- Moment of a force = Fx
- Where x is the perpendicular distance between the line of action of the force and the axis of rotation
- Also known as torque
- Torque of a couple = Fd
- Where d is the perpendicular distance between the two forces
- Couple = two equal forces which act in opposite directions on an object but not through the same point so they produce a turning effect
- Moment of a force = Fx
- Work and energy
- ?W = F?s
- If the force isn't in line with the motion, resolve the vectors
- Kinetic energy = 1/2mv^2
- Principle of conservation of energy = energy cannot be made or destroyed; only transferred
- P = W / t
- Efficiency = useful energy / total energy
- x100 for percentage
- ?W = F?s
- Gravity
- Gravitational field strength = F / m
- Weight = mg
- g = 9.81 ms^-2
- Newton's First Law
Comments
No comments have yet been made