Topic 3 - Dynamics Flashcards
State
Newtons First Law of Motion
A body will remain at rest or move with constant velocity unless acted upon by a resultant force
State
Newtons Second Law of Motion
A resultant force acting on a body will cause a change in momentum in the direction of the force. The rate of change of momentum is proportional to the magnitude of the force.
State
Newtons Third Law of Motion
When two bodies interact, the forces they exert on each other are equal and opposite
Why is an object in equilibrium?
The forces acting on the object are balanced
Equation
Weight
Newtons
mass * acceleration of a free fall
Kg -
Equation
Linear Momentum
kgms^-1
mass * velocity
Equation
Resultant Force
mass * acceleration
acceleration and resultant force act in the same direction
Define
Weight
the effect of a gravitational field on a mass
Define
Mass
a measure of the amount of matter in an object
What is force in terms of momentum?
Force is the rate of change of linear momentum
State
conditions for a force pair
- must be the same type of force
- the same magnitude (no resultant force)
- Acting in opposite directions
- Forces act
Equation
Thrust force
mg sinϴ
Equation
Force opposite the normal force
mgcosϴ
State
Principle of conservation of momentum
the total momentum of a system remains constant, provided no external forces act on it
∑ momentum before = ∑momentum after
What is an Elastic collision?
when two bodies interact, linear momentum is conserved and kinetic energy is conserved
