Dynamics (Unit 1) Flashcards
What is a force?
A force on a body is a push or a pull acting on the body from some external body
Newton’s Third Law?
If a body A exerts a force on a body B, then B exerts an equal and opposite force on A.
What are the rules of Newton Pairs?
- must act on different bodies
- must be equal in magnitude (and in opposite directions)
- forces must be of same type
Acceleration equation?
V-U/t
Resultant force?
The mass of a body ×its acceleration is equal to the vector sum of the forces acting on the body. This vector sum is called the resultant force.
Momentum?
Objects mass x velocity? Units = Ns or Kgms^-1
Elastic collision (kinetic energy)?
A collision in which there is no change in total kinetic energy.
Inelastic collision (kinetic energy)?
A collision in which kinetic energy is lost.
Newton’s Second Law?
The rate of change of momentum of an object is proportional to the resultant force acting on it, AND takes place in the direction of that force.
Force Units?
N or Kgms^-2
Questions about quality of experiment?
-Anomalies and too few points plotted
What kind of force is air resistance?
Contact force
Force equation? (Momentum)
Change of momentum/ time
Conservation of momentum?
The vector sum of the momenta of bodies in a system stays
constant provided there is no external force
Conservation of momentum?
The vector sum of the momenta of bodies in a system stays
constant provided there is no external force
