7 Flashcards
Define Newton’s First Law.
An object will continue to stay at rest, or move at constant velocity, unless a resultant force acts upon it.
Define Newton’s Third Law.
When two objects interact, they exert equal and opposite forces on each other.
What are the four fundamental forces?
.Gravitational - mass in a gravitational field.
.Electrostatic - between charged particles.
.Strong nuclear - between protons and neutrons.
.Weak nuclear - governs some radioactive decays.
What is momentum?
Mass x velocity (vector).
What is the conservation of momentum?
For a system of interacting objects, the total momentum in a specified direction remains constant, as long as no external forces act on the system.
Define elastic collision.
Momentum, energy and kinetic energy are conserved.
Define inelastic collision.
Momentum and energy are conserved but kinetic energy is not (thermal).
What is Newton’s Second Law?
The net force acting on an object is directly proportional to the rate of change of it’s momentum.
F Prop. Change P /Change t
Define impulse.
Impulse of a force is defined as the product of force and the time for which this force acts on an object. Ft - Ns.
What is the equation of impulse?
Ft = mv - mu.
What is the area under a Force-time graph?
Impulse.
How do you find momentum of a collision?
Triangle of momentum.
What is the other method of finding momentum after a collision?
Before:
x - p = mv.
y - 0.
After:
x - m1v1cos + m2v2cos
y - m1v1sin + m2v2sin
