07 laws of motion Flashcards
What is Newton’s first law?
An object will remain at rest or continue to move at a constant velocity unless acted upon by a resultant force.
What are the four fundamental types of forces?
- gravitational
- electromagnetic
- strong nuclear
- weak nuclear
What is newtons 3rd law?
When two objects interact, each exerts an equal and opposite force on each other.
What is the equation and unit for momentum?
p=mv, Kgms-2
What is the conservation of momentum?
When a system of objects interact, total momentum is conserved if no net force acts on the system.
What is an elastic collision?
Where kinetic energy is conserved.
What is an inelastic collision?
Where kinetic energy is not conserved.
What is Newton’s second law?
The net force acting on an object is directly proportional to the rate of change of its momentum, and is in the same direction.
What is net force proportional to?
rate of change of momentum.
F=ma is the same as…
f=change in momentum/change in time.
What is an impulse in words?
change in momentum.
What is the equation for an impulse?
f x t, Ns
What is the area under a force/time graph?
The impulse
What are 2 dimensional collisions also known as?
oblique collisions
Is momentum conserved in 2 dimensional collisions?
yes
