newton's laws Flashcards
1
Q
first law?
A
an object at rest will remain at rest and an object in motion continues in motion with the same speed and direction unless acted upon by an unbalanced external force.
also known as: law of inertia
2
Q
second law?
A
when an unbalanced external force acts on a mass its motion will change; it will accelerate
the greater the mass, the greater the amount of force needed
3
Q
third law?
A
forces occur between objects and always occur in pairs.
for every action force, there is an equal and opposite reaction force.
4
Q
formula for acceleration/force
A
a = F/m
F = ma
