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Level 121

Newton's Second, Third Law & Momentum

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Newton's second law
Acceleration is produced when a force acts on a mass, the greater the mass, the more force is required to accelerate the object.
F = ma
Formula for Newton's Second Law
the acceleration increases
If you increase the force
the acceleration decreases
if you increase the mass
An object is moving if its position relative to a fixed point is changing.
Centripetal Force
A force directed towards the center of a circle that causes an object to follow a circular path
50 N
What force is needed to accelerate an object 5 m/s if the object has a mass of 10 kg?
unit of force
What is a Newton?
kg x m/s2
What is a Newton really?
the center
Which direction does centripetal force point towards?
Newton's Third Law
All forces come in pairs. The two forces in a pair act on different objects and are equal in strength and opposite in direction.
action force = jellyfish pushing on the water
What are the action / reaction force pairs associated with jellyfish motion?
different objects
action / reaction forces act on
a single object
balanced forces act on
(p) vector quantity describing the quantity of motion or inertia in motion. Recognizes that both mass and velocity have a part in the motion of an object and is proportional to both (is zero …
because it involves mass
momentum is similar to inertia
momentum is different than inertia
because it also involves speed
momentum formula
momentum = mass x velocity
conservation of momentum
the total momentum of a system of objects does not change, as long as no outside forces are acting on that system.