Chapter 6: Newton's Second Law
Terms in this set (21)
What is the equation for Newton's second law?
ΣF = ma
What does a net force acting on an object cause?
It causes the object to accelerate.
Newton's Second Law of Motion
An object's acceleration is directly proportional to the net force, inversely proportional to the object's mass, and in the direction of the net force.
A change in one quantity causes the other quantity to change by the same rate/amount.
A change in one quantity causes the other quantity to change by the opposite/ reciprocal.
A force that opposes motion between two surfaces that are in contact
What direction does friction act in?
The opposite direction of movement
What are the three types of friction?
Static, kinetic, and fluid friction
Friction that acts on stationary objects
Friction between two solid surfaces sliding against each other.
Friction between an object and the fluid through which it's moving.
What type of friction is air resistance?
What does kinetic friction depend on?
The two surfaces in contact with each other and the force with which they are pressed together.
Air Resistance (R)
The force of friction between a moving object and the surrounding air.
What does air resistance depend on?
Speed, area in the direction of motion, and density of the air
How much mass is packed into one area
How are speed, area, and density proportional to air resistance?
What makes objects aerodynamic?
Less surface area in the direction of motion
An object's velocity when R and Fg become equal and opposite falling at a constant speed
If a falling object has an upwards velocity, what direction is the air resistance?
The air resistance acts downwards.
What happens to an object if the net force is less than the friction?
The object will not move.