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Physics: Chapter 6: Newton's Second Law
Terms in this set (22)
What do unbalanced forces acting on an object cause the object to do?
How is acceleration proportional to the net force?
How is acceleration proportional to mass?
For a constant force, what will an increase in mass result in?
A decrease in the acceleration
What will the same force applied to twice as much mass result in?
Half the Acceleration
What does inversely mean?
Two values change in opposite directions.
What does Newton's second law state?
Acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, it is in the same direction as the net force, and is inversely proportional to the mass of the object.
What does the force of friction depend on?
The kinds of material in contact and how much the surfaces are pressed together.
Both liquids and gases are fluids because they flow.
What is air resistance?
The friction acting on something moving through air.
What is a free body diagram?
A diagram showing all the forces acting on an object.
For a constant force, what will an increase in the area of contact result in?
A decrease in the pressure.
What is pressure?
The amount of force per unit of area.
What are pascals? (Pa)
A unit used to measure pressure in Newton's per meter/centimeter.
Why do all freely falling objects fall with the same acceleration?
Because the net force on an object is only its weight, and the ratio of weight to mass is the same for all objects.
What does the air resistance force an object experiences depend on?
The object's speed and area.
What is terminal speed?
The speed at which the acceleration of a falling object is zero because friction balances the weight.
What is terminal velocity?
Terminal speed together with the direction of motion.
What do unbalanced forces on an object cause?
They cause the object to accelerate.
What are the three main equations?
1. a = F/m
2. F = ma
3. m = F/a
What is the equation for pressure?
P = F/A
What is the terminal speed downward with a parachute?
Between 15 to 25 km/h.