Newton's Second Law (f=m/a)

how great is the air resistance that acts on a 10N sack that falls in air constant velocity?

10N upwards

what is the acceleration of a falling object that has reached its terminal velocity?

10m/s

why doesn't a heavy object accelerate more than a light object when both are in free fall?

Because the greater mass offsets the equally greater force; whereas force tends to accelerate things, mass tends to resist acceleration.

does air resistance on a falling object increase or decrease with increasing speed?

decrease

what is the difference between force and pressure?

Force is a push or pull action between objects. Pressure is force acting on a surface area of an object, thus it is force per unit area.

if two quantities are inversely proportional to each other, does that mean as one increases the other increases?

No as one increases, the other decreases

is acceleration directly proportional to mass or is it inversely proportional to mass?

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

what is the formula for acceleration (using force and mass)?

a=f/m

What produces acceleration?

by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

what does free fall mean?

downward movement under the force of gravity only.

what, besides speed, affects the air resistance on a skydiver?

gravity

motion is affected by solid objects in contact. in what other situations does friction affect motion?

in fluids, in liquid or air

when do you produce more pressure on the ground...standing or laying down?

it's the same amount, there is just a different amount of area affected

suppose you exert a horizontal push on a crate that rests on a level floor, and it doesn't move. how much friction acts compared with your push?

less than or equal to the same amount

if the mass of a sliding block is tripled at the same time the net force is tripled, how does the resulting acceleration compare with the original acceleration?

the acceleration decreases to 1/3 of its original speed

if the net force acting on a sliding block is tripled, what happens to the acceleration?

the acceleration triples as well

if 2 objects of the same size fall through air at different speeds, which encounters the greater air resistance?

the one going slower