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Flashcards in Unit 2 Deck (17)
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1

Any object with a constant velocity has...

...no acceleration

2

any object that IS experiencing an acceleration (of any kind) must have a...

...net force acting on it.

3

acceleration equation

a = net force/mass = f/m (m/s^2)

4

terminal speed

when air resistance and weight are in balance.

5

air resistance equation

a = Fnet/m = (mg-R)/m where mg is weight, R is air resistance

6

What causes an object to accelerate?

Unbalanced forces acting on an object.

7

acceleration is directly proportional to...

net force

8

acceleration is inversely proportional to...

1/mass

9

The force of friction between surfaces depends on...

the kinds of material in contact and how much the surfaces are pressed together.

10

pressure equation

pressure = force/area of application. Measured in pascals (Pa).

11

air resistance

air resistance force ~ speed * front area

12

terminal velocity

when terminal speed is together with the direction of motion.

13

Force is always part of...

a mutual action that involves another (equal and opposite) force. Action/reaction forces.

14

Action and reaction forces are...

equal in strength and opposite in direction

15

Lift

The upward force that causes helicopters, birds, and airplanes to fly

16

Newton's Second Law

The acceleration of an object is proportional to the net force on the object and inversely proportional to the object's mass.

17

Force equation

F=ma = m*[(v1-v2)/t]