Unit 2

Question 1

Any object with a constant velocity has…

Answer 1

…no acceleration

Question 2

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

Answer 2

…net force acting on it.

Question 3

acceleration equation

Answer 3

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

Question 4

terminal speed

Answer 4

when air resistance and weight are in balance.

Question 5

air resistance equation

Answer 5

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

Question 6

What causes an object to accelerate?

Answer 6

Unbalanced forces acting on an object.

Question 7

acceleration is directly proportional to…

Answer 7

net force

Question 8

acceleration is inversely proportional to…

Answer 8

1/mass

Question 9

The force of friction between surfaces depends on…

Answer 9

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

Question 10

pressure equation

Answer 10

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

Question 11

air resistance

Answer 11

air resistance force ~ speed * front area

Question 12

terminal velocity

Answer 12

when terminal speed is together with the direction of motion.

Question 13

Force is always part of…

Answer 13

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

Question 14

Action and reaction forces are…

Answer 14

equal in strength and opposite in direction

Question 15

Lift

Answer 15

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

Question 16

Newton’s Second Law

Answer 16

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

Question 17

Force equation

Answer 17

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