Quiz 2b (10.08.2020)

Question 1

Newon’s second law relates__.

Answer 1

acceleration and force

Question 2

The acceleration produced by a net force on an object is ____ proportional to the net force, is in the same direction as the net force, and is indirectly proportional to the ____ of the object.

Answer 2

directly; mass

Question 3

If net force acting on an object is doubled ___.

Answer 3

the object’s acceleration will be doubled.

Question 4

If the mass of an object is doubled ___.

Answer 4

the object’s acceleration will be halved.

Question 5

The greater the mass of the object___.

Answer 5

the greater its force of attraction toward earth, the smaller its tendency to move (greater inertia)

Question 6

When an object falls downward through the air it experiences ___.

Answer 6

force of gravity pulling it downward and air drag force acting upward

Question 7

The condition of nonfree fall occurs when____

Answer 7

air resistance is nonnegligible

Question 8

Nonfree fall depends on two things:

Answer 8

speed and frontal surface area

Question 9

When an object is moving fast enough so that air resistance builds up to equal the force of gravity, then

Answer 9

no net force - no acceleration and velocity doesn’t change

Question 10

Terminal speed occurs when acceleration terminates (___)

Answer 10

when air resistance equals weight and net force is zero

Question 11

Terminal ___ is the same as terminal speed, but with direction implied or specified

Answer 11

velocity

Question 12

Coin and feather fall while air is present. The feather reaches terminal velociy very quickly and falls ____ at constant speed, reaching the bottom after the coin does. The coin falls very quickly and air resistance doesn’t build up to its weight over short-falling distance.

Answer 12

slowly