Midterm 1 Review

Question 1

What do atoms consist of?

Answer 1

Every atom is composed of positively
charged nucleus, around which are
distributed a number of negatively
charged electron

Question 2

What was formed by the big bang?

Answer 2

Hydrogen and helium

Question 3

How were heavier elements than hydrogen and helium formed?

Answer 3

Nuclear fusion of stars

Question 4

what is average speed?

Answer 4

distance/time

Question 5

instaneous speed

Answer 5

speed at each moment that is the # your speedometer measures

Question 6

what is velocity?

Answer 6

speed & direction

Question 7

what is acceleration?

Answer 7

change in velocity per unit time

Question 8

If velocity is changing rapidly,

Answer 8

Big acceleration

Question 9

If velocity is changing slowly,

Answer 9

Small acceleration

Question 10

If velocity is constant,

Answer 10

No acceleration

Question 11

If velocity is decreasing,

Answer 11

Negative acceleration

Question 12

Due to air resistance, a feather will

Answer 12

a feather will… fall slowly

Question 13

If we remove air, a feather & a coin or a brick

Answer 13

a feather & a coin or a brick will fall w/ the same acceleration

Question 14

All objects fall with a _ acceleration

Answer 14

constant

Question 15

What happens in velocity in free fall?

Answer 15

v=gt or v=10t. With each second of the fall, speed increases by 10 m/s

Question 16

At 5m, how many seconds of fall?

Answer 16

1 second of fall

Question 17

At 20m, how many seconds of fall?

Answer 17

2 seconds of fall

Question 18

At 45m, how many seconds of fall?

Answer 18

3 seconds of fall

Question 19

If I drop a bullet at the same time I shoot a bullet horizontally, which will hit the ground first? (at same height)

Answer 19

Hit at the same time bc they fall at the same rate. Horizontal motion has no effect on vertical motion