Midterm 1 Review Flashcards Preview

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Flashcards in Midterm 1 Review Deck (19):
1

What do atoms consist of?

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

2

What was formed by the big bang?

Hydrogen and helium

3

How were heavier elements than hydrogen and helium formed?

Nuclear fusion of stars

4

what is average speed?

distance/time

5

instaneous speed

speed at each moment that is the # your speedometer measures

6

what is velocity?

speed & direction

7

what is acceleration?

change in velocity per unit time

8

If velocity is changing rapidly,

Big acceleration

9

If velocity is changing slowly,

Small acceleration

10

If velocity is constant,

No acceleration

11

If velocity is decreasing,

Negative acceleration

12

Due to air resistance, a feather will

a feather will... fall slowly

13

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

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

14

All objects fall with a _ acceleration

constant

15

What happens in velocity in free fall?

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

16

At 5m, how many seconds of fall?

1 second of fall

17

At 20m, how many seconds of fall?

2 seconds of fall

18

At 45m, how many seconds of fall?

3 seconds of fall

19

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

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