rotational and gravity test

Question 1

Tangential speed

Answer 1

speed in 90 degree angle radius

Question 2

Rotational speed -

Answer 2

measured in revolutions per unit of time

Question 3

Rotational inertia

Answer 3

tendency to resist change in rotational motion

Question 4

Torque

Answer 4

causes rotational motion

Question 5

Center of mass

Answer 5

average position of mass

Question 6

Center of gravity

Answer 6

average position of weight

Question 7

Centripetal force

Answer 7

directed towards the center of rotation

Question 7

G

Answer 7

6.67 x 10 ^-11

Question 7

Angular momentum

Answer 7

inertia of rotation

Question 7

Equilibrium

Answer 7

E T = 0

Question 8

Weight

Answer 8

Mg

Question 9

Weightless -

Answer 9

without support force

Question 10

Spring tides

Answer 10

the sun, moon and earth are all in a straight line

Question 11

Neap tides

Answer 11

the moon is midway between new and full

Question 12

Gravitational field

Answer 12

influence that a massive extends into the space around it

Question 13

Black hole -

Answer 13

not even light can escape

Question 14

What is the law of conservation of angular momentum?

Answer 14

If not extended torque acts on a rotating system the angular momentum of the system remains constant

Question 15

What is centrifugal force?

Answer 15

A friction force that makes you feel like you are being pulled/pushed outward. (aka inertia)

Question 16

Explain the law of universal gravitation. What is the equation?

Answer 16

Two bodies of mass will attract each other in relation to their size and the square of the distance between them
F ~ m1m2/d2
F =G m1m2/d2
G= 6.67 x 10^-11

Question 17

What is inverse square law? Draw an example

Answer 17

A law relating to the integrity of an effect to the inverse square of the distance from the cause

Distance area integrity
1 1^2 = 1 1/1 ^2 =1
2 2^2 = 4 1/2^2 = 1/4
3 3^2 = 9 1/3^2 = 1/9\

Question 18

Torque formula -

Answer 18

F x L = (N x M)

Question 19

Centripetal force formula

Answer 19

mv/r ^2= (N)

Question 20

Angular motion formula

Answer 20

mvr = kg x m^2 /s

Question 21

Gravity formula

Answer 21

F (N) = G m1m2/d2

Question 22

What is simulated gravity? How does it work?

Answer 22

• Real gravity is the relationship between two masses and the distance between them. (F ~ m1m2/d2)
• The force creates an acceleration (on earth its 9.8 m/s2)
• Simulated gravity recreates the acceleration through rotation, where
  -acceleration is related to a mass given a certain amount of rotational speed at an appropriate radius from the center ,

C = mw^2/r

Question 23

draw neap tides

Answer 23

tides are less than average due to pull in two directions by sun and moon
vertical moon orbit

Question 24

draw regular tide

Answer 24

Moon causes bulge on both sides due to gravitational attraction of the h20 and squeeze effect

orbit all around

Question 25

Spring tides

Answer 25

tides are greater than average due to pull by moon and sun in same direction