Ch 4- Gravity

Question 1

Gravitational fields

Answer 1

Always pulls to centre of object
Effect of gravity is greatest when closer to the object
Inversely proportional to r2 (distance)

Question 2

Newton’s universal law of gravitation

Answer 2

Force due to gravity is proportional to masses but inversely proportional to distance
R-distance from CENTER to CENTER

Question 3

Altitude

Answer 3

Distance from center object to surface of planet

“r” is combined distance of radius of earth & altitude of object

Question 4

Elevator questions

Answer 4

Going up- Fn is bigger than Fg, feels heavier
Going down- Fn smaller than Fg, feels lighter
Fn is apparent weight
Fg is true weight
Apparent weight= apparent mass x g
If speed is constant Fn=Fg

Question 5

Mass vs weight

Answer 5

Mass-constant, independent

Weight- varies (9.81 varies from place to place), dependent on location