mass + gravity

Question 1

what is mass?

Answer 1

• mass is the amount of matter an object contains
• inertia applies to all forms of mass
• base units are kilograms/kg

Question 2

what is weight?

Answer 2

weight is the gravitational force acting upon an object, in the case of earth, 9.8N per kilogram

Question 3

what is gravity?

Answer 3

gravity is a force that acts between any 2 masses

Question 4

which two factors affect gravitational attraction between two objects?

Answer 4

1. mass
2. distance

Question 5

general rules of gravity

Answer 5

1. if mass increases, the force of gravity increases
2. if distance increases, the force of gravity decreases

Question 6

formula for finding gravitational pull of two objects

Answer 6

F = G x [(m1 x m2)/d x d]

Question 7

what is the universal gravitational constant?

Answer 7

6.67 x 10*-11

Question 8

what is the gravitational acceleration near the earth’s surface?

Answer 8

9.8 ms*-2

Question 9

why is the gravitational acceleration constant, even though the mass of different objects are different?

Answer 9

the gravitational constant is 9.8N ms*-2, therefore for every kg, 9.8N will be applied.

Question 10

what is drag force?

Answer 10

resistance forces created by air, water, etc.

Question 11

drag vs acceleration

Answer 11

the faster an object falls the greater the drag

Question 12

what is terminal velocity?

Answer 12

if an object falls for long enough, the drag will equal the weight of the object, causing the object to fall at a constant speed. this is called terminal velocity

Question 13

what are some factors which affect drag?

Answer 13

1. surface area/shape
2. size/volume
3. sped