# forces

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## Description and Tags

### 28 Terms

1

Weight

the force of weight acting on an object (N) (will change depending on the acceleration due to gravity)

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2

Mass

The amount of matter in the object. (kg)

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3

Inertia

an object ability to resit change in motion (the more it resists motion the higher the inertia is)

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4

Force (propbly not on test)

A push or pull on an object.

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5

newtons First Law

(the law of inertia) an object in motion will maintain its motion if no external forces are upon it.

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6

Second Law of Newton

an object acceleration is proportional to the net force divided by the mass (a=fnet/m)

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7

Third Law

(the law of force pairs),every force is an interaction between 2 objects so forces come in pairs and will have the same magnitude but different direction.

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8

what is friction caused by?

Microscopic welds created by inter-molecular forces.

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9

why is it important to were your seat-belt?

It is important to wear your seatbelt because in a

collision the car stops but you keep moving

unless there is a force to stop you.

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10

what Galileos law of falling

if air resistance is negligible than any two objects that are dropped together will fall together regardless of there mass, shape, and material.

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11

what is gravity

an attractive force that pull objects closer together as well as a at distance force.

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12

what is terminal velocity

when an object no longer accelerates towards the ground and remains at a constant velocity. The downward and upward forces of gravity will balance each other (the cats jumping out of the building) (only happen if air resistance is lager enough)

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13

what does at distance mean?

the forces are always pulling each other closer together

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14

what is acceleration due to gravity?

the acceleration an object has from the gravitational pull of the earth (g)

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15

what is force of gravity?

the force that acts between 2 objects depending on there mass and distance (G)

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16

what is equilibrium?

all forces being balanced (NO ACCELERATION ALLOWED)

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17

what is the normal force

an equal but opposite force keeping it from accelerating.

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18

what is the coefficient of friction

a value that shows the relation ship between the force of friction and the normal between 2 objects/surfaces

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19

what is friction

the amount of force needed for something to move, The force that resists motion.

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20

why can an AStronaut propel themselves in a direction by throwing an object in the opposite direction? (newtons 3rd law)

Because the astronaut is exerting a force on an object to go in a certain direction and that object is existing that same force on the AStronaut but in the opposite direction.

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21

how can you escape a bull by running in a zigzag line (use inertia)

Since the bull is bigger then you, the bull would have a higher inertia . Because of this it wouldn’t be able to slow down and speed up when needed to turn since it has a higher resistance of change in motion. This slows the bull down overall and allows you to escape

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22

what equation is used when finding gravitational field strength or acceleration due to gravity?

g= Fnet/M or g=Gmr2

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23

what equation is used when finding acceleration?

a= Fnet/m

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24

what equation is used when finding mass

m=Fent/a

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25

what equation is used when finding weight or gravitational force

Fent= ma

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26

what equation is used when finding friction force?

Ff=mewFn

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27

what equation is used when finding normal force?

Fnet = ma

Fg + Fn = ma

(if Fn = Fg, then a = 0, if Fn is greater then Fg, then a = up)

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28

what equation is used when finding coefficient of friction (mew)

mew=ff/fn

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