forces

Weight

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

Mass

The amount of matter in the object. (kg)

Inertia

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

Force (propbly not on test)

A push or pull on an object.

newtons First Law

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

Second Law of Newton

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

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.

what is friction caused by?

Microscopic welds created by inter-molecular forces.

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.

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.

what is gravity

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

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)

what does at distance mean?

the forces are always pulling each other closer together

what is acceleration due to gravity?

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

what is force of gravity?

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

what is equilibrium?

all forces being balanced (NO ACCELERATION ALLOWED)

what is the normal force

an equal but opposite force keeping it from accelerating.

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

what is friction

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

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.

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

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

g= Fnet/M or g=Gmr²

what equation is used when finding acceleration?

a= Fnet/m

what equation is used when finding mass

m=Fent/a

what equation is used when finding weight or gravitational force

Fent= ma

what equation is used when finding friction force?

Ff=mewFn

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)

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

mew=ff/fn