Chapter 2 (B - 2.6 to 2.14) - Forces, Momentum, etc Flashcards
Force
pull or push exerted by one object on another
Newton’s first law of motion
A stationary object will remain stationary if no external force acts upon it, an object in motion will keep moving at a steady speed in a straight line, without any interference by any other external forces.
Balanced forces
Forces that are in balance cancel each other out
Terminal velocity
When the air resistance is equal to the weight of the object, and the forces are balanced, it reaches it max speed, which is its terminal velocity
Resultant force
The force that is equivalent too two unbalanced forces.
force formula
F = ma
1 Newton:
The force required to give a mass of 1 kg am acceleration of 1m/s
Friction
Force that stops materials from sliding over each other.
Static friction
The friction that stops a stationary body from moving.
Dynamic friction
The friction that is created between moving objects.
Drag
Dynamic friction objects experience as they move through a fluid.
Weight formula
weight = m*g
Newton’s third law of motion
every action has an equal and opposite reaction.
Momentum formula
mv
momentum (resultant force formula)
force = change in momentum/change in time
impulse
force * time
its the change in momentum
eq for final velocity when initial v, acceleration and time are given
final = initial + accelerationxtime
eq for final velocity when initial v, acceleration, and displacement are given
final^2 = initial^2 + 2 x acceleration x displacement
v^2 = u^2 + 2as
eq for displacement when initial v, time and acce is given
displacement = initial velocity x time + 1/2 acceleration x time^2
s = ut + 1/2 at^2
eq for displacement when final v, time and acce is given
displacement = final velocity x time - 1/2 acceleration x time^2
s = vt - 1/2 at^2
eq for displacement when final v, initial v and time is given
displacement = half (initial + final) x time
s = 1/2 x (u + v) x t
Direction of centripetal force
towards the center
what provides centripetal force
friction between the track (thing the obj is rotating on) and the object
eg in a roudn race track
friction between tires and tires
Why would an object going flying from a circular motion
eg why would a car go off the track after it speeds up
friction provided for centri petal force is too less for the car and therefore it goes of the track in a tangential manner
