I know my Forces
the gravitational force exerted on an object near the surface of the earth or any celestial body
the velocity at which a falling object will stop speeding up
What is terminal velocity?
the resistance arising to an object's motion through a fluid or across a surface
What is friction?
the transfer of energy from one subject to another by a force
What is work?
the unit of power
On Earth, we perceive the gravitational force exerted on an object as its ___________.
What is weight?
an object that hangs from a fixed point and swings back and forth because of gravity
What is a pendulum?
affects sliding objects already in motion
What is kinetic friction?
Equation to calculate work
What is W = Fd ?
or work = force x distance
equals the product of the object's mass and velocity
What is momentum?
states that any two objects attract each other through gravitational force OR states F = G*(m1m2) / r2
What is law of universal gravitation?
the force a string exerts on an object causing it to travel in a curved path rather than in a straight line
What is centripetal force?
affects stationary objects, preventing them from moving at all
What is static friction?
SI unit of work
What is a joule?
device for doing work
What is a machine?
the first to demonstrate that acceleration caused by earth's gravity is INDEPENDENT of an object's mass
Who is Galileo?
Equation to calculate distance of a fall
What is d = (1/2)(g)(t2)
distance = (1/2)(acceleration of gravity)(time2)
the effect of the surfaces is expressed using unit-less values called _________ __ ___________,
expressed as Greek symbol mu
What is coefficients of friction?
the rate of doing work
What is power?
a measure for how much help a machine provides
What is mechanical advantage?
'constant' rate of acceleration of an object during free-fall
What is 9.81 m/s2?
Equation of find Weight of an object
What is Fw = mg?
Or weight = mass x acceleration of gravity
Equation to calculate kinetic friction force
What is Fkf = (mu)kf x Fw ?
or kinetic friction force = coefficient of kinetic friction x weight
Equation for power
What is P = W/t ?
or power = work / time
Simple machines provide three main forms of assistance, what are they?
What is
1. they can multiply applied force
2. they can multiply the distance the applied force moves something
3. they can change the direction of the force ?