Law & Forces
What is Force?
a push or pull acted upon an object
what are examples of work?
pushing, lifting, dropping, falling, and throwing
the amount of matter in an object
mass
Mass increases = momentum ___
Velocity increases = momentum ___
increases
according to newton's first law, if an object is in motion or at rest it will….
remain at rest or in motion unless an unbalanced force acts upon it
define power
the rate at which work is done
The moon and other satellites rotate around the earth, what force keeps the satellites in orbit?
gravity
by creating the greatest force possible for as long as possible
“every action has an…”
“equal opposite reaction”
energy cannot be...
created nor destroyed
If two large objects with different masses move toward each other under the influence of gravitation, which force is greater?
the force on both is the same
What is momentum and the equation?
the idea of inertia in motion and p=mv or Momentum= mass x velocity
name one of the equations from newton’s 2nd law?
F=ma or Fw=mg
name all units for work, power, and energy
joules(J) & watts(W)
If earth’s mass was increased, with no change in radius, your weight would?
Increases because gravitational force increases
What is the change in momentum of a 750 kg racecar slowed from 32 m/s to 15 m/s?
p = -12,750 kg*m/s
for the same force applied, TWICE as much mass will result in ________ as much acceleration
HALF
name all equations from either work, power, or energy
w=fd P=w/t mgh=1/2mv^2 or PE=KE
Suppose the gravitational force between two spheres is 60 N. If the magnitude of each mass doubles, what is the force between the masses?
240 N
What is the Impulse-Momentum Theory
Impulse is equal to the change in momentum
or
force x time interval = change in momentum