Energy
energy stored in the bonds between objects/elements
potential chemical
if force and motion are ___, work is equal to the force multiplied by distance
parallel
Acceleration is in the same direction as the net force is equal to force divided by mass
2nd law
When two or more forces act on an object at the same time
Net force
A boy weighs 400N what is his mass
41kg
energy from food is measured in
calories
Ration of output force to input force
mechanical advantage
for an action there is an equal/opposite reaction
3rd law
When the net forces on an object cause the object to move they are
unbalanced
What is the net force on a dragster with a mass of 900kg if its acceleration is 32m/s2
28,800N
rate at which energy is converted
power
Name the two simple machines that make up a shovel
wedge and lever
Air resistance depends on three things, what are they
size, shape, speed
opposes motion of two surfaces sliding past each other
sliding friction
how much work do you do when you lift a 100N child 0.5m
50J
Gravitational potential energy depends on two things what are they
mass and position/height
Ratio of output work to input work
efficiency
maximum speed an object will reach when falling
terminal velocity
equal but opposite forces that cause the object to stay stationary
balanced forces
find the efficiency of a machine that does 800J of work if the input work is 2,000J
40%
sum of kinetic and potential energy of a system
mechanical energy
does work with only one movement
simple machine
If the force is large and the mass is small what kind of acceleration do you get
large acceleration
gravitational forces depend on what two things
mass and distance
if a runner's power is 400W as she runs, how much chemical energy does she convert into other forms in 10min
240,000J