Motion and forces
What is acceleration?
The rate at which velocity changes over time
What is force?
2 factors that affect gravity are
what is the formula for work
w=fd
The fixed point of a lever is called
fulcrum
What is the formula for speed?
s=d/t
Define friction
A force that resists motion
how could you decrease friction on a surface?
make it smoother
what is the unit for work
joules
a nail is a type of
wedge
a measure of how fast something moves
define gravity
the force that objects exert on eachother
how could you increase friction on a surface?
make it rougher
what is the formula for power?
p=w/t
a machine with 100% efficiency has no
friction
What is a unit of speed?
m/s
A ball is hit with 100N of force. What is the reaction force?
100N
the same rate
what is the unit for power?
watts
what is the way to remember the lever classes
fle 123
If something is moving it must be compared to this type of point.
Reference
unbalanced force
what is an example of rolling friction?
wheels on a car
work is done when
a force is exerted on an object and the object moves in the direction of that force.
what class is a lever with the fulcrum in the middle
1st class