Alb Mod (formulas) Force and motion Flashcards
To find mechanical advantage with load and effort
MA = L/E
To find mechanical advantage with load distance and effort distance
MA = ED/LD
Work done on one side of a lever is equal to work done on the other side. What formula expresses this?
E x ED = L x LD
What is the measurement of the acceleration of gravity?
9.81 m/s^2
What is a first class lever?
lever with fulcrum in the middle
Fle
123
What is a second class lever?
lever with the load in the middle
fLe
123
What is a third class lever?
Lever with the effort in the middle
flE
123
When working with wheels, what is the effort distance?
radius of the wheel work is applied to
When working with wheels, what is the load distance?
radius of the wheel the load is applied to
To calculate the force applied using a weight and acceleration, you would use the formula:
F = M x A
With an inclined plane, the effort distance is the:
Hypotenuse
With an inclined plane, the load distance is the:
vertical height
With a screw jack, your effort distance is the circumference of the circle your handle makes in a full revolution. What is the formula to find effort distance on a screw jack?
ED = 2 x 3.1416 x r
With a screw jack, your load distance is your:
screw jack thread pitch
The mechanical advantage of a pulley is:
The number of strands supporting the load. May or may not include the effort strand
Finding the effort of a pulley system requires the formula:
E = L/MA
The basic formula for torque is:
Tq = F x D
The formula for finding mechanical advantage with torque values is:
MA = Tq out / Tq in
Idler gears affect the rotation of the output shaft, but not calculations for:
torque, RPM, mechanical advantage
In a compound gear or pulley system, treat it like:
several simple systems
On a worm, the number of teeth are determined by:
Number of starts
What is the formula to find a missing value of RPM/pulley diameter?
RPM x DIA = rpm x dia
What is the formula to find a missing value of RPM/a gear?
RPM x N = rpm x n
What is the formula to find a missing value of RPM/ a worm gear?
RPM x S = RPM x N
What is the formula to find a missing value of RPM/ torque?
RPM x Tq = rpm x tq
What is the formula to find a missing value of mechanical advantage/gears?
MA = N out / n in
same as gear ratio
What is the formula to find a missing value of mechanical advantage/torque?
MA = Tq out / Tq in
What is the formula to find a missing value of mechanical advantage/RPM
MA = rpm in / rpm out
What is the formula to find a missing value of mechanical advantage/pulley diameter?
MA = D out / D in
