Work, force, & energy
This is defined as a push or pull measured in Newtons.
Force
If a machine is 100% efficient, these two values are equal.
IMA and AMA
Scissors are what class of lever?
First-class
An inclined plane increases what?
Distance of effort
Pulley that changes direction only?
Fixed pulley
This is calculated by multiplying force by distance.
Work
Can any machine be 100% efficient? Why?
No, because friction causes energy loss.
Wheelbarrow is what class of lever?
Second-class
Formula for inclined plane force relationship?
Fe x De = Fr x Dr
Pulley that reduces effort force?
Moveable pulley
15 N moves an object 2 m. How much work is done?
30 J
Input 20 J, Output 11 J. Efficiency?
55%
Tweezers are what class of lever?
Third-class
IMA of inclined plane equals?
Length divided by height
If force decreases in pulley, what increases?
Distance of effort
342 J of work is done over 32 m. What is the force?
10.7 N
Input 75 J, Output 63 J. Efficiency?
84%
What determines lever classification?
Location of fulcrum and forces
If effort force decreases, what increases?
Distance
Mechanical advantage equals?
Number of supporting strands
56 N produces 89 J of work. What is the distance?
1.59 m
If efficiency increases, output force becomes closer to what?
Input force
Fr=40N, Dr=10m, De=15m. Find Fe.
26.7 N
Formula for AMA?
Fr divided by Fe
3 supporting strands equals what IMA?
3