Electricity
Forces/Vectors
Materials
Mechanics
Math skills
100
Formula to find total resistance in a parallel circuit
1/R_t=1/R_1+1/R_2+...1/R_n
100
Newtons second law of motion
F=mxxa
100
What are some properties that are considered when choosing a material
Physical, Thermal, Electrical, Magnetic, Mechanical, Chemical, Cost
100
State the formula for mechanical advantage and find the mechanical advantage for:
MA=L/E
100
What math formula would help find Ra and Rb
Sine rule:
a/sinA=b/sinB
200
What is the Voltage in Resistor 3
9V
200
What is a vector
magnitude and direction (eg: force)
200
What is the difference between elastic and plastic deformation
elastic deformation: object returns to original shape when force is removed
Plastic deformation: object is permanently deformed even after force is removed
200
State the formula for velocity ratio and find the velocity ratio for:
V_r=d_e/d_l
V_r=1.2
200
Which math fromulas would help find Fy and Fx
Trig
Sin23=F_y/18
Cos23=F_x/18
300
Find the Current in Resistor 1
I=2A
300
Working is shown to find the resultant vector, what is the name of the method used and what is the resultant vector
R=1050N -84^\circ
300
What materials are present at 0.5% carbon and 650 degrees.
pearlite connected with alpha ferrite.
300
State the formula for efficiency and find the efficiency for:
efficiency=(MA)/V_r
Eff=4 or 400%
400
How does a Electric generator work
wire coil is rotated inside a magnetic field from some kind of Mechanical input
This causes magnetic induction which is then transffered out of the system as electricity
400
Tensions in two cables need to be found, what steps and strategies are being used to solve the problem.
Draw a free body diagram
Move forces to form a triangle
sine rule to find F1 and F2
400
What material properties of steel would expect with the following carbon percentage and why
harder and more brittle as pearlite is connected with cementite.
500
Complete the logic table
500
Explain the steps taken in the following working out to find the unknown force F
Draw FBD
Find Downward force 3.3N using Trig (sin)
Sum of Moments equal zero with clockwise moments being negative
M=Fd
Solve equation to get F=12.4N
500
What is the carbon % range used to make most steel
0.08%->2% Carbon
500
What is the simple machine and state the velocity ratio
V_r=(output teeth)/(input teeth)
V_r=1/4