Exam 2 Review

Equations for Calculating Forces

100

Force due to Gravity (Weight)

F_g=mg

200

Kinetic Friction

f_K=u_kF_N

300

Static Friction

f_s<u_sF_N

400

Newton's First Equation

@ constant velocity:

F_tot=0

Trig

100

Pythagorean Theorem

a²+b²=c²

200

sin(0)=?

cos(90)=?

0

300

What is the equation for:

sin()=?

cos()=?

tan()=?

opposite/hypotenuse

adjacent/hypotenuse

opposite/adjacent

400

sin()/cos()=?

tan()

Vectors

100

Can we add an x-component of a force to a y-component of a different force?

no

200

F_2x=?

120cos(60^o)=60 N

300

F_1y=?

80sin(18^o)=24.7 N

400

F₁+F₂=?

129.6 N

Math

100

x²+2=6

x=2

200

5x+2x-7=0

x=1

300

4x²-16x+16=0

x=2

400

x²/25=4x

x=100

Displacement/Motion

100

What is the displacement if something moves 2 meters East?

2 meters

200

John leaves his house at 8 AM and travels 4 miles to school. He returns home at 3 PM. What is his displacement from 7 AM to 5 PM?

0 miles

300

Equation for average velocity

v_avg=displacement/time

400

How many meters in 1 mile

1 mile = 1609 meters