Kinematics

Question 1

1 eV in Joules

Answer 1

1.6 x 10^-19 J

Question 2

dot product A • B

Answer 2

|A||B| cosθ

scalars

Question 3

cross product A x B

Answer 3

|A||B| sinθ

vector

Question 4

gravity

Answer 4

Fg = Gm1m2/(r^2)

Question 5

G

Answer 5

6.67 x 10^-11 (N•m^2)/(kg^2)

Question 6

what kind of friction do tires experience?

Answer 6

static bc it’s not sliding each part of the tire is experience instantaneous friction

Question 7

center of mass of gravity

Answer 7

x = (m1x1 + … + mnxn)/(m1 + … + mn)

Question 8

kinematic equations

Answer 8

v = v0 + at
x = v0t + a(t^2)/2
v^2 = v0^2 + 2ax

Question 9

uniform circular motion

Answer 9

• instantaneous velocity vector is always tangent to the circular path
• centripetal force keeps everything inwards
• tangential force is 0 bc no change in speed

Question 10

centripetal force

Answer 10

Fc = (mv^2)/r

• centripetal force generates a centripetal acceleration
• can be caused by tension, gravity, electrostatic forces, or other forces

Question 11

rotational eq

Answer 11

• rotation around a fulcrum
• application of force at some distance from the fulcrum generates torque
• torque generates the rotational motion and eq happens when vector sum of all torque forces are zero

Question 12

torque formula

Answer 12

τ = r x F = rFsinθ