4A: Kinematics and Force

Question 1

simple machine where work must be conserved

Answer 1

pulley (work= force x distance)

Question 2

equation for torque

Answer 2

τ=F⋅dsin(θ)

Question 3

Equation for mechanical advantage using a ramp

Answer 3

MA= hypotenuse/height

Question 4

If velocity is constant, what happens to force and acceleration?

Answer 4

force and acceleration is 0

Question 5

If force is constant, what happens to acceleration and velocity?

Answer 5

acceleration is constant and velocity is linear

Question 6

Newton’s 1st law of motion (law of inertia)

Answer 6

object at rest remains at rest and objects in motion remain in motion unless acted upon by another force

Question 7

Newton’s 2nd law of motion

Answer 7

F=ma

Question 8

Newton’s 3rd law of motion

Answer 8

for every action there is an equal and opposite reaction

Question 9

projectile equations

Answer 9

t=(2v)/g
v=sqrt(2gh)
x=1/2g(t^2)

Question 10

equation for torque

Answer 10

Frsin(theta); Fd

-measures force ability for rotational acceleration

Question 11

units of energy

Answer 11

1 J= 1 Nm= 1 kg (m2^2)/(s^2)

Question 12

Archimedes Principle:

• floating object
• submerged object

Answer 12

• floating: displace weight (mass)

- submerged: displace volume (density)

Question 13

centripetal force

Answer 13

Fc=(mv^2)/r

Question 14

Which functions are state dependent?

Answer 14

work and heat

Question 15

1st law of thermodynamics

Answer 15

U=Q-W

Internal energy= heat-work