AP Physics C Electricity & Magnetism - Friction and Normal Force

A $\small 3500kg$ truck traveling at $\smlal 25\frac{m}{s}$ suddenly brakes and skids to a halt. If the coefficient of kinetic friction between the tires and the road is $\small 0.4$ , how far does the truck skid before stopping?

$\begin{align*}&\text{A block of mass }233kg\text{ rests on an incline of }81^{\circ}\&\text{What is the normal force acting on the block from the surface?}\&g=9.81\frac{m}{s^2}\end{align*}$

$\begin{align*}&\text{A block of mass }112kg\text{ rests on an incline of }18^{\circ}\&\text{It is also partially supported by a rope.}\&\text{The normal force acting on the block is }417.98N\&\text{What is the tension felt in the rope?}\&g=9.81\frac{m}{s^2}\end{align*}$

A string connected to a box sitting on the floor is used to apply a
force on the box as shown. The string is inclined at an angle of 30°
above the horizontal, the box has a mass of 15 kg, and the tension
in the string is 40 N. The box is at rest, but on the verge of slipping.
What is the coefficient of static friction between the box and the
floor?

$\begin{align*}&\text{A block of mass }187kg\text{ rests on an incline of }70^{\circ}\&\text{What is the frictional force acting on the block from the surface?}\&g=9.81\frac{m}{s^2}\end{align*}$

Friction and Normal Force

Practice Questions