AP Physics C Electricity & Magnetism - Friction

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?

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?

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

$\begin{align*}&\text{A block of mass }19kg\text{ rests on an incline of }69^{\circ}\&\text{What is the frictional force acting on the block from the surface?}\&g=9.81\frac{m}{s^2}\end{align*}$

$\begin{align*}&\text{A block of mass }208kg\text{ rests on an incline of }28^{\circ}\&\text{What is the frictional force acting on the block from the surface?}\&g=9.81\frac{m}{s^2}\end{align*}$

$\begin{align*}&\text{A block of mass }284kg\text{ rests on an incline of }48^{\circ}\&\text{It is also partially supported by a rope.}\&\text{The frictional force acting on the block is }207.04N\&\text{What is the tension felt in the rope?}\&g=9.81\frac{m}{s^2}\end{align*}$

A $\small 15kg$ crate is pulled across a horizontal floor at a constant velocity of $\small 3\frac{m}{s}$ . The coefficient of kinetic friction between the crate and the floor is $\small 0.20$ . If the rope pulling the crate is angled at $\small 45^o$ above the horizontal, what force must be applied to maintain this constant velocity?

A force of 40N is applied on a 14kg box to move it to the right. If the coefficient of friction between the box and the floor is 0.2, what is the acceleration of the box?

$\begin{align*}&\text{A block of mass }51kg\text{ rests on an incline of }11^{\circ}\&\text{What is the frictional force acting on the block from the surface?}\&g=9.81\frac{m}{s^2}\end{align*}$

A truck driver is making a delivery. He takes a 287kg box out of his semi-truck by having it slide down a 33o ramp that is 5.5m long. To ensure that the box doesn't accelerate down the ramp, the driver pushes back on it so that the box's constant speed is $1.7\frac{m}{s}$ . If the coefficient of friction is 0.4, calculate the work done by the frictional force.

Friction

Practice Questions