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AP Physics C: Mechanics : Friction

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Example Questions

Example Question #15 : Friction And Normal Force

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

Possible Answers:

627.43N

63.96N

1834.47N

1723.84N

Correct answer:

1723.84N

Explanation:

Normal

$\begin{align*}&\text{To solve a problem of force balance, a good idea is to draw}\\&\text{it out. Since the block is at rest, i.e. stationary, the sum}\\&\text{of forces acting on it must be equal to zero. The forces acting}\\&\text{on it are gravity (in the form of the mass times the gravitational}\\&\text{constant), a normal force, and since it’s on an incline, a frictional}\\&\text{force to balance it all out:}\\&F_{mass}=m*g\\&F_{normal}=m*g*cos(a)\\&F_{friction}=m*g*sin(a)\\&F_{friction}=187kg(9.81\frac{m}{s^2})(sin(70^{\circ}))\\&F_{friction}=1723.84N\end{align*}$

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Example Question #94 : Ap Physics C

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

Possible Answers:

957.95N

1801.64N

183.65N

2040.48N

Correct answer:

957.95N

Explanation:

Normal

$\begin{align*}&\text{To solve a problem of force balance, a good idea is to draw}\\&\text{it out. Since the block is at rest, i.e. stationary, the sum}\\&\text{of forces acting on it must be equal to zero. The forces acting}\\&\text{on it are gravity (in the form of the mass times the gravitational}\\&\text{constant), a normal force, and since it’s on an incline, a frictional}\\&\text{force to balance it all out:}\\&F_{mass}=m*g\\&F_{normal}=m*g*cos(a)\\&F_{friction}=m*g*sin(a)\\&F_{friction}=208kg(9.81\frac{m}{s^2})(sin(28^{\circ}))\\&F_{friction}=957.95N\end{align*}$

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AP Physics C: Mechanics : Friction

Study concepts, example questions & explanations for AP Physics C: Mechanics

All AP Physics C: Mechanics Resources

Example Questions

Example Question #15 : Friction And Normal Force

Example Question #94 : Ap Physics C

All AP Physics C: Mechanics Resources

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