# AP Physics B free response practice questions

• Sudhakar_alla
In summary, two 10-kilogram boxes connected by a massless string are at rest with one hanging vertically and the other 2.0 meters from the bottom of an inclined plane at a 60° angle. The coefficients of kinetic friction and static friction between the left-hand box and the plane are 0.15 and 0.30 respectively. The questions ask for the magnitude of frictional force acting on the box, the amount of mechanical energy converted into thermal energy during the slide, and the kinetic energy of the left-hand box when it reaches the bottom of the plane. To solve these, we can use the equations fk = UkN and N = mg. However, the solution cannot be provided without the attempt at solving
Sudhakar_alla

## Homework Statement

two 10-kilogram boxes are connected by a massless string that passes over a massless frictionless pulley. The boxes remain at rest with the one on the right hanging vertically and the one on the left 2.0 meters from the bottom of an inclined plane that makes an angle of 60° with the horizontal. The coefficents of kinetic friction and static friction between the left-hand bax and the plane are 0.15 and 0.30 respectively.

fk = UkN
N = mg

## The Attempt at a Solution

c) Determine the magnitude of the frictional force acting on the box on the plane. The string is then cut and the left-hand box slides down the inclined plane.

D) determine the amount of mechanical energy that is converted into thermal energy during the slide to the bottom.

E) Determine the kinetice energy of the left hand box when it reaches the bottom of the plane.

If someone could explain how they got the answers it would help a lot. Thanks.

Please show us your attempt solution. Nobody here is going to sit around and explain how to do every question step-by-step unless you've made an honest effort to try the questions yourself.

As a scientist, it is important to have a clear understanding of the concepts and equations being used in a problem, in order to accurately solve it. In this problem, the key concept to understand is the relationship between forces, friction, and energy.

c) To determine the magnitude of the frictional force acting on the box on the plane, we can use the equation for kinetic friction: fk = μkN. In this case, the normal force (N) is equal to the weight of the box, which is mg. Therefore, the frictional force is given by fk = μkmg. Substituting the values given in the problem, we have fk = (0.15)(10 kg)(9.8 m/s^2) = 14.7 N.

d) When the string is cut, the left-hand box will slide down the inclined plane due to the force of gravity. As it slides, some of its mechanical energy will be converted into thermal energy due to friction. We can use the equation for work done by friction, W = μkNΔx, to calculate the amount of mechanical energy converted into thermal energy. In this case, the change in position (Δx) is equal to the length of the inclined plane, which is 2.0 m. Therefore, W = μkmgΔx = (0.15)(10 kg)(9.8 m/s^2)(2.0 m) = 29.4 J.

e) To determine the kinetic energy of the left-hand box when it reaches the bottom of the plane, we can use the equation for kinetic energy, KE = 1/2mv^2. In this case, the mass (m) is 10 kg and the velocity (v) is given by the equation v = √(2gh), where g is the acceleration due to gravity (9.8 m/s^2) and h is the height of the plane (2.0 m). Therefore, v = √(2(9.8 m/s^2)(2.0 m)) = 6.26 m/s. Substituting these values into the equation for kinetic energy, we have KE = 1/2(10 kg)(6.26 m/s)^2 = 196.15 J.

## 1. What topics are typically covered in AP Physics B free response practice questions?

AP Physics B free response practice questions cover a range of topics including kinematics, Newton's laws of motion, work and energy, momentum and collisions, circular motion and gravitation, rotational motion, and simple harmonic motion.

## 2. How many free response questions are typically included in an AP Physics B practice exam?

AP Physics B practice exams usually include 3-4 free response questions. These questions are designed to test your understanding of key concepts and your ability to apply them to real-world problems.

## 3. Are there any resources available to help prepare for AP Physics B free response questions?

Yes, there are many resources available to help you prepare for AP Physics B free response questions. These include practice exams, review books, online tutorials, and study guides. It is also helpful to work through past AP Physics B free response questions to familiarize yourself with the format and types of questions.

## 4. How much time should I spend on each AP Physics B free response question?

It is recommended to spend around 10-12 minutes on each AP Physics B free response question. This will give you enough time to read and understand the question, plan your solution, and show all necessary work.

## 5. How important are AP Physics B free response questions for the overall exam score?

AP Physics B free response questions make up 50% of the overall exam score. This highlights the importance of practicing and mastering these types of questions in order to do well on the exam.

• Introductory Physics Homework Help
Replies
19
Views
3K
• Introductory Physics Homework Help
Replies
1
Views
1K
• Introductory Physics Homework Help
Replies
12
Views
2K
• Introductory Physics Homework Help
Replies
12
Views
1K
• Introductory Physics Homework Help
Replies
4
Views
3K
• Introductory Physics Homework Help
Replies
6
Views
446
• Introductory Physics Homework Help
Replies
2
Views
2K
• Introductory Physics Homework Help
Replies
1
Views
2K
• Introductory Physics Homework Help
Replies
2
Views
13K
• Introductory Physics Homework Help
Replies
5
Views
4K