# Read about ap physics 1 | 32 Discussions | Page 1

1. ### AP Physics 1 Help? Centripetal motion/Kinematics/Friction problem

I think I have solved the first three, and only really need help on question four. For number one, I used Fc = (Mv^2)/R and just rearranged it for velocity so I ended up with v = sqrt(ac * R) For number 2 I used Ff = Fn*mu and got Mg*mu = Ff For number 3 I used w = Ff*d and got w = -Mg*mu*l...
2. ### Force of the Ladder on a Wall Torque

I've been working on this problem for a couple days now and I'm clearly missing something. I first went ahead and solved the triangle. Hypotenuse is 5, height is 4, the last side is 3 and the angle is 53 degrees. I went ahead and did the sum of forces in the y direction = Fn - Fbucket - Fearth =...
3. ### Not necessarily homework help but I do not understand Field lines

Homework Statement: This is not for homework but I have an AP physics exam on field lines and am confused about the proportionality between the charges of objects and the number of field lines. Homework Equations: E=(k*q)/r^2 I am struggling with the number of field lines to put based on the...
4. ### Courses AP Bio then AP Physics 1 or other way around?

Hey! I’m a sophomore that is scheduling for next year. Hopefully, I will be taking AP Calc BC next year (junior year). As for my science course, I want to take AP Bio and AP Physics 1 before graduating, but we can only take one per year. So would you recommend Physics during my senior year when...
5. ### What is the tension force for this system in rotational equilibrium?

The system is in rotational equilibrium and therefore experiences no net torque, meaning all individual torques must add to zero. τNET = 0 = FFTsin(θ)L - FgL - Fg(L/2) τNET = 0 = FTsin30°(0.6???) - (0.5)(9.8)(0.6) - (2.0)(0.6/2) My only problem (I think) is figuring out what the length L is...
6. ### The force between links

Homework Statement In the figure below, a chain consisting of five links, each of mass 0.103 kg, is lifted vertically with a constant acceleration of magnitude a = 2.49 m/s2. (a) Find the magnitude of the force acting between link 1 and link 2. (b) Find the magnitude of the force acting...
7. ### IDENTICAL TRUCK COLLISIONS

Homework Statement Two identical trucks traveling at different constant speeds are about to collide. The trucks are traveling in opposite directions with truck A going at a velocity of 3m/s right and truck B going at 4m/s left. During the collision, will the magnitude of the acceleration of...
8. ### Finding friction and tension for a train

Homework Statement A UTA Trax train engine can apply 96050 Newtons and locomotive has a mass of 1750 kg. The passenger car has a mass of 949 kg. (A) If the train accelerates at a rate of 1.29 m/s/s, how much friction is present in the passenger car? (Assume the locomotive moves...
9. ### Which forces am I missing in the FBDs?

Homework Statement Two blocks with pulleys attached lie on a frictionless surface and are connected by a massless rope strung over the pulleys as shown at right. A force of magnitude F is applied to the second block. Draw a FBD for a system consisting of Block 1 and its pulley, and also a...
10. ### Evidence that the ship had its engine turned on

Homework Statement Homework Equations a = v/t p=mv(?) The Attempt at a Solution If an engine is turned on, that means that the ships are accelerating since the engine pushes back on air with a force and air pushes back to propel the ships forward, so I thought (A) would be the answer, even...
11. ### What force propels the runner forward?

Homework Statement A person is running on a track. Which of the following forces propels the runner forward? a) The normal force exerted by the ground on the person b) the normal force exerted by the person on the ground c) the force of friction exerted by the ground on the person 2. Homework...
12. ### Mechanical energy for planet in elliptical orbit around star

Homework Statement A planet is in an elliptical orbit around a star. Which of the following best represents the mechanical energy E_planet of just the planet and the mechanical energy Es_tar-planet of the star-planet system as functions of time for one complete orbit? Homework Equations...
13. ### Which sphere reaches the bottom of the inclined plane first

Homework Statement Two spheres are placed side by side on an inclined plane and released at the same time. Both spheres roll down the inclined plane without slipping. (a) Using FBD, explain what force provides the torque allowing the sphere to roll down the inclined plane. (b) Which sphere...
14. ### Drawing electric field lines

Homework Statement In the diagram, two small objects, each with a charge of -4.0nC, are held together by a 0.020 m length of insulating string. The objects are initially at rest on a horizontal, non conducting frictionless table & the effects of gravity on each other are negligible. (b)...
15. ### Motion of point when sound volume goes up

Homework Statement A radio speaker produces sound when a membrane called a diaphragm vibrates, as shown above. A person turns up the volume on the radio. Which of the following aspects of the motion of a point on the diaphragm must increase? a) the max. displacement only b) the average...
16. ### Force problem with three masses and two pulleys

Homework Statement For the apparatus in the figure, what is the minimum value of the coefficient of static friction between the block (m3) and the table that would keep the system at rest if m1 = 0.10 kg, m2 = 0.20 kg, and m3 = 0.30 kg? (Assume ideal conditions for the string and pulleys.)...
17. L

### Acceleration, Displacement, Graph Interpretation

Hello, I was working on a worksheet. It gave a graph that was velocity vs. time. I was asked to find the acceleration rate for the given (specific) time in seconds. My first question is if the line on the graph for example is from 1-3 seconds, in that 1-3 second range, is acceleration constant...
18. E

### Courses AP Physics 2 without AP Physics 1?

Hey, all! My situation is as follows: I'm an upcoming senior in high school and in the middle of my junior year I developed an interest in physics. However, at my school, AP Physics 1 is taken junior year and AP Physics 2 is taken senior year. I didn't take AP 1 because I was indifferent to...
19. ### Circular Motion: Ball on String

Homework Statement A 1.5 kg ball is tied to a string that is .75 m long and whirled in a verticle circle. A) Find the tension in the string at the top of the circle B) Find the tension in the string at the bottom of the circle Homework Equations Fc=mac ac= v2/r The Attempt at a Solution A)...
20. ### Finding internal resistance & EMF of a battery in a circuit

Homework Statement When an external resistor of resistance R 1 = 14 Ω is connected to the terminals of a battery, a current of 6.0 A flows through the resistor. When an external resistor of resistance R2 = 64.4 Ω is connected instead, the current is 2.0 A. Calculate the emf and the internal...
21. ### AP Physics Question on Conservation of Energy

1. Homework Statement A toy car coasts along he curved track shown above. The car has initial speed vA when it is at point A at the top of the track, and the car leaves the track at point B with speed vB at an angle ϴ above the horizontal. Assume that the energy losses due to friction is...
22. ### Rotational motion down an incline (ring/hoop)

Homework Statement A 24kg metal ring with 24cm diameter rolls without slipping down a 30 degree incline from a height of 3.4 m. 1) According to the law of conservation of energy what should be the linear speed of the ring at the bottom of the ramp 2) if the ring has a moment of inertia of...
23. ### Work and energy

Homework Statement This is for my ap physics summer work and is giving me some trouble and could use any help A small block, with a mass of 250 g, starts from restart the top of the apparatus shown above. It then slides without friction down the incline, around the loop then onto the final...
24. ### Physics in everyday life

Hi there! So to wrap up the year in AP Physics 1, we have to take videos or pictures of physics in everyday life. Two of my situations are: 1. Situation where you have greatest net torque 2. Situation where acceleration changes both speed and direction at same time For the first one, I was...
25. ### I really need help with my course selection for next year!

Hi guys, I really need help with deciding my courses for next year. Currently, i'm a sophomore in high school rising to a junior next year, and today, we began doing course selections for next year. Now, before I continue, I didn't just start thinking about my courses for next year today. I've...
26. ### Confusion about how to identify lever arm

Homework Statement A rotational axis is directed perpendicular to the plane of a square and is located as shown in the drawing. Two forces, F1 and F2, are applied to diagonally opposite corners, and act along the sides of the square, first as shown in part a and then as shown in part b of the...
27. ### Confusion about type and quantity of force being exerted

Homework Statement A 500-N person stands 2.5 m from a wall against which a horizontal beam is attached. The beam is 6 m long and weighs 200 N (see diagram below). A cable attached to the free end of the beam makes an angle of 45 degrees to the horizontal and is attached to the wall. a) draw a...
28. ### Uniform Circular Motion and Centripetal acceleration

Homework Statement For a scene in a movie, a stunt driver drives a 1.20✕ 103 kg pickup truck with a length of 4.65 m around a circular curve with a radius of curvature of 0.333 km (Fig. 7.29). The truck is to curve off the road, jump across a gully 10.0 m wide, and land on the other side 2.96 m...
29. ### Force with friction problem(determine a force by the angle)

Homework Statement A block of mass m rests on a horizontal table. The block is pulled by a massless rope with a force F at an angle θ. The coefficient of static friction is 0.60. The minimum value of the force needed to move the block depends on the angle θ a)Discuss qualitatively how you would...
30. ### New to AP teaching - AP Physics 1 test help

I have never taught an AP class, and this year is my first year where my students will be taking the AP Physics 1 test. I took a look at the sample questions they have released and it got me scared and nervous. What are you doing to prepare your students for the AP test? Anything different...