# High school physics Definition and 17 Discussions

The Journal of High Energy Physics is a peer-reviewed, open access scientific journal covering the field of high energy physics. It is published by Springer Science+Business Media on behalf of the International School for Advanced Studies. The journal is part of the SCOAP3 initiative.

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1. ### Deducing as much as possible from m, a, Ff, and angle (pulling an object horizontally with a handle)

Fg = m * g: Fg = 30 * 9.8 = 294 N Fnet = m * a: Fnet = 30 * 1.2 = 36 N Fax = Fnet + Ff: Fax = 36 + 10 = 46 Fa = Fax / cos(angle): Fa = 46 / cos(25) = 50.75 Fay = Fa * sin(angle): Fay = 50.76 * sin(25) = 21.45 Fn = Fg - Fay: Fn = 294 - 21.45 = 272.55 Ff = mu kinetic * Fn, solving for...
2. ### Is this a possible solution to Verma's Exercise 12, Chapter 5? (A rope and two pulleys lifting a weight)

The correct solution uses angles and trigonometry. My solution is as following: - Suppose the forces exerted by friends 1 and 2 are F1 and F2 respectively. - There are no net force in the x-direction, so F(total x) = 0. - F(total y) = F1 + F2 - mg = 0 (initially). Rearranging gives g =...
3. ### Why momentum of a ball bounced off a wall increases twice fold?

Question 2a: It is really hard for me to get my head around this. The solution of this question mentions the momentum of the ball after it rebounds is 12kgms. My attempt at this solution is as follows Before collision Momentum of ball= mv= 2x3= 6 kgms and momentum of wall= 0 Therefore Total...
4. ### Distance Velocity Graph

Summary: Gradient = Acceleration(?) Area = Time (?) Good evening, I have a problem that presents itself in a distance (y) velocity (x) graph. I've never come across this, and in my Physics textbook, the section dedicated to graphs does not have it. My question is, what does the area of the...

6. ### B Randomness of radioactivity

How can radioactive decay be random if we can calculate aproximately when it will happen . For example we know that an isotope will decay every 2 years by calculating the half life . Doesnt that mean that the decay is systematic rather than random because we can calculate when its guna happen ...
7. ### B Understanding units

I am an student in physics department and I will graduate very soon.In my past four year I have done a good work and get a nice gpa.But as I get more and more familiar with advanced content such as quantum field theory,I become very comfusing about what I learn in my high school. Because I...
8. ### Schools Hey everybody! - I need to pick a major for college applications

Hello y'all! I'm a high school student and I'm looking for some advice:) I am very interested in physics, quantum mechanics in particular. I'm a bit of an overachiever, and I usually overthink everything. I come from a family of doctors, and although they don't pressure me into following in...
9. ### Motion and Forces [High School]

Homework Statement Mariana is volleying with Old Man Miller and returns one of his feeble tennis serves. He serves the ball such that it is moving at a speed of 35km/h [Forward] when she strikes the 0.060kg ball and sends it back over the net at a velocity of 55km/h[Backward]. a) If the ball...
10. ### New member, with Physics Olympiads

I am a new member here and decided to join Physics Forums to get help to prepare for Physics Olympiads. I am a high school sophomore. Going to be a junior soon. I have taken advanced Math classes via MIT OCW and the internet. I am also proficient with Mechanics, but nothing international...
11. ### Schools High School Physics

Would it be a good idea to take both AP Physics C and AP Physics 2 in my senior year of high school (next year for me)? Does anyone have any experience with this and if so what was it like? Would I be biting off more than I can chew or should I go for it?
12. ### Problem graphing Irradiance and distance experiment

Homework Statement Used a solar cell and a ray box, altering the distance from the solar cell to the light source in 10cm increments. Did the usual high school experimental controls and repeats. Assuming that the voltage is proportional to the irradiance, I am meant to graph the results...
13. ### Roller coaster physics conceptual question

Homework Statement For my high school physics class we made roller coasters out of card stock with various loops and funnels. We then had multiple questions to answer. I couldn't seem to figure this one out. Why does the power have to be found at the bottom of the loop? Explain in terms of...
14. ### Angular Velocity and Acceleration

Homework Statement If a bike wheel rotates 9.4 times while slowing down to a stop from an initial angular velocity of 8.1 rad/s, what is the magnitude of the angular acceleration in rad/s/s Homework Equations α = at / r α = ω / t α = Θ / t^2 ω = Θ / t ω = v / r Θ = ω t + 0.5 α t^2 v final = v...
15. ### Angular Velocity and Acceleration

Homework Statement A car is traveling at 27.8 m/s, it undergoes a negative acceleration of 2.6 m/s/s when the brakes are applied. How many revolutions will the tires go through before the car comes to a stop if the wheels each have a radius of 1.0 m? Homework Equations α = at / r...
16. ### Schools Do you need high school physics to study physics?

I tried to keep the thread name as applicable to my question as possible. I'm sure this question has been asked before I apologise in advance I could not find the appropriate answer :) I did not do physics at high school as when I tried to change a sub to physics they told me I was too late...
17. ### American Yr 10 Physics in Australia....assistance needed

Hi All. My name is Simone and i have joined for the purposes of correcting my personal educational inadequacies. I have an inadequacy in my formal education as i only went to Year 8 in Australia. I am struggling to help my daughter at the moment. My 16 year old daughter is stumped on some...