For example, if the engine of a car is working at a constant rate of 10kW, the forward force generated is power/velocity = 10 000 / v, where v is the velocity of the car (the 10 was changed to 10 000 so that we are using the standard unit of W rather than kW). Maths Made Easy is here to help you prepare effectively for your A Level maths exams. GCSE Physics (Single Science) Higher Physics. $$s=\frac{u+v}{2}t$$ P is moving around the blue circle with angular velocity w. Suppose we have a conical pendulum as above, where the particle has a mass of 2 kg, the radius of the circle the particle moves in is 0.5 m and the angle at A is 45 degrees. Concise resources for the A Level OCR Physics course. Largest online Education web site in Sri Lanka provides Past papers, Model papers, School papers, Campus papers, Marking schemes, Notes, Career guide for school leavers and lot more Articles.We're mainly focused for G.C.E. Get instant access for a simple one-off payment of just 29.99. We can solve this differential equation to deduce that: where v is the velocity of the particle, a is the amplitude and x is the distance from O. Last document update: 2 year ago Preview 2 out of 9 pages What is the acceleration of the car when its speed is 5m/s? A couple is a system of forces which has a net moment but does not have a resultant force in any one direction. The integral is with respect to x, so we must replace the y by a function of x. 4.866666666666668 1215 reviews. $$v^{2}=u^{2}+2as$$, $$F=\frac{\Delta \left (mv\right )}{\Delta t}$$, $$\small efficiency=\frac{useful\: output\: power}{input\:power}$$, force perpendicular distance from the point to the line of action of the force, force perpendicular distance between the lines of action of the forces, rate of doing work = rate of energy transfer, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Join now 1. $$\large \bar{M}=mg\left ( \frac{l}{2} \right )$$, $$\large F=\frac{\bar{M}}{l}=T\cos\theta$$, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. This could also have been worked out from a diagram: Resolving a vector means finding its magnitude in a particular direction. The first thing to get your head around is all the SI units and their prefixes and . Alternatively, it can be measured in revolutions per second, which is how many complete circles the object moves through in a second. A2 Physics Revision Note. Momentum is measured in N s. Note that momentum is a vector quantity, in other words the direction is important. Imagine that you are trying to push a book along a table with your finger. The tension in the string on both sides of the pulley will also be the same. Using our formula above, this can also be written as: Which of these you use will depend on whether you are dealing with speed or angular speed. Mr Toogood's Physics Mechanics Mechanics is the study of forces, energy and motion. International; Resources; Jobs; Schools directory; News; Courses; Store; Chat . As the particle moves away from the fixed point O, since the acceleration is pointing towards O, the particle will slow down and eventually stop (at Q), before returning to O. Since the vectors are given in i, j form, we can easily calculate the resultant. In other words, the work done is equal to the change in energy. Say goodbye to ads. I hope you find them useful. This frictional force, F, will act parallel to the surfaces in contact and in a direction to oppose the motion that is taking/ trying to take place. Foundations of Physics 2.1 Physical Quantities & Units 2.2 Measurements & Uncertainties 2.3 Scalars & Vectors I. "Force and motion" is a power point for the 9th grade Physics students at the. If a body is resting on a rough slope, it will be on the verge of toppling over when the weight of the body acts through the edge of the part of the body which is in contact with the slope. MECHANICS LIGHT The angular speed is how fast the angle (which I have labelled a) changes. Cambridge International AS and A Level Physics is ideal for learners who want to study physics or a wide variety of related subjects at university or to follow a career in science. National Incubation Center, Street 6, Sector H-9/1, Islamabad Capital Territory 44000 +92 336 7801123; megalecture@gmail.com In other words, it is a flat object whose thickness is we can ignore. Various branches include Classical, Quantum and Statistical mechanics,Find out more fun ways to learn about Mechanics and its branches @Byju's The moment of a force is given by. Slope not steep enough for toppling to occur: This is because, about the edge of the object, there is a net anti-clockwise moment (turning effect). Newtons First Law of Motion states that a body will remain at rest or will continue to move at a constant velocity, unless an external force is applied. In real life, however, this wouldnt be the case. Suppose a force F acts on a body, causing it to move in a particular direction. 9702_iECRs_ALL : Download. This page contains AQA A-Level Physics notes for the students as well as teachers to help them prepare for their upcoming exams.These notes have been specially tailored according to the specifications. Now find the equation of motion in the direction PO (F=ma): document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. mass, time, etc. - Materials isn't too much trouble. Join now. Thus, mass is an invariant quantity; it is measured in units of kilograms. Last updated . where w is a constant (note that this just says that the acceleration of the particle is proportional to the distance from O). In the above example, the moment is clockwise (because the force would cause a body to move in a clockwise direction relative to A). In addition to the written exams, there is also a practical assessment component to the Edexcel A-Level Physics course. When an elastic string is extended it has elastic potential energy. Get Physics AS and A Level Notes here at my new website. AS Level: Topic 1: Working as a Physicist Topic 2: Mechanics Topic 3: Electric Circuits Topic 4: Materials Topic 5: Waves and the Particle Nature of Light A2 Level: Topic 6: Further Mechanics Topic 7: Electric and . 140. The suvat equations can be adapted to solve problems involving projectiles. This is equal to mgs joules, where s is the vertical distance moved by the body, m is the mass of the body and g is the acceleration due to gravity. Applying this equation vertically, when the particle hits the ground: The following documents are a complete set of revision notes that cover Chapters 1-6 of the Physics AQA Spec. So it measures how fast the object is moving round the circle. The reason for this is that the sandpaper exerts more frictional resistance. = 55.231, Therefore the horizontal distance travelled is 55.2m (3sf). Such forces acting on a body might cause the body to rotate, but not move in any one direction. Mechanics - Work, Energy and Power 3. It is considered a vector quantity as it has both direction and magnitude. We have the following scenario (a ball of mass 3kg is moving to the right with velocity 3m/s and a ball of mass 1kg is moving to the left with velocity 2m/s): Suppose we are told that after the collision, the ball of mass 1kg moves away with velocity 2m/s, then we can use the principle of conservation of momentum to determine the velocity of the other ball after the collision. Company Registration Number: 8600593 Final K.E. Hence: Remember, there is no acceleration horizontally so a = 0 here. If a string has been stretched, then the extension is how much longer the string is as a result of being stretched. Elastic strings are strings which are not a fixed length (they can be stretched). KS3 . Initial P.E. If you continue to push harder, eventually a point is reached when the frictional force increases no more. If the body moves a distance of s metres along the ground, then the work done is F cosa s (since F cosa is the component of the force in the direction of motion). Edexcel AS Physics Unit 1 Complete Review. R = 25Tcos30 This includes Further Mechanics, Thermal Physics, Gravitational and Electric Fields, Capacitors, Magnetic Fields, and Nuclear Physics. The amplitude of the motion is the distance from O to either P or Q (the distances are the same). If a particle is projected at fixed speed, it will travel the furthest horizontal distance if it is projected at an angle of 45 to the horizontal. By thinking about similar triangles, we can deduce that y/r = x/r, so y = x. Also, instead of splitting the object into strips, split it into discs, each of thickness dx, radius y and distance x from the y-axis. The direction of this acceleration is towards the centre of the circle and the magnitude is given by: where v is the speed and r is the radius of the circle. The mass of each strip is its volume density. If the particle is on the end of a rod, if the speed reaches zero the particle will stop and fall back along from where it came. This digital download will give you access to all of my A Level Physics notes for the exam board Edexcel. Mass is the measure of the amount of matter in an object. All Notes; Maths; Mechanics 1 b) How far will the cannon ball travel before hitting the ground? The period of the motion is the time it takes for the particle to perform one complete cycle. PHY 105 at Princeton University (Princeton) in Princeton, New Jersey. A2 Physics Unit 6 Revision Guide. This must mean that the frictional force is equal to the force with which you are pushing the book. If you apply a very small force, the book will not move. If a spring is compressed, then Hookes Law still applies but T represents the thrust rather than the tension (basically the only difference is that thrust acts in the opposite direction to tension). In any direction, the resultant force is zero but the moment about A is clearly not zero. The kinetic energy (K.E.) Please note that the Scheme of Assessment has changed since 2005. Year 12 Content (AS Level) 1. Find the angular speed of P. The weight is 2g (W= mg), where g is the acceleration due to gravity. In this case we may already know the weight of the bar. Age range: 16+ Resource type: Other. The equation of motion horizontally (from Newtons Second Law): The centre of mass (/gravity) of a body or a system of particles is the resultant of the weights of the individual particles making up the body or system. Moments occur when forces cause objects to rotate about some pivot. Conservation Of Energy = 25 2.55 0.866 Revision for AQA Physics AS and A-Level, including summary notes, worksheets and past exam questions for each section and paper. Advanced Level (A/L) Provincial Test Papers and Marking Schemes, G.C.E. 3i + j 5i + j = -2i + 2j. The moment of a force about a point measures the turning effect of the force about that point. How far the particle travels will depend on the speed of projection and the angle of projection. To find the centre of mass of such a body, use the technique similar to that in the above example. It is kg m/s2. We call the work done by the force the work done against gravity. What is the tension in the string when its length is 5m? Mechanics is tricky at first, there are loads of formulas to get your head around, it's where you'll get yourself up to the standards required at A Level. Find the coefficient of friction between the particle and the plane. 22 g (2)/2 = 10w2 1.1 Quantities, Units & Modelling. It can be calculated using: If the particle is at 0 when t = 0, then the following equation also holds: If the particle is at P or Q when t = 0, then the following equation also holds: A simple pendulum consists of a particle P of mass m, suspended from a fixed point by a light inextensible string of length a, as shown here: So we have approximate simple harmonic motion, where w2 = g/l . PHY105 is an advanced first year course in classical mechanics, taught at a more sophisticated level than PHY103. So if we have a constant force of magnitude F newtons, which moves a body a distance s (meters) along a flat surface, the work done is F s joules. From this equation, we can see that the velocity is maximised when x = 0, since v2 = w2a2 w2x2. A particle is moving round a circle of radius 10cm. Notes Particles Electromagnetic Radiation 3. Mechanics and Materials Revision Resources Exam Questions Video Tutorials Notes Force, Energy and Momentum Materials 5.
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