@?physics

What is the _word- equation for weight?? $$ \text{weight} = \text{mass} \times \text{gravitational field strength} $$ What is the symbol equation for weight?? $$ W = mg $$ The equation $W=mg$ is a special case of which more general formula?? $$ F = ma $$ What are the two different units for $g$, the acceleration due to gravity?? $$ \frac{N}{kg} \\ ms^{-2} $$ Which SUVAT equation would be the most useful for calculating $g$?? $$ s = ut + \frac{1}{2}at^2 $$

What is a moment?? The turning effect produced by a force around a pivot point. What is the word formula for moments?? $$ \text{moment} = \text{force} \times \text{perpindicular distance} $$ What is the symbol formula for moments?? $$ M = Fd $$ The formula $M = Fd$ is the formula for…?? Moments. What is the principle of moments?? When a body is balanced, the total clockwise moment about a point equals the total anticlockwise moment.

What’s another name for air resistance?? Drag. What is the difference between air resistance and drag?? Drag is applicable to fluids other than air. What are the three questions that you should ask at each stage of free fall?? What are the forces? What is the resultant force? What is happening? What’s an easy way to remember the three questions you ask at each stage of free fall?? Forces, resultant, result. A skydiver has just left a plane.

What is the formula for stopping distances?? $$ \text{stopping distance} = \text{thinking distance} + \text{braking distance} $$ What affects reaction time in the context of stopping distances?? Tiredness Alcohol Drugs Other passengers What are the two factors that affect stopping distance?? Reaction time Speed of the vehicle Assuming a constant velocity ($v$) during reaction time, what is the formula for thinking distance?? $$ s = vt $$ What are the three factors that affect braking distance?

When is terminal velocity reached?? When the resultant force on a falling object is zero. What’s the formula for percentage difference?? $$ \text{percentage difference} = \frac{\text{actual} - \text{yours}}{\text{actual}} $$ What’s an alternative to the words more/less or goes up/down in Physics?? Increases. What’s an alternative to the phrase “balanced forces”?? Net force or resultant force is zero. What is the centre of gravity?? The point on an object at which the entire weight of the object may be considered to act.

What is the wordy definition of Newton’s second law of motion?? The acceleration of an object is directly proportional to the net force ating on the object, is in the direction of the net force and is inversely proportional to the mass of the object. What’s the basic jist of Newton’s second law of motion?? Acceleration is affected in two ways: Increased by more force Decreased by more mass Acceleration is directly proportional to?

What does $s$ stand for in SUVAT?? Displacement. What does $u$ stand for in SUVAT?? Initial velocity. What does $v$ stand for in SUVAT?? Final velocity. What does $a$ stand for in SUVAT?? Acceleration. What does $t$ stand for in SUVAT?? Time. What is the acronym for the equations of uniform motion?? SUVAT. By considering PHOTO, what is a general equation for the area under the graph?? $$ \text{area} = ut + \frac{v - u}{2} $$

Physics Syllabus Link to specification: https://www.ocr.org.uk/Images/171726-specification-accredited-a-level-gce-physics-a-h556.pdf Exams: [[Physics - Exams]]?? AS-Level [[Physics - Units and Prefixes]]S [[Physics - Vectors and Scalars]]S [[Physics - Distance and Velocity Time Graphs]]?? [[Physics - Vernier Callipers and Micrometers]]S [[Physics - Uncertainty]]S [[Physics - Galileo's Slope Experiment]]S [[Physics - Combining Vectors]]S [[Physics - Resolving Vectors]]S [[Physics - Syllabus]]S [[Physics - SUVAT Equations]]S [[Physics - Force and Newtons]]S [[Physics - Stopping Distances]]S [[Physics - Free Fall]]S [[Physics - Moments]]S [[Physics - Calculating Acceleration Due To Gravity]]S [[Physics - Equilibrium]]S [[Physics - Projectiles]]S [[Physics - Density]]S [[Physics - Pressure]]S [[Physics - Archimedes' Principle]]S [[Physics - Hooke's Law]]S [[Physics - Work Done]]S [[Physics - Energy]]S [[Physics - Power]]S [[Physics - Elastic Potential Energy]]S [[Physics - Momentum]]S [[Physics - Charge and Current]]S [[Physics - Circuits]]S [[Physics - Electron Drift Velocity]]S [[Physics - Collisions in 2D]]S [[Physics - Voltage and Potential Difference]]S [[Physics - Resistance and Ohm's Law]]S [[Physics - Resistivity]]S [[Physics - Waves]]S [[Physics - Thermistors and LDRs]]S [[Physics - Oscilliscopes]]S [[Physics - Reflection and Refraction]]S [[Physics - Diffraction]]S [[Physics - Polarisation]]S [[Physics - Intensity]]S [[Physics - Electromagnetic Waves]]S [[Physics - Young's Modulus]]S [[Physics - Internal Resistance]]S [[Physics - Potential Dividers]]S [[Physics - Quantum Physics]]S [[Physics - Electromagnetic Radiation]]S [[Physics - The Photoelectric Effect]]S [[Physics - Superposition]]S [[Physics - Wave-Particle Duality]]S [[Physics - Standing Waves]]S Recall Questions for AS-Level [[Physics - Recall for Chapter 3: Motion]]S [[Physics - Recall for Chapter 4: Forces in Action]]S [[Phyiscs - Recall for Chapter 5: Work, Energy and Power]]S [[Physics - Recall for Chapter 6: Materials]]S [[Physics - Recall for Chapter 7: Laws of Motion and Momentum]]S [[Physics - Recall for Chapter 8: Current and Charge]]S [[Phyiscs - Recall for Chapter 9: Energy, Power and Resistance]]S [[Physics - Recall for Chapter 10: Electrical Circuits]]S [[Physics - Recall for Chapter 11: Waves I]]S [[Physics - Recall for Chapter 12: Waves II]]S [[Physics - Recall for Chapter 13: Quantum Physics]]S A-Level [[Physics - Spectra]]S [[Physics - Circular Motion]]S [[Physics - Thermal Physics]]S [[Physics - Oscillations]]S [[Physics - Moles]]S [[Physics - Ideal Gases]]S [[Physics - Gravitational Fields]]S [[Physics - Kepler's Laws]]S [[Physics - Satellites]]S [[Physics - Gravitational Potential]]S [[Physics - Stellar Evolution]]S [[Physics - Objects in the Universe]]S [[Physics - The Nuclear Atom]]S [[Physics - Hertzsprung-Russell Diagrams]]S [[Physics - Black-Body Curves]]S [[Physics - Standard Model]]S [[Physics - Beta Decay]]S [[Physics - Cosmology]]S [[Physics - Radioactivity]]S [[Physics - Misc]]S Spec Module 1: Development of Practical Skills in Physics (Y12 & Y13) Practical skills assessed in a written exam Practical skills assessed in the practical endorsement Module 2: Foundations in Physics (Y12 & Y13) Physical quantities and units Making measurements and analysing data Nature of quantities Module 3: Forces and Motion (Y12) Motion Forces in action Work, energy and power Materials Newton’s laws of motion and momentum Module 4: Electrons, Waves and Photons (Y12) Charge and current Energy, power and resistance Electrical circuits Waves Quantum physics Module 5: Newtonian World and Astrophysics (Y13) Thermal physics Circular motion Oscillations Gravitational fields Astrophysics and cosmology Module 6: Particles and Medical Physics (Y13) Capacitors Electric fields Electromagnetism Nuclear and particle physics Medical imaging Info This page was last updated 2022-02-21.

Resolving Vectors This links to [[Physics - Combining Vectors]]S , since it’s like doing it in reverse. What is resolving vectors?? Finding the horizontal and vertical component of a vector. What is resolving vectors opposite to…?? Combining a vector. How is the the horizontal component of $F$ written?? $F_x$. What is $F_x$?? The horizontal component of vector $F$. How is the the vertical component of $F$ written?? $F_y$. What is $F_y$?? The vertical component of vector $F$.

Combining Vectors Combining Vectors is [[Physics - Resolving Vectors]]S in reverse, or vice-versa. What is the golden rule for adding vectors?? Always add vectors tip to tail. Combine these vectors, a boat moving $10kmh^{-1}$ across a $10kmh^{-1}$ flowing river PHOTO?? PHOTO $\sqrt{10^2 + 10^2} = \sqrt{200} = 10\sqrt{2} kmh^{-1}$ When can Pythagoras be used to combine two vectors?? When two known forces are at a right angle. How can you work out the angle between two forces?

What is kinematics?? Analysing the motion of an object (without caring about what causes the motion). Why would $10.1 \pm 0.5ms^{-2}$ be an acceptable value for $g$?? Because the actual value of $g$ is $9.81ms^{-2}$, so the result is within the range of uncertainty. What did Galileo predict about the motion of a falling object?? That its acceleration is uniform. What is the equation for the velocity of a falling object?? $$ v = at $$

Uncertainty What are the two types of uncertainty?? Absolute uncertainty Percentage uncertainty What is absolute uncertainty?? A number that gives the range of values for an experiment. E.g. $7.3mm \pm 0.2mm$ What is percentage uncertainty equal to for a single measurement?? The resolution of the equipment. What is percentage uncertainty equal to for multiple measurements?? The range of values divided by two. What is the percentage uncertainty for $0.65mm, 0.58mm, 0.62mm$?? $\pm 0.