AQA GCSE COMBINED SCIENCE: TRILOGY HIGHER PHYSICS PAPER 2H EXAM

AQA GCSE COMBINED SCIENCE: TRILOGY HIGHER PHYSICS PAPER 2H EXAM Vector quantities - ANSWER-have magnitude and direction Examples of vector quantities - ANSWER-force, velocity, momentum, acceleration Scalar quantities - ANSWER-Only have magnitude and no direction Examples of scalar quantities - ANSWER-speed, distance, time Vectors - ANSWER-represented by an arrow - the length of the arrow shows the magnitude. The direction of the arrow shows the direction of the quantity A force is - ANSWER-a push or pull on an object that is caused by it interacting with something when two objects are touching for the force to act, it’s a .... - ANSWER-contact force examples of contact forces - ANSWER-friction, air resistance, tension in ropes. etc If the objects do not need to be touching for the force to act, the force is a ...... - ANSWER-non contact force examples of non-contact forces - ANSWER-magnetic force and gravitational force Two effects of gravity - ANSWER-- makes all things fall towards the ground - gives everything a weight What is mass? - ANSWER-The amount of material an object is made of It is the same value everywhere Measured using a mass balance What is weight? - ANSWER-The force acting on an object due to gravity It depends on the strength of the gravitational field at the location of the object Measured using a calibrated spring balance - newtonmeter Equation for Weight - ANSWER-Weight (N) = Mass (kg) x Gravitational Field Strength (N/kg) W=mg What is weight directly proportional to? - ANSWER-mass What are free body diagrams? - ANSWER-Diagrams that show all the forces acting on an object What is the resultant force? - ANSWER-The single force that replaces multiple forces acting at a single point How is work done? - ANSWER-When a force moves an object through a distance, energy is transferred and work is done on the object Equation for 'Work Done' - ANSWER-Work done (J) = Force (N) x Distance (m) W=Fs What is 1J equal to? - ANSWER-1Nm If all the forces acting on an object combine to give a resultant force of zero then the object is in ? - ANSWER-equilibrium What could happen when you apply a force to an object? - ANSWER-It may stretch, compress or bend What happens when an object is elastically deformed - ANSWER-The object can go back to its original shape and length after the force has been removed What happens when an object is inelastically deformed? - ANSWER-The object won't return to its original shape and length after the force has been removed Equation for Force 1 - ANSWER-Force (N) = Spring Constant (N/m) x Extension (m) F=ke Extension is directly proportional to? (Hooke's Law) - ANSWER-The force applied F∝e What is the limit of proportionality? - ANSWER-The point at which extension is no longer directly proportional to force Practical: Investigating the link between force and extension - ANSWER-- First, measure the original length of the spring using a milimetre ruler - Next, add different masses on the spring and measure the length of the spring in each case. - The extension = change in length - Repeat this process until you have enough measurements (no fewer than 6) - Plot a graph with extension of the spring on the x axis and force on the y axis. - The graph will only start to curve if you exceed the limit of proportionality Equation for Elastic potential energy - ANSWER-Elastic potential energy (J) = 1/2 x Spring Constant (N/m) x extension^2 (m) Ee = 1/2Ke^2 What is displacement? - ANSWER-It measures the distance and direction in a straight line from an object's starting point to its finishing point What is velocity? - ANSWER-Speed (how fast you're going) in a given direction Equation for Speed - ANSWER-Distance Travelled (m) = Speed (m/s) x Time (s) s=vt typical speeds - ANSWER-typical speed of a person walking 1.5m/s typical speed of a person running 3m/s Typical speed of a person cycling 6m/s what is the typical speed of a car 25m/s Typical speed of a train 55m/s Continues...