Physics 5- Scalar and Vector Quantities 5.0 / 5 based on 1 rating ? PhysicsForces and MotionGCSEAQA Created by: nicgraceCreated on: 12-03-18 20:23 Scalar quantity Has magnitude (size) only, e.g no. apples. 1 of 24 Vector quantity Has magnitude and direction of travel. 2 of 24 The length of the arrow shows the magnitude. 3 of 24 The point of the arrow shows The direction that the vector quantity is acting. 4 of 24 Forces Are vector quantities. 5 of 24 A force occurs When two or more objects interact. 6 of 24 Contact forces The objects are actually touching, e.g tension of people pulling against each other. 7 of 24 Non-contact forces The objects are not touching, e.g gravity acts when objects are not touching. 8 of 24 Names of contact forces Friction, air-resistance/drag, tension, normal contact force, upthrust. 9 of 24 Names of non-contact forces Gravitational force, electrostatic force, magnetic force. 10 of 24 A force is A vector quantity, when objects interact. 11 of 24 Gravity A force of attraction between all masses. 12 of 24 The force of gravity close to the Earth is due To the gravitational field (GFS) around the planet. 13 of 24 Mass Of an object is related to the amount of matter it contains and is constant. 14 of 24 Weight The force acting on an object due to gravity. 15 of 24 The weight of an object depends on The GFS where the object is and is directly proportional to its mass. 16 of 24 ∝ To indicate two things are proportional. 17 of 24 Gravity on Earth 10N 18 of 24 Weight (N)= Mass (Kg) x GFS(N/Kg) or W=mg 19 of 24 Resultant force When more than one force acts on an object, these forces can be seen as a single force that has the same effect as all the forces acting together. 20 of 24 Free body diagram Used to show different forces acting on an object. 21 of 24 Scale vector diagram Used to illustrate the overall effect when one or more forces acts on anobject. 22 of 24 The resultant force (FR) = Force 1 (F1) + Force 2 (F2) 23 of 24 Scale vector diagrams can also be used for When a force is acting in a diagonal direction. 24 of 24
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