# Physics 2 Unit 1 Unit 2

 How is speed calculated? Speed = distance➗time What is meant by velocity? Velocity is speed in a give direction How is acceleration calculated? a = ( v - u ) ➗t a = accelerationv = final velocityu = initial velocityt = time What does the area underneath a velocity-time graph represent? The distance traveled in a given time What are forces measured in? Newtons Name the different types of forces? GravityReaction (Upthrust)During force (thrust)Air resistanceWater resistance What is meant by resultant force? This is a single force that had the same effect as all forces acting on an objectE.g. Relation - gravity = RF What if the resultant force of an object is not 0? There will be an acceleration in the direction of the force.E.g. During force (1000N) - Air resistance (600N) = Resultant force (400N) How is resultant force calculated? F = m x a What is meant by the stopping distance of a vehicle? This is the distance traveled during the drivers thinking distance + braking distance How is thinking distance increased? TirednessAlcoholDrugs How can braking distance be increased? Poor roadsBad weatherPoor conditions of the car What is meant by the terminal velocity? This is when the object moves at a steady speed How is weight calculated? Weight = Mass x Gravity What is meant by an elastic object? An elastic object is one that regains its original shape after force is removed What is meant by elastic potential energy? Energy stored in an elastic potential energy when work is done to change its shape What does hooks law state? The extension of an elastic object is directly proportional to the force applied, providing the limit of proportionality is not exceeded What is the limit of proportionality of an object? This is the limit in which the object can withstand force What's the equation for hooks law? F = k x e F = Force appliedk = spring constante = extension AuthorRvynvega ID219080 Card SetPhysics 2 Unit 1 Unit 2 DescriptionMotion and Forces Updated2013-05-11T18:11:07Z Show Answers