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Description
Flashcards by Hannah Vernon-Browne, updated more than 1 year ago
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Created by Hannah Vernon-Browne
over 8 years ago
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| Question | Answer |
| Speed | rate of change of distance speed = distance/time |
| Velocity | rate of change of displacement velocity = displacement/time |
| Displacement | the vector measurement of a distance in a certain direction |
| Vector | has magnitude & direction |
| Scalar | has only magnitude |
| Average speed | average speed = total distance/total time |
| Instantaneous speed | the speed at any particular instant in time on a journey, which can be found from the gradient of the tangent on a time-distance graph at that time |
| Acceleration | the vector that is the rate of change of velocity a = (v-u) / t v = final velocity u = original velocity t = time |
| Displacement - time graph | a graph showing the positions visited on a journey, with displacement on the y-axis and time on the x-axis |
| Velocity - time graph | a graph showing the velocities on a journey, with velocity on the y-axis and time on the x - axis |
| Resultant Force | the total force (vector sum) acting on a body when all of the forces acting are added together accounting for direction |
| Free - body Force Diagram | has an object isolated with all forces acting on it at the points where they act, using arrows to represent the forces |
| Equilibrium | when a body has no resultant force or resultant movement acting on it (0 acceleration) |
| Principle of Moments | a body will be in equilibrium if the sum of the clockwise moments = the sum of the anti-clockwise moments |
| Centre of Gravity of an Object | the point through which the weight of the object appears to act |
| Newton's 1st Law of Motion | An object will remain at rest, or in a state of uniform motion, until acted upon by a resultant force |
| Newton's 2nd Law of Motion | If an object's mass is constant, the resultant force needed to cause an acceleration is given by the equation: F=ma |
| Newton's 3rd Law of Motion | For every action, there is an equal and opposite reaction |
| Kinematics | the study of the description of the motion of objects |
| Uniform Motion | motion where there is no acceleration velocity = displacement / time |
| Resolution / Resolving Vectors | the determination of a pair of vectors, at right angles to each other, that sums to give the single vector they were resolved from |
| Projectile | a moving object on which the only force of significance acting is gravity. The trajectory thus is pre-determined by its initial velocity |
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