Flashcards
Physics Unit 2.1 Key Terms
Cards in this deck (22)
- 1Speedrate of change of distance
speed = distance/time - 2Velocityrate of change of displacement
velocity = displacement/time - 3Displacementthe vector measurement of a distance in a certain direction
- 4Vectorhas magnitude & direction
- 5Scalarhas only magnitude
- 6Average speedaverage speed = total distance/total time
- 7Instantaneous speedthe 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
- 8Accelerationthe vector that is the rate of change of velocity
a = (v-u) / t
v = final velocity
u = original velocity
t = time - 9Displacement - time grapha graph showing the positions visited on a journey, with displacement on the y-axis and time on the x-axis
- 10Velocity - time grapha graph showing the velocities on a journey, with velocity on the y-axis and time on the x - axis
- 11Resultant Forcethe total force (vector sum) acting on a body when all of the forces acting are added together accounting for direction
- 12Free - body Force Diagramhas an object isolated with all forces acting on it at the points where they act, using arrows to represent the forces
- 13Equilibriumwhen a body has no resultant force or resultant movement acting on it (0 acceleration)
- 14Principle of Momentsa body will be in equilibrium if the sum of the clockwise moments = the sum of the anti-clockwise moments
- 15Centre of Gravity of an Objectthe point through which the weight of the object appears to act
- 16Newton's 1st Law of MotionAn object will remain at rest, or in a state of uniform motion, until acted upon by a resultant force
- 17Newton's 2nd Law of MotionIf an object's mass is constant, the resultant force needed to cause an acceleration is given by the equation:
F=ma - 18Newton's 3rd Law of MotionFor every action, there is an equal and opposite reaction
- 19Kinematicsthe study of the description of the motion of objects
- 20Uniform Motionmotion where there is no acceleration
velocity = displacement / time - 21Resolution / Resolving Vectorsthe determination of a pair of vectors, at right angles to each other, that sums to give the single vector they were resolved from
- 22Projectilea 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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- AS - Level Physics (Topic 2 - Mechanics) Flashcards on Physics Unit 2.1 Key Terms, created by Hannah Vernon-Browne on 15/11/2015.
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- Hannah Vernon-Browne
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