IB Physics HL Exam Questions with 100% Correct Answers

Fundamental SI units - ANSWER-kilogram (kg), metre (m), second (s), ampere (amp), mole (mol), kelvin (K) Random error - ANSWER-An unpredictable and largely uncontrollable uncertainty. (Examples include human reaction time and other forms of human measurement.) (Random errors can be reduced by taking the average of repeated measurements.) Systematic error - ANSWER-An error that occurs on all measurements. (An example is a zero error on a scale.) (Systematic errors can NOT be reduced by repeated measurement.) Vectors - ANSWER-displacement, velocity, acceleration, force, momentum. Scalars - ANSWER-mass, length, speed, energy, time. Displacement - ANSWER-the position of an object relative to a defined starting position Velocity - ANSWER-the rate at which displacement changes (with time) Speed - ANSWER-the rate at which distance changes (with time) Acceleration - ANSWER-the rate at which velocity changes (with time) Instantaneous speed - ANSWER-the speed at a particular moment in time Average speed - ANSWER-the total distance travelled divided by the total time taken (the average rate of movement) Equations of uniformly accelerated motion - ANSWER-v = u + at s = ½(u+v)t s = ut + ½ at² v² = u² + 2as Newton's First Law - ANSWER-A body will continue in its current state of motion (velocity) unless acted upon by a resultant force (a = 0 if ∑F = 0) Newton's Second Law - ANSWER-The acceleration of a body is proportional to the resultant force acting on the body (and is in the same direction) ∑F=ma ∑F= Δp/Δt