Motionnotes
- 1. Motion: movement from one point to another • Point of reference, is a point that shows motion of an object • Distance, the length of space between point A.____. point B measured by meters (m) • Displacement, the distance and the direction of travel example: 1mN° It is also the shortest path from A to B Speed: • Average speed s = d t • speed equals distance over time, it is the rate of time spent traveling a certain distance measured in meters per second m/s • Instantaneous speed a block of speed taken from the whole distance |-----------|---| • Velocity: speed and direction of travel • Distance vs time graph: distance is plotted on the y axis and time is plotted on the x axis
- 2. Acceleration: A = (sf – si) t Acceleration = (final speed minus initial speed) Divided by time The unit of measure for acceleration is m/s² = meters per second squared • Positive acceleration → Direction of travel Speeding up → = positive acceleration • Negative acceleration → Direction of travel Slowing down ← acceleration = negative acceleration Momentum: the measure of how hard it is to stop an object, this depends on the objects mass and velocity. The formula to find momentum is: P (momentum) = m (mass) times v (velocity) P=mv • Mass, the amount of the matter in an object, the SI (metric) unit for mass is kilograms (kg)
- 3. • Weight, the force of gravity on the mass of an object. Weight can vary unlike mass. Gravity is different in different places, for example the moon is 1/6th the size of earth so the gravity on the moon is 1/6th that of earth. This means even though your mass does not change your weight would on the moon compared to earth. • The law of conservation of momentum, states that the total momentum of objects that collide is the same before and after the collision