PSC 1121 Lecture Notes - Lecture 4: Apollo 15, Tennis Ball, Kinematics
Document Summary
Although one weighed far more than the other, they reached the ground at almost the same time: a tennis ball and a golf ball dropped side-by-side in air. That is: g = 9. 8 m/s^2 or approximately g = 10 m/s^2, often to show how fast we accelerate, we use g. we can say that we accelerate with 1g, 2g, 3g, etc. meaning that we accelerate with 10m/s^2, 20m/s^2, 30ms^2, etc: a sprinters acceleration is only 1/5th of g, therefore, 1g must be relatively big acceleration. Is it true that such big accelerations develop in spaceships: yes. Astronauts are trained to stand big accelerations during take-off of the spaceship or during other circumstances. A constant acceleration means the speed is changing all the time, so the speed only passes through the value of zero at the top of the path. Equations to study the motion along a straight line, with uniform acceleration.
