mechanics summary - 2.1 Kinematics(6h Distance is how far...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
2.1 Kinematics (6h) Distance is how far an object has travelled without worrying about direction. Position is the distance and direction from an arbitrary zero - a convenient place to start measuring. Displacement is the final position minus the initial position. Average speed equals total distance travelled divided by the time taken to move. Av. speed is the constant speed needed to cover the given distance in the same time. To convert kilometers per hour to metres per second, multiply by 1000 and divide by 3600. To convert kilometers per hour to metres per second, divide by 3.6. To convert metres per second to kilometers per hour, multiply by 3.6. Instantaneous speed is the speed at one instant in time. The instantaneous speed is the gradient of a distance versus time graph. When the acceleration is constant, the average speed and the instantaneous speed are the same at the mid point in time. Velocity is the speed plus the direction of motion of the object. The velocity of object A relative to object B is equal to the velocity of A minus the velocity of B. The instantaneous velocity is the gradient of a position or displacement versus time graph. When acceleration is constant, the average velocity is equal to the initial velocity plus the final velocity divided by 2. Average acceleration is the constant rate of change in velocity that will cause the same change in velocity to occur in the given time. Average acceleration equals the final velocity minus the initial velocity divided by the time. Instantaneous acceleration is the acceleration at one point in time. Instantaneous acceleration is the gradient of the velocity versus time graph. An object has positive acceleration when moving in the positive direction and getting faster or moving in the negative direction and getting slower. An object has negative acceleration when moving in the negative direction and getting faster or moving in the positive direction and getting slower. An object is still accelerating during an instantaneous stop. The area under a speed versus time graph equals the distance travelled.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern