physic

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Author:
Bakhrom
ID:
51255
Filename:
physic
Updated:
2010-11-24 15:09:52
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Physic laws
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Physics laws
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  1. Speed
    • Speed is distance travelled by an object per unit of time
    • speed=distance travelled / time


  2. velocity


    velocity is speed in a given direction; it therefore tells us two things about moving object: its speed and its direction


  3. acceleration


    • The rate of change of velocity is called acceleration. Acceleration refers to any change of velocity, either positive or negative.
    • acceleration= final velocity-original velocity / time


  4. Momentum


    • Momentum an object traveling at a specific velocity has quantity called momentum.
    • Momentum=mass x velocity
    • p = mv EX. p = (2.0 kg)(4.0 m/s); p = 8.0 kg-m/s


  5. Newton's first law


    The law of inertia, states that objects in motion tend to stay in motion and that object at rest tend to stay at rest.


  6. Newton's 2 Laws


    • Newton’s second law describes the relationship between force, mass, and acceleration. It states that the force applied on an object equals the mass of the object times its acceleration.
    • Force= mass x acceleration (F=ma).


  7. Newton's 3 Law


    The third law states that for every force there is an equal and opposite force. For example, if you push on a wall, it will push back on you as hard as you are pushing on it. The blast from the back of the rockets pushes the rocket forward.


  8. Density


    • Density is a physical property of matter that is defined as the ratio of an object's mass to its volume.
    • Density=mass/volume


  9. Energy


    • Energy is ability to do work
    • kinetic energy
    • Kinetic energy is energy associated with motion. Any moving body has this type energy because it is able to do work by moving other bodies.
    • Kinetic energy = ½(mass x velocity)2


  10. Potential energy


    Potential energy is the energy stored in a body because of its position


  11. Work


    • Work is defined as the product of the force applied to an object and the distance through which the force is applied. Work is the transfer of energy. Work has a specific definition in physics, it is equal to the force needed to move an object multiplied by the distance it moved.
    • Work = Force x Distance
    • How much work is done if a force of 20 N is used to displace an object 3 m? W = (20 N)(3 m)=60N-m. =60 Joules because 1 Joule is equal to 1 Newton-meter


  12. Joule


    A joule is the unit of energy equal to the work done by a force of 1 Newton acting over distance of 1 meter. One joule is the amount of energy it takes to lift an object that weighs one Newton a one meter distance.



  13. Power



    • Power is rate at which work is done. The power of a machine is the total work done divided by the same time taken. Since work equals force times distance, the formula power is:
    • Power = work/time



  14. The six simple machines



    The six simple machines are the lever, wedge, screw, inclines planes, wheel and axle, and pulley


  15. inclined plane


    An inclined plane is a simple machine. An inclined plane is a ramp used to reduce the effort needed to raise or lower an object over a vertical height.


  16. wedge


    A wedge (klin) is a moving inclined plane


  17. Lever


    A lever( richag) is a simple machine. A lever bar exerts a force to move a load by turning on a pivot or fulcrum

  18. Pulley
    • Pulley is a chain or rope wrapped around a wheel

  19. A wheel and axle
    • A wheel and axle act as a lever that rotates in a circle

  20. A screw
    • A screw is an inclined plane wrapped around a cylinder

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