Newton’s laws of motion

    Cards (11)

    • Newton’s first law

      An object will remain at rest or continue to travel with constant velocity unless acted upon by a resultant force.
    • Newton’s third law

      When two objects interact, they exert equal and opposite forces on each other. These forces are always the same type and have the same magnitude but they act on different objects and in opposite directions.
    • newton’s third law example

      The gravitational attraction of the earth to a person standing on it, which is equal and opposite to the gravitational attraction of the person to the earth.
    • four fundamental forces
      gravitational, electromagnetic, strong nuclear and weak nuclear
    • Newton’s second law

      The net force acting on an object is directly proportional to the rate of change of momentum and is acting in the same direction.
    • Linear momentum of an object is the product of the object’s mass and its velocity. Its SI unit is kgms^-1
    • F=ma is a special case of newton’s second law and is true when the mass of the object remains constant during the motion of the object.
    • Impulse of a force is a measure of change in momentum.
    • conservation of momentum
      For a system of interacting objects, the total momentum in a specified direction remains constant as long as no external forces act on the system.
    • perfectly elastic collision
      total kinetic energy of system remains constnt
    • inelastic collision
      some kinetic energy lost to other forms, eg heat and sound energy. Total energy and momentum are conserved.