Measurements, kinematics and dynamics Flashcards
random error
measured values are scattered around the true value with no fixed pattern
systematic error
measured values are consistently larger or consistently smaller than the true value
displacement
straight line distance from start to finish point, in that direction
distance
total length of the actual path travelled between start and finished points
Newton’s First Law of Motion
an object continues to be in a state of rest or in motion with a constant velocity, unless acted upon by a resultant force
linear momentum of a body
the product of its mass and its velocity
Newton’s Second Law of Motion
the rate of change of momentum of a body is directly proportional to the resultant force acting on it and takes place in the direction of the resultant force.
Newton’s Third Law of Motion
when body A exerts a force on body B, force on body A is equal in magnitude to force on body B from A. Both forces are in opposite directions and are of the same kind
mass
the mass of a body is the property of a body which resists change in motion
weight
the weight of a body is the force acting on it due to a gravitational field
impulse
the product of the force and the time duration of the impact
the principle of conservation of linear momentum
states that the total linear momentum of a system remains constant provided that no resultant external force acts on the system
elastic collision
an elastic collision is a collision in which the total kinetic energy of the colliding bodies is conserved
perfectly inelastic collision
a perfectly inelastic collision is a collision where the colliding bodies will coalesce with one another and move off with the same velocity
