FORCE AND MOTION

K-3

SP.3.1 - Stationary or moving objects can be described.

SP.3.2 - Force is the name given to pushes and pulls and can cause a change in the motion of an object.

SP.3.3 - Machines are made of parts that move and whose purpose is always the same: change the effect of an applied force.

3-6

SI.3.1 - A moving object is one which changes position as time passes.

SI.3.2 - Changes in the motion of an object depend upon its momentum and the amount and direction of the forces acting upon it.

SI.3.3 - If a certain force is applied to a machine through a certaindistance, a machine's output can be either a larger force acting over asmaller distance or a smaller force acting over a greater distance.

6-9

SJ.3.1 - To specify the velocity of an object, it is necessary to know the speed and direction in which the object is moving.

SJ.3.2 - A net force acting on an object causes its momentum to change, and the longer the net force acts, the more the momentum will change.

SJ.3.3 - The work output of a machine can be no greater than the work put into it.

9-12

SH.3.1 - Changing velocity, uniform circular motion, and oscillatory motion represent examples of motion in which the acceleration of an object changes.

SH.3.2 - The forces we experience in our daily lives are the result of either gravitation or electric forces; all motion (of objects individually, between objects, etc.) may be described (mathematically or otherwise) in relation to these forces.

SH.3.3 - The efficiency of a machine is the ratio of the output of the machine to the input.