Force and Motion Chastain 2017 3.2

S8P3b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction.

Newton’s First Law An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Also Called the Law of Inertia.

Inertia This is the tendency of an object to resist a change in motion. Inertia depends on Mass. Some objects have more inertia than others. https://www.youtube.com/watch?v=Ncn2LH9yYms

Newton’s 2nd Law Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). https://www.youtube.com/watch?v=ZvPrn3aBQG8

Newton’s 3rd law For every action there is an equal and opposite re-action. SIMPLY: If you push an object, that object pushes back in the opposite direction equally hard. https://www.youtube.com/watch?v=EgqcGrB3re8

Examples: Pushing or pulling Force Using energy to do work. Examples: Pushing or pulling https://www.yout ube.com/watch?v =_LdcxCdB-s8

balanced Force Equal forces acting on one object in opposite directions are called balanced forces. Each force is balanced by the other. Balanced forces acting on an object do not change the objects motion.

unBalanced Force When the force acting on one side of an object is less or more than on the other side of the object. Unbalanced forces acting on an object result in a net force and cause a change in the object’s motion. https://www.youtube.com/watch?v=HEJOybRxclk

On-Level: TOTD How would you explain the affects of mass on an object’s movement across a smooth surface versus its movement across a rough surface?

Advanced: Science is H.O.T. https://www.youtube.com/watch?v=4yyb_RNJWUM How could you compare/contrast the theories of Newton and Einstein?