S8P3. Students will investigate relationship between force, mass, and the motion of objects. b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction.
Lubricants – are used to reduce friction. –Ex. Motor oil, wax, grease Switching from sliding to rolling friction Switching from sliding to rolling friction –Ex. Ball bearings between wheel & axles
S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.
A downward force Any 2 masses exert an attractive force on each other. Strength of gravitational force depend on: 1.) Mass 2.) Distance
What is the law of universal gravitation? All objects are attracted to each by gravitational force. –The larger the object – The greater the force –The closer together the object – the greater the force.
Mass – how much matter makes up an object –(Doesn’t change as you move from the Earth to the moon.) Weight – considered to be a gravitational force –(Decreases as you move from the Earth to the moon.)