Read about the basic concepts of the force of gravity and the two main factors (distance and mass) that affect the strength of gravity.
MODEL CURRICULUM (GRADE 8) Physical Science
TOPIC- Forces and Motion
CONTENT STATEMENT- Forces between objects act when the object is in direct contact or when they are not touching. Magnetic, electrical and gravitational forces can act at a distance.
GRADE 8 CONCEPTS- Magnetic forces weaken rapidly with increasing distance. Gravitational force weakens rapidly with increasing distance. Every object exerts gravitational force on every other object with mass. The gravitational force increases with the mass of the object, decreases rapidly with increasing distance and points towards the center of objects.