Who proposed the law of universal gravitation?, Isaac Newton, What force pulls objects toward each other?, Gravity, What fruit in the famous story helped inspire Newton’s idea about gravity?, Apple, According to the law of universal gravitation, gravity acts between what kind of objects in the universe?, All objects, What type of force pulls objects together?, Attractive force, What property of an object affects the strength of gravitational force?, Mass, What factor related to how far objects are apart affects gravitational force?, Distance, What happens to gravitational force when the mass of objects becomes larger?, Increases, What happens to gravitational force when the distance between objects becomes greater? , Decreases, What is the force exerted by gravity on an object called?, Weight, What property of matter determines how much matter an object contains?, Mass, What quantity is multiplied by gravitational field strength to find weight?, Mass, What unit is used to measure weight?, Newton (N), What is the approximate gravitational field strength of Earth?, 10 N/kg, What is the weight of a 1-kilogram object on Earth?, 10 newtons, Which celestial body has weaker gravity than Earth causing objects to weigh less?, Moon, What happens to the speed of a ball thrown upward as it moves higher?, decreases, What force keeps the Moon moving around Earth?, gravity, What star keeps the planets moving in orbit?, sun, What force opposes motion between surfaces that touch?, friction, What occurs when two surfaces rub against each other and resist movement?, friction, What happens to friction when surfaces are rougher?, it increases, What form of energy is produced when two surfaces rub together?, heat, What type of friction acts on objects that are not moving?, static friction, What type of friction acts on objects that are already moving across a surface?, sliding friction, What type of resistance acts on objects moving through air?, air resistance, What type of resistance acts on objects moving through water?, water resistance, What everyday activity becomes possible because friction prevents us from slipping?, walking, What substance is applied to surfaces to reduce friction, lubricant, What force pulls falling objects toward Earth?, gravity.

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