Vocabulary



**Motion ** – A change in the speed or position of an object relative to the things around them. **Velocity – **The speed and Direction of an object **Force – **A push or pull on an object, causing a change in motion. **Gravity **– The fundamental force of attraction between all objects. The more mass an object has, the greater the force of its gravity. **Friction **– The force that opposes movement between objects that are touching. <span style="color: #800080; font-family: 'Lucida Sans Unicode','Lucida Grande',sans-serif; font-size: 120%;">**<span style="font-family: "Cambria","serif";">Balanced forces – **<span style="font-family: "Cambria","serif";">When opposing forces push and pull equally on an object with no change in motion. <span style="color: #800080; font-family: 'Lucida Sans Unicode','Lucida Grande',sans-serif; font-size: 120%;">**<span style="font-family: "Cambria","serif";">Equilibrium – **<span style="font-family: "Cambria","serif";">The condition when all forces are balanced and there is no change in motion. <span style="color: #800080; font-family: 'Lucida Sans Unicode','Lucida Grande',sans-serif; font-size: 120%;">**<span style="font-family: "Cambria","serif";">Inertia ­– **<span style="font-family: "Cambria","serif";">The property of matter which causes an object to resist a change of direction or speed. The amount of inertia depends upon the object’s mass. <span style="color: #800080; font-family: 'Lucida Sans Unicode','Lucida Grande',sans-serif; font-size: 120%;">**<span style="font-family: "Cambria","serif";">Momentum – **<span style="font-family: "Cambria","serif";">The mass of an object times its velocity. The greater the momentum of an object, the harder it is to slow it down. <span style="color: #800080; font-family: 'Lucida Sans Unicode','Lucida Grande',sans-serif; font-size: 120%;">**<span style="font-family: "Cambria","serif";">Acceleration – **Any change in an object’s direction or rate of speed. <span style="font-family: "Cambria","serif";"> <span style="font-family: "Cambria","serif";"> <span style="font-family: "Cambria","serif";">