UNIT 4 FORCES AND MOTION FORCE VIDEO http

UNIT 4 FORCES AND MOTION

FORCE VIDEO • http: //studyjams. scholastic. com/studyjams/science/forces-andmotion/force-and-motion. htm • How did the soccer ball move? • What is a force? • What kind of force was done on the soccer ball? • The force of the kick sent the ball in motion.

VIDEO CONTINUED • Inertia: tendency for an object to resist change in motion. • Ball was sitting still before being kicked. • Friction: A force acting against a moving object. • • Texture of grace. More friction means more force needed.

FILL IN THE BLANK • A force is a push or pull that acts on an object. • Every force has a strength, or magnitude. This strength is measured in units called newtons (N). • Forces can change the way objects move. • Write an example on how forces are exerted on an object. (examples on page 62)

CONTACT FORCES • A force that requires two pieces of matter to touch is called a Contact Force. • One kind of contact force is Friction is the force that results when two materials rub against each other. • Solids are not the only materials that can cause friction. also resist motion when an object pushes against them. Air and water

CONTINUE WITH GRAPHIC ORGANIZER

NON-CONTACT FORCES • A force that acts at a distance is called a non-contact force. • Three examples of non-contact forces are: • ___Gravity • ___Electric force • ___Magnetic Force

BALANCED AND UNBALANCED FORCES Balanced Forces • Equal forces that combine to act on an object in opposite directions are Balanced Forces. • When the net forces are equal the forces are zero. Unbalanced Forces • Unbalanced forces occurs when one of the forces action upon an object is greater than another force.

BALANCED FORCE

UNBALANCED FORCES

BALANCED AND UNBALANCED FORCES

BRAINPOP GAME • https: //www. brainpop. com/games/balancingact/

TUG A WAR

FILL OUT THE FIRST PAGE WITH WHAT YOU THINK WILL HAPPEN. • Boys vs. Girls • Even number of students on one side vs. even number of students on the other side.

ACCELERATION

ACCELERATION • http: //studyjams. scholastic. com/studyjams/science/forces-andmotion/acceleration. htm • Rate at which the speed or direction of motion changes over time. • Acceleration is not just when an object is speeding up. • In science it means any change in motion. • If the object moves in a straight line with no change in speed, there is no acceleration. • What can you think of that has acceleration?

• Motion without acceleration is uniform motion. • An example would be a train on a straight track at a steady speed.

RESOURCES: • • • http: //studyjams. scholastic. com/studyjams/science/forces-and-motion/force-and-motion. htm Persons interactive book. Brain pop Standards 5. P. 5: The student will demonstrate an understanding of the factors that affect the motion of an object 5. P. 5 A. 2 Develop and use models to explain how the amount or type of force (contact and noncontact) affects the motion of an object. 5. P. 5 A. 3 Plan and conduct controlled scientific investigations to test the effects of balanced and unbalanced forces on the rate and direction of motion of objects.