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Presentation transcript:

Write down the info on the slides that have a star! #36 Forces Write down the info on the slides that have a star!

Force: a push or a pull in a particular direction

Forces: -have a size (magnitude) - act in a particular direction -cause motion -balanced when all forces acting on an object are equal -measured in Newtons

Vectors Arrows that show the size and direction of a force 2/17/2019

-What is happening in the picture? -The forces shown above are: pushing or pulling? -These forces are: working together/opposite forces? -The forces are: balanced/unbalanced? -Is there motion or not?

-The forces shown above are: pushing or pulling -The forces shown above are: pushing or pulling? -These forces are: working together/opposite forces? -The forces are: balanced/unbalanced? -The stronger force is pulling to the right/left? -The weaker force is to the right/left? - Motion is to the right/left?

Different types of force: Friction https://www.youtube.com/watch?v=MAqrWvkBoHk Gravity https://www.youtube.com/watch?v=lY3XV_GGV0M Elastic Force https://www.youtube.com/watch?v=wBbvFroosmg Contact Force Centripetal Force Muscular Force 2/17/2019

Different Types of Forces A force that resists the motion between two surfaces pressed together The force of attraction between 2 masses- the strength depends on the masses Friction Gravity 2/17/2019

Different types of force: Elastic force Contact force Associated with rubber bands, springs, and other materials that stretch easily when acted on by a force. When one object pushes or pulls another object by touching it. The first object is applying contact force to the second object 2/17/2019

Different types of force: Centripetal force Muscular force Any force that keeps an object moving in a circle Any force that uses muscles to push/pull an object 2/17/2019

WHAT TYPE OF FORCES ARE INVOLVED? Hula Hoop Arm Wrestling Bouncing on a trampoline A dog sleeping on your lap 2/17/2019