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Force and Motion Review.

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Presentation transcript:

Do Now:

Forces Essential Question: What is a force and do we need them for Newton’s first Law?

Objectives Students will conceptually learn about forces, Gravity and Inertia.

What is a force? Definition: A push or pull applied to an object. Net Force: When two or more forces act on an object at the same time.

Types of forces Friction: the force that is created whenever two surfaces move or try to move across each other. Friction is caused by microscopic bumps on surfaces called microwelds. (ex: Static, sliding, rolling, fluid) Air Resistance: is the frictional force air exerts against a moving object. As an object moves, air resistance slows it down.

Balanced VS Unbalanced Forces Unbalanced forces: Can cause an object to start moving, stop moving, and change direction. Balanced Force: Equal forces acting on one object in opposite directions. Balancing forces acting on an object DO Not change objects' motion.

What is Gravity? Definition: any two masses that exert an attractive force on each other. Gravity depends on mass and distance between objects. Weight: Gravitational force exerted on an object; measured in units called Newton’s.

What is Thrust? Definition: is the force that propels a flying machine in the direction of motion. Engines produce thrust

How to draw a freebody diagram? 1. list all the forces acting on the object. 2. Draw an arrow of the direction that the forces is acting in.

Example #1

Example #2

Newton’s First Law Definition: An object in motion stays in motion or an object at rest stays at rest until an unbalanced net force acts on it.