Forces Objectives: Students will be able to define the four major types of forces in the universe Students will be able to identify a balanced and an unbalanced.

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Presentation transcript:

Forces Objectives: Students will be able to define the four major types of forces in the universe Students will be able to identify a balanced and an unbalanced force using description and numbers Students will recognize that a force causes any object to accelerate Students will define the units of force as Newtons or N. Students will use the word “inertia” to describe the behavior of objects both at rest and in motion.

Forces Definition: A force is a push or a pull that acts on an object. A force can cause a resting object to move, or it can accelerate a moving object by changing its speed or its direction.

Forces Forces are measured in Newtons (N).

What the heck is a Newton? A newton is the force that causes a 1 kg mass to accelerate at a rate of 1 m/s for every second. In other words, 1 N = 1 kg*m/s2 Rather than torture you with that long unit, we named the measurement after a crusty dead white guy – Issac Newton.

Representing Forces We represent forces with an ARROW!! Forces have a magnitude and a direction (they have a size and a direction). Forces are vector quantities.

Forces Forces are either balanced or unbalanced. When a force is balanced, there is NO ACCELERATION. We say the net force is zero. Unbalanced forces cause objects to accelerate.

The force of FRICTION… All moving objects are affected by friction. Static friction Sliding friction Fluid friction Rolling friction

The Law of Inertia (Demonstrations) AKA – Newton’s First Law EVERYTHING IN THIS UNIVERSE IS LAZY!!!!!! Nothing moves unless it has to – and if it’s already moving, it doesn’t want to stop!!

INERTIA and Newton’s First Law An object in motion has a tendency to stay in motion and an object at rest has a tendency to stay at rest unless acted on by an outside force.