Forces FORCEMAN.

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Presentation transcript:

Forces FORCEMAN

What causes things to move? What is a force? A push or a pull that one body exerts on another.

Balanced

Question: Can there be balanced forces on a object and the object still have motion?

The Body will Accelerate Unbalanced If the forces acting on a body are "unbalanced" this means that there is a "net" or "resultant" force. The object will do one of the following: Speed Up Slow Down Change the Direction of its Motion In other words…. The Body will Accelerate

What will happen? Abruptly stopping a cart with a suitcase on top…. You set your coffee cup on the dash and then make a sharp left turn….. You throw a tennis ball in outer space.

Forces that oppose motion

Friction

Forces that oppose motion -Friction is a force that opposes motion between two surfaces that are touching each other. Friction Song 1 Friction Song 2 Acts in the opposite direction of the motion

-Air resistance is the force air exerts on a moving object Forces that oppose motion -Air resistance is the force air exerts on a moving object

Friction What Causes Friction? Microscopic, electrostatic interactions between contacting surfaces Friction

Types of Friction Static Friction Sliding Friction Rolling Friction

Types of Friction 1. Static friction is the force between two surfaces in contact that keeps them from sliding when a force is applied.

Static friction- occurs between the surfaces of 2 objects that touch but do not move against each other. Static friction must be overcome for one of the objects to move.

Static Friction (FS)

Not enough static friction

2. Sliding – force required to keep an object sliding at a constant speed 3. Rolling – force required to keep an object rolling at a constant speed To decrease friction, surfaces can be lubricated with a liquid such as oil.

Friction Song