Newton’s First Law of Motion

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Chapter 11: Force and Newton’s Laws

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Presentation transcript:

Newton’s First Law of Motion Inertia- the tendency of an object to resist change. The greater the mass the greater the inertia!

Force Force- Push or a pull on an object Object speeds up, slows down, or turns from force More than one force can act on an object at the same time Net Force- Combination of all the forces acting on an object. Force= Mass X Acceleration

Balanced and Unbalanced Forces Balanced Forces- Two or more forces exerted on an object that cancel each other and do not change object’s velocity Net force is zero Unbalanced Forces- Effects of the forces don’t cancel and the object’s velocity changes Net force is not zero

Newton’s First Law of Motion Isaac Newton (1642-1727)- Explained motion of objects in 3 laws of motion Newton’s First Law of Motion- An object at rest will stay at rest, an object in motion at constant velocity will continue at a constant velocity unless acted upon by an unbalanced force.

Friction Friction- Force that acts to resist sliding between two touching surfaces. Ex: Acts on objects moving through air or water

Friction Static Friction- Type of friction that prevents an object from moving when force is applied. (object at rest) Caused by attraction of atoms on the two surfaces that are in contact

Friction Sliding Friction- Type of friction that is due to the roughness of the two objects. Slows down object that slides

Friction Rolling Friction- Occurs when an object rolls across a surface Rolling friction is less than sliding friction