Newtons First Law of Motion Inertia the tendency

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