Two types of Friction: Kinetic FrictionKinetic Friction Static FrictionStatic Friction 5.4 Friction.

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Presentation transcript:

Two types of Friction: Kinetic FrictionKinetic Friction Static FrictionStatic Friction 5.4 Friction

Kinetic friction is the frictional force between two surfaces that are moving along each other.Kinetic friction is the frictional force between two surfaces that are moving along each other. Kinetic friction acts on objects that are sliding on a surface.Kinetic friction acts on objects that are sliding on a surface. 5.4 Friction

Static friction is the frictional force between two surfaces that are not moving along each other.Static friction is the frictional force between two surfaces that are not moving along each other. Static friction keeps objects on inclines from sliding, and keeps objects from moving when a force is first applied.Static friction keeps objects on inclines from sliding, and keeps objects from moving when a force is first applied. 5.4 Friction

Newton’s third law: Whenever one object exerts a force on a second object, the second exerts an equal force in the opposite direction on the first. 6.1 Newton’s 3 rd law

A key to the correct application of the third law is that the forces are exerted on different objects. Make sure you don’t use them as if they were acting on the same object. 6.1 Newton’s 3 rd law

Rocket propulsion can also be explained using Newton’s third law: hot gases from combustion spew out of the tail of the rocket at high speeds. The reaction force is what propels the rocket. Note that the rocket does not need anything to “push” against. 6.1 Newton’s 3 rd law

Weight is the force exerted on an object by gravity. Close to the surface of the Earth, where the gravitational force is nearly constant, the weight is: 6.1 Newton’s 3 rd law

The normal force and the force of gravity are not action reaction force pairs because they act on the same object. 6.1 Newton’s 3 rd law

1. While driving, Anna Litical observed a bug striking the windshield of her car. Obviously, a case of Newton's third law of motion. The bug hit the windshield and the windshield hit the bug. Which of the two forces is greater: the force on the bug or the force on the windshield?

2. Rockets are unable to accelerate in space because... a.there is no air in space for the rockets to push off of. b.there is no gravity is in space. c.there is no air resistance in space. d.Nonsense! Rockets do accelerate in space.

3. A gun recoils when it is fired. The recoil is the result of action-reaction force pairs. As the gases from the gunpowder explosion expand, the gun pushes the bullet forwards and the bullet pushes the gun backwards. The acceleration of the recoiling gun is... a.greater than the acceleration of the bullet. b.smaller than the acceleration of the bullet. c.the same size as the acceleration of the bullet.