Newton’s Second LawNewton’s Second Law

Section 3-1Section 3-1

Force and AccelerationForce and Acceleration

The greater the force is that is The greater the force is that is applied to an object, applied to an object,

F=F=

Force and MassForce and Mass

The acceleration of an object The acceleration of an object depends on its as well as the depends on its as well as the exerted on it exerted on it

Throw a baseball and a softball Throw a baseball and a softball F=F=

Newton’s Second LawNewton’s Second Law

F =F = The net force acting on an object The net force acting on an object

causes the object to in causes the object to in the direction of the force.the direction of the force.

Force will be labeled in Force will be labeled in

– Mass = kgMass = kg– Acceleration = m/sAcceleration = m/s22

You are pushing a friend on a You are pushing a friend on a sled. You push with a force of sled. You push with a force of 40 newtons. Your friend and 40 newtons. Your friend and the sled together have a mass the sled together have a mass of 80kg. What is the of 80kg. What is the acceleration of your friend on acceleration of your friend on the sled?the sled?

A tennis ball undergoes an A tennis ball undergoes an acceleration of 5,500m/sacceleration of 5,500m/s22. How . How much force would the tennis racket much force would the tennis racket have to exert to give the ball this have to exert to give the ball this acceleration? The ball has a mass acceleration? The ball has a mass of .06kg.of .06kg.

FrictionFriction

Force thatForce that

What happens to a skate board What happens to a skate board after you give it a push?after you give it a push?

Why does it slow down and Why does it slow down and eventually stop?eventually stop?

Would the type of surface make a Would the type of surface make a difference?difference?

Amount of FrictionAmount of Friction

The amount of friction depends The amount of friction depends on two things.on two things.– –

Three types of FrictionThree types of Friction

Static FrictionStatic Friction

The friction The friction

Getting the object movingGetting the object moving

Sliding FrictionSliding Friction

Force thatForce that

– Once you have the object moving, Once you have the object moving, there is still friction.there is still friction.

Rolling FrictionRolling Friction

The friction between The friction between

– Put sand on the ice when your car is Put sand on the ice when your car is stuck.stuck.

– Usually much less than static or Usually much less than static or sliding friction.sliding friction.

Air ResistanceAir Resistance

Force that acts Force that acts

Crumpled paper VS Flat paperCrumpled paper VS Flat paper Surface AreaSurface Area Air Resistance depends on:Air Resistance depends on:

– – –

Terminal VelocityTerminal Velocity

The that a The that a falling object can reach.falling object can reach.

The point where the forces acting The point where the forces acting on the object areon the object are