Prompt under the document camera Thursday, March 2, 2017 Day 1 1. Please have these Items on your desk. Agenda Science Starter Sheet Note book Distance Displacement WS 2- Science Starter: Prompt under the document camera

Table of contents update . . . Pg. 43 3/2 Newton's Second law

Newton’s Second Law of Motion How fast does it go?

Acceleration An unbalanced force causes something to accelerate.

Acceleration Acceleration is directly related to the size of the force and the direction of the force. It accelerates in the direction you push or pull it.

In other words…. Large Force = Large Acceleration F a

So….if you push twice as hard, it accelerates twice as much. In other words…. Small Force = Small Acceleration F a So….if you push twice as hard, it accelerates twice as much.

But there is a twist…. Acceleration is INVERSELY related to the mass of the object.

In other words…..using the same amount of force…. Small acceleration a Large Mass Large acceleration F a Small Mass

Newton’s Second Law Newton, that brilliant genius, observed those “rules” of acceleration and came up with his second law of motion. It is both a formula & a law.

Newton’s Second Law The acceleration of an object is directly proportional to the net force & inversely proportional to it’s mass. F = ma Force = Mass x Acceleration

Okay then… First, you need to know the units of Force, Mass & Acceleration. The units used for force are Newtons (N) (kg/m/sec²) The units used for mass are kilograms (kg) The acceleration units are meters per second squared (m/sec²).

Force, Mass, Acceleration Force = Mass x Acceleration F= ma How much force is required to accelerate a 50 kg mass at 4 m/s2? F= ? F= 50 kg * 4 m/s² M= 50 kg A= 4 m/s² F= 200 N

What is the acceleration of a 7 kg mass being pulled by a 56 N force? A=f/m M= 7 kg 56N / 7 kg A= ? 8 m/s²

What is the mass of a block accelerating at 2 m/s2 and pushed by a 9 N force? M=f/a M= ? 9N / 2m/s² A = 2 m/s 4.5 kg