2 To do…Friday Answers for first test Questions on Homework handout Class example problemHand in the graph created by you walking before the motion detector with the analysisTalk about the causes of motion
3 To do Monday Hand in Handout #3 Hand in Graph work Divide up, calculate velocity, calculate acceleration, determine overall velocityForces- general informationForces –laws of motionForces- free body diagramHomework #4Test thursday
4 Any questions on the homework handout? Results are due on Monday,if needed
5 New homework 3 more question on Handout #4 Grade old homework and pass back tomorrowTest on Friday (primarily constant acceleration problems and review)
6 Do Now problem Joe runs with a constant velocity of 5.4 m/s for 20 s before he reaches a pile of leaves. It takes 1.5 s for Joe to come to a stop in the pile. What is his rate of acceleration in the leaf pile and how far did Joe travel overall?
8 What causes objects to move or change their motion?
9 Forces Contact (applied) Forces Non-contact Forces Electromagnetic forces (most common)Non-contact ForcesGravitational (most common)FieldsAnything that pushes or pulls is a forceUnits in Newtons (for this class)
10 Weight is a Force Force due to the pull of gravity Weight (W) = mass X acceleration due to gravityOn earth, everything in free-fall accelerates at the same rate (9.8 m/s2) towards Earth
11 Demonstration that all objects are pulled at the same rate Paper and bookPaper-vs-paperThe only reason why things do not fall at sam rate is air resistance
12 Determine your weight in Newtons Take you weight in lbs and divide by 2.2The 1st action converts from lbs kgKg is the common unit for MassMass is the amount of stuff that makes up an object
13 Mass is the measure of the inertia of an object Inertia = the amount resistance to change in motionThe object that is the most massive, changes its velocity the least when a constant force is appliedGolf, Magic Tricks
14 Difference between mass and weight Mass = measure of the amount of matter that makes up an objectWeight is the amount of Force generated due to the pull of gravity
15 To find your weight in Newtons Weight = mass x 9.89.8 = acceleration due to gravity on earthChange the location (moon, into space, on Jupiter): Change the acceleration valueMoon 1/6th of earth = 1.67Jupiter about 2.5 times Earth = 25