Day 23 b-cp-midterm review pt1Presentation Transcript
CP physicsGood morning! Please…• Take your cheat sheets, to be checked• Answer the warm-up question: – A baseball is thrown straight down from a building that is 65 meters tall from rest. What will its velocity be right before it hits the ground?
agenda:1. Word Wall2. Cheat Sheet: you cannot have sample problems done out3. Review notes & questions4. Projectile motion review5. Review activityReminders:1. RE-taking your HOT Task? Come after school, check with me a date that works for you 1. Last day: WEDNESDAY THIS week
Midterm topicsTopics Suggested Study Techniques 1. Conversion, measurement, • Look over all old tests & know precision, accuracy how to do every problem • Go over your notes from each 2. One-dimensional motion: unit – be familiar with concepts constant speed • Re-do problems from the 3. One-dimensional motion: homework & problems from the accelerated motion review sheet 4. Free-fall motion Format: 5. Vectors • 30 multiple choice • 14-15 problems with multiple 6. Projectile motion parts 7. Forces & Newton’s laws
1. Conversion, measurement, precision, accuracy• Using factor label method to convert numbers• What are some examples of SI units used in physics? English units?• What are the significant figures for the following two numbers: – 0.02003 54300• What is precision? What is accuracy?• How to convert between metric units – Know kilo- to milli-
2 & 3. One-dimensional motion: constant speed & Acceleration• Graphing motion – Identifying the information given on an x vs. t, v vs. t, a vs. t graph • Slope of the lines on the graphs • Area under the curve• Solving problems using one-dimensional motion equations
4. free-fall motion• The acceleration of an object in free-fall• Using motion equations to solve free-fall problems: – An object dropped from rest – An object dropped with an initial velocity
4. free-fall motion• Sample problem: a ball is dropped with an initial velocity of 12.0 m/s. – What will be the velocity of the ball after 2.0 seconds? – If it takes 5.5 seconds for the ball to hit the ground, how tall is the building? -31.6 m/s
5. vectors• Difference between scalar and vector quantities – What are some examples of each?• Breaking vector into its components• Solving for resultant vectors by adding or subtracting two vectors that are at a right angle to one another.
5. Vectors• Draw the following vectors: – 5 meters at 30 degrees south of west – 10 meters at 25 degrees east of south
6. Projectile motion• Concepts behind projectile motion – Projectile motion is anything that has an initial horizontal velocity that is under the influence of free-fall – X & y dimensions of motion are completely independent of one another • What happens in the x-direction? • What happens in the y-direction?• What is range? At what angle does any object have maximum range?• Problems with initial horizontal velocity• Problems with projectiles launched at an angle.
7. Forces• Newton’s laws and how they apply in various situations – What is Newton’s first law? Second law? Third?• Drawing free-body diagram• Problems with friction on an inclined plane• Problems with friction on a level surface• Calculating coefficients of kinetic and static friction.
7. Forces• A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 185 N so that the box moves with a constant velocity. If the mass of the books is 35.0 kg, calculate the coefficient of kinetic friction between the box and floor.
7. Forces • What is the net force on each object? FN = 10 NFf = 3 N Fa = 5 N Mg = 10 N FN = 10 N FN = 10 N Ff = 3 N Fa = 1 N Ff = 3 N Fa = 3 N Mg = 10 N Mg = 10 N