CP physics

Good 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 Wall

2. Cheat Sheet: you cannot have sample problems done out

3. Review notes & questions

4. Projectile motion review

5. Review activity

Reminders:

1. RE-taking your HOT Task? Come after school, check with me a date that works for you

1. Last day: WEDNESDAY THIS week

• Look over all old tests & know how to do every problem

• Go over your notes from each unit – be familiar with concepts

• Re-do problems from the homework & problems from the review sheet

Format:

• 30 multiple choice

• 14-15 problems with multiple parts

1. Conversion, measurement, precision, accuracy

2. One-dimensional motion: constant speed

3. One-dimensional motion: accelerated motion

4. Free-fall motion

5. Vectors

6. Projectile motion

7. Forces & Newton’s laws

Midterm topics

Topics Suggested Study Techniques

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

2. One-dimensional motion: constant speed

• Graphing motion

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?

Mg = 10 N

FN = 10 N

Fa = 1 NFf = 3 N

Mg = 10 N

FN = 10 N

Fa = 5 NFf = 3 N

Mg = 10 N

FN = 10 N

Fa = 3 NFf = 3 N

Jeopardy

1. Conversions, Measurement

2, 3, 4. 1D motion: Constant speed, acceleration, free-fall

5, 6. Vectors & projectile motion

7. Forces & Newton’s laws

100 100100

100

200 200 200 200

300 300300 300

400400 400 400