final review jerika mckeon. announcements all assignments (late work, extra credit) are due tonight...

FINAL REVIEWJERIKA MCKEON

ANNOUNCEMENTS

All assignments (late work, extra credit) are due TONIGHT at 11:59pm!!!

Check the NO CID box!!!

Check your grades online!!!

DO YOU KNOW ANYONE TAKING 105 OR 106 NEXT SEMESTER?

I’m available for tutoring!

Contact me at jmnewitt@yahoo.com for more information.

STUDY TIPS• Look at a question conceptually first, then look to see if

your calculated answer agrees.

• Check units

• Ask “What if?” questions.

• What if there was friction?• What if I was given different values?• What if I was asked to solve for something different?• What if a given value was bigger/smaller?

PROBLEM BREAKDOWN• Unit 1: 10 problems (4 worked & 6 conceptual)

• 2 problems from Exam 1 that were NOT on Exam 2• Unit 2: 7 problems (4 worked & 3 conceptual)

• 2 problems from exam 2 that WERE on Exam 3• Unit 3: 8 problems (4 worked & 4 conceptual)

• 2 problems from Exam 3• Post Unit 3: 8 problems (5 worked & 3 conceptual)

• 33 total problems

UNIT 1: KINEMATICS & FORCES

10 PROBLEMS

UNIT 1- KINEMATICS• Basic Vocabulary

• Distance vs Displacement• Speed vs Velocity• Acceleration• Scalars vs Vectors• Instantaneous vs Average

• 1D Kinematics

• Trig

• 2D Vectors (relative velocity)

• 2D Kinematics

UNIT 1- KINEMATICS PRACTICE PROBLEMI drive 2 miles North to the grocery store. Then I drive 1 mile East to the post office and then I drive home. The entire time I travel at 45 mph.

What is my total distance traveled?

What is my total displacement traveled?

What is my instantaneous speed while I am driving to the grocery store?

What is my instantaneous velocity while I am driving to the grocery store?

What is my average speed for the whole trip?

What is my average velocity for the whole trip?

What is my average acceleration for the whole trip?

UNIT 1- KINEMATICSPRACTICE PROBLEM

A bullet is shot at a 30° angle. When the bullet is rising, what direction is it accelerating?

a) Up

b) Down

c) Not accelerating

While the bullet is falling, what direction is it accelerating?

While the bullet is at the top of its path, in what direction is it accelerating?

UNIT 1- KINEMATICS PRACTICE PROBLEM

A baseball is hit at an upward angle across a flat field. The baseball is hit 1 meter above the ground and lands some distance away.

At what part of its path does the ball have its maximum speed?

a) Right after it leaves the batter’s handb) Halfway to the topc) At the top of its pathd) Halfway from the top to the grounde) Right before it hits the groundf) There’s not enough information to say

At what part of its path does the ball have its minimum speed?

UNIT 1- KINEMATICS PRACTICE PROBLEM

A ball is shot horizontally from a table at the same time as another ball is dropped from the same height. Which ball hits the ground first?

a) The one shot horizontally

b) The one that was dropped

c) Same time

UNIT 1- NEWTON’S LAWS• 1st Law: Objects have constant velocity unless acted on by

unbalanced forces

• 2nd Law: F=ma

• 3rd Law: Force Pairs

• Know how to use them in problems

UNIT 1- FORCES• Typical Forces

• Fg=Weight• N• Ff• T

• Other Stuff

• Using Kinematics• Ropes & Pulleys (2 Body Systems)• Inclined Planes• Centripetal Force• Newton’s Laws of Gravity• Impulse

UNIT 1- FORCES PRACTICE PROBLEM

The work done by static friction is always:

a) Positive

b) Negative

c) Parallel to the surface

d) Perpendicular to the surface

e) Zero

UNIT 1- FORCES PRACTICE PROBLEM

A toy car on a ramp is given a quick upward push. As a result of the push, the car travels up the ramp, slows down and stops, then rolls back down again.

As the car moves up the ramp, the net force on it is:

a) Up the ramp and increasing in magnitudeb) Up the ramp and decreasing in magnitudec) Up the ramp and constant in magnituded) Down the ramp and increasing in magnitudee) Down the ramp and decreasing in magnitudef) Down the ramp and constant in magnitudeg) Zero

Right at the top of the car’s motion, the net force on it is ___.

As the car moves down the ramp, the net force on it is _____.

UNIT 2: ENERGY, MOMENTUM, ROTATION

7 PROBLEMS

UNIT 2- ENERGY, WORK, POWER• Work = Fd (What direction does that force have to be?)

• Types of Energy

• Translational Kinetic Energy• Rotational Kinetic Energy• Gravitational Potential Energy• Spring Potential Energy

• Conservation of Energy

• When is energy conserved?• Elastic vs Inelastic Collisions• 1D & 2D

UNIT 2- MOMENTUM• When is momentum conserved?

• 1D & 2D Collisions

• Multi-Step Collisions (bullet into block)

UNIT 2- MOMENTUM

Suppose a little boy is floating in outer space with no forces acting on it. The boy is at rest, so its momentum is zero. Suddenly, the boy pulls out a pvc pipe and blows a marshmallow out of one end. The marshmallow goes one way and the boy goes the other way. Was the momentum of the “boy and marshmallow” system conserved?

a) Yes

b) no

UNIT 2- ANGULAR KINEMATICS• Kinematic Equations are the same as for linear kinematics

• s=θ*r (arc length)

• ω=v*r (angular velocity)

• α=a*r (angular acceleration)

UNIT 2- TORQUE

• Equilibrium Problems

UNIT 2- ANGULAR MOMENTUM• p=m*v

• L=I*ω

• Hidden angular momentum=r*p (radius has to be perpendicular to linear momentum)

UNIT 1- KINEMATICS PRACTICE PROBLEM

Captain America can throw his 10kg shield with a velocity of 10m/s at 30°. How far does the shield travel? Would it travel further or not as far if the shield weighed 10kg?

UNIT 1- NEWTON’S LAWS PRACTICE PROBLEM

If a dog weighs 30kg, what is the force of the floor on him when he is on Earth?

What would a bathroom scale read when he is on a planet with half of the acceleration due to gravity than Earth has?

UNIT 1- FORCES PRACTICE PROBLEM

A force F is applied to a crate on an incline so that he crate does not slide. The angle of the incline is 35°.

If the minimum force F that has to be applied is 35N, what is the coefficient of friction that is needed to keep the crate from slipping? What type of friction is it?

UNIT 1- FORCES PRACTICE PROBLEM

Superman can kick a 2kg soccer ball at 100m/s. It takes 0.05s for him to kick the ball. What force does he exert on the ball? What is the ball’s acceleration?