PHYS 221 EXAM 1 REVIEW SESSION Reminders NO

Exam Overview “Approximately 1/3 of the problems will stress understanding of the physics concepts,

Do you find yourself in any one of these situations? �Being chased by angry

THEN The sum of the forces on you are ZERO, and your acceleration is

Difference between Average and Instantaneous � Ball thrown in the air INSTANTANEOUS AVERAGE INSTANT

Throw Ball (or bomb) Straight Up � How does the velocity change? � How

Speed at top of trajectory � Equal to the horizontal component of velocity

Constant acceleration equations � REALLY USEFUL, but not used everywhere

�A particle moves with constant angular velocity 3 rad/s in a circle of 5

Centripetal Force � http: //www. youtube. com/watch? v=f. Sf. VV z 0 e. Iis

Normal Force � Is the normal force always equal to mg?

Inclined Plane � Know what’s going on. � What if you add friction?

Selected Problem: � Solve intuitively, or exactly

Work Basics � When is it positive? � When is it negative?

Work done by gravity � What is the work done by gravity on a

Power � What is the power as an object moves 10 m under a

What is your SI Leader’s name? 1. 2. 3. 4. 5. 6. 7. Jacob

Slides: 52

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PHYS 221 EXAM 1 REVIEW SESSION

Reminders: � NO SI THURSDAY!!

Exam Overview “Approximately 1/3 of the problems will stress understanding of the physics concepts, whereas the remainder will be numerical problems to test ability to apply these concepts. ” -Syllabus 27 Questions

Don’t be tricked!

Breakdown �

Do you find yourself in any one of these situations? �Being chased by angry killer bees and running from them at constant speed � Swimming in an ironman triathlon at constant speed �Giving someone a piggy back ride at constant speed �Lying in bed on a Saturday morning (at constant speed)

THEN The sum of the forces on you are ZERO, and your acceleration is ZERO.

2: B 3: C 16. E 17. C

Position, Velocity, Acceleration �

Difference between Average and Instantaneous � Ball thrown in the air INSTANTANEOUS AVERAGE INSTANT INTERVAL

Here, take this: Position �

Here, take this: Velocity �

Here, take this: Acceleration �

Throw Ball (or bomb) Straight Up � How does the velocity change? � How does the acceleration change?

Our friend projectile motion

Speed at top of trajectory � Equal to the horizontal component of velocity

Constant acceleration equations � REALLY USEFUL, but not used everywhere

Relative Motion

Position, Velocity, Acceleration �

�A particle moves with constant angular velocity 3 rad/s in a circle of 5 m. What is the centripetal acceleration, and the velocity?

These above are VECTORS!!!

Centripetal Force � http: //www. youtube. com/watch? v=f. Sf. VV z 0 e. Iis

Position, Velocity, Acceleration �

F=ma

Normal Force � Is the normal force always equal to mg?

Friction

Mass-Force Problems

Newton’s 3 rd Law

Your turn

Inclined Plane � Know what’s going on. � What if you add friction?

Selected Problem: � Solve intuitively, or exactly

Work Basics � When is it positive? � When is it negative?

Work done by gravity � What is the work done by gravity on a 5 kg block starting from rest as it moves downward 10 m? � What is its speed at that time?

Work

Spring �