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Falling Cats: using physics to resolve an apparent biological paradox Some rights reserved: 1© J. A. Bolker and D. C. Meredith, UNH, 2009
Cats who fall >7 stories survive… Better than humans who fall the same distance; and Better than cats falling <7 stories! WHY? Diamond, J How cats survive falls from New York skyscrapers. Natural History 98:20-26 Data are based on veterinary records of accidental falls - not deliberate defenestration of felines. 2© J. A. Bolker and D. C. Meredith, UNH, 2009
Explanation = physics: How hard you hit depends on how fast you are going…which depends on (a) your mass, and g; (b) how long you have been accelerating and (c) your maximum possible falling speed (a.k.a. terminal velocity). terminal velocity is lower for cats; they reach it sooner; and once they do, they adjust their behavior. 4© J. A. Bolker and D. C. Meredith, UNH, 2009
Predators, prey, and physics: the distinction between v and a can be a life or death matter…. 1© J.
Physics and Astronomy Outreach Program at the University of British Columbia Physics and Astronomy Outreach Program at the University of British Columbia.
1. The speed of sound in air is 330m/s. In one hour sound could travel a distance of: A. 620 mi B. 743 mi C. 810 mi D mi.
Which object - the elephant or the feather - will hit the ground first? The elephant encounters a smaller force of air resistance than the feather and.
2_5 Falling Objects Force = mass x ___________ Speed = _______ time Velocity is _______ in a given _________ Acceleration = ________________ time 13 March.
Freefall Motion Notes Any object near the surface of the Earth experiences the pull of gravity. If released from rest, the object will fall freely toward.
Neglecting air resistance, all objects fall at a rate of 9.8 m/s 2 due to gravity Because objects fall in a downward direction, we’ll call their acceleration.
GRAVITY: pages GRAVITY IS EVERYWHERE!. A. GRAVITY = The FORCE of ATTRACTION between ANY two objects All matter (anything that has mass) has gravity…but.
4.3 Free Fall and the Acceleration due to Gravity.
In most situations, at least two forces act on any object. The overall effect of these forces makes it act differently. For example, if a falling object.
© Oxford University Press b Terminal velocity At first the parachutist accelerates at 10m/s 2 due to gravity.
Notes: Forces Big “G” and little “g” Newton’s Law of Universal Gravity -F g, the force of attraction between two objects is directly proportional to the.
Calculating g: Part II Dropping Pumpkins from the Stadium! Review: Freefall Lab: Calculating g Wrapping Up…
Objects that fall under the influence of gravity and are heavy enough to neglect air resistance.
Chapter 2.2 Objectives and Vocabulary acceleration deceleration Newton's second law Define and calculate acceleration. Explain the relationship between.
Terminal velocity Weight Falling Air resistance Terminal velocity Questions.
GRAVITY: Ch 12. Sec. 2 pages GRAVITY IS EVERYWHERE!
Newton’s 2nd Law of Motion F=ma. units Multiple forces can be exerted on an object at the same time.
Notes on Motion VI Free Fall A Special type of uniform acceleration.
Gravity and Air Resistance. Free Fall When falling the only force acting on an object is gravity Type of force when in free fall: unbalanced force Objects.
Newton’s 2 nd Law of Motion Ch 3 Sect 1. Review Speed Definition Velocity Definition Acceleration Definition Mass Definition Force Definition.
CH 10 Section 2 Notes Forces - Terminal Velocity Objectives: By the end of this presentation, you should be able to: Describe and explain what is meant.
A 9.0 kg object hangs on a string that can have a maximum tension of 275 N. What is the shortest time you could raise the object from rest a distance of.
What’s the hurry? The Kinematics of Freefall.
Projectile Motion Notes and Practice Vocabulary Projectile Trajectory Gravity Acceleration due to gravity (g) Terminal Velocity Horizontal Component.
SECTION 1 (PART 3) – Falling Objects. AIR RESISTANCE When an object falls, gravity pulls it down. Air resistance works opposite of gravity and opposes.
JEOPARDY Force and motion. Force Motion 2 Motion 2 Newton’s Laws Newton’s Laws of Motion of Motion Newton’s Laws Newton’s Laws of Motion 2 of Motion 2.
1. What distance will a train stop in if its initial velocity is 23 m/s and its acceleration is m/s/s? 1058 m xvivfatxvivfat.
Section 2.3 Gravity and Free Fall. Acceleration due to Gravity ► ► An object is in free fall if it is accelerating due to the force of gravity and no.
Free Fall The acceleration of gravity (g) for objects in free fall at the earth's surface is 9.8 m/s 2. Galileo found that all things fall at the same.
Time (s)012 Mass of car & bucket (kg) Mass of falling bucket (kg) Force of falling bucket (F = m x a (earth) ) (N) Acceleration of the system ( F = m.
Newton’s Second Law of Motion You will be learning: 1.Newton’s Second Law of Motion. 2.Three types of friction. 3. The effects of air resistance on falling.
Acceleration Formulas. Formulas ∆ v = a ∆t change in v ~ time (uniform acceleration) v 2 − v 1 = a (t 2 − t 1 ) (time when) v 2 = v 1 + at (elapsed time)
Forces : Terminal velocity and stopping distance.
Definition: Acceleration Vector quantity: magnitude (value) & direction Rate at which an object changes its velocity. “How fast an object is getting faster”
Newton’s Second Law Speed Velocity Acceleration Distance traveled in a given amount of time – km/ h The speed of an object in a particular direction –
What would happen if you jumped into a well that went all the way through Earth? See answer in video.
Lecture 11: Laws of motion. Newton’s 1 st Law: Inertia Matter resists motion If at rest, it will stay at rest If in motion, it will stay in motion Mass.
MTH 251 – Differential Calculus Chapter 3 – Differentiation Section 3.4 The Derivative as a Rate of Change Copyright © 2010 by Ron Wallace, all rights.
Free Fall Lab Physics Created by K.Rick. Essential Question: What may be gained by understanding the effect that gravity has on motion?
Free Fall and Terminal Velocity CH4 Physics A Winter,
FORCES THAT OPPOSE MOTION ITS NOT JUST SCIENCE FRICTION.
In pairs can you CAREFULLY go through the exam. Can you then write in your book the title 5 Things I have learnt from the exam and then list 5 things you.
1 Which line shows a speed that gets faster & faster? VELOCITY A B C D E. None of the above.
Unit 2-4: Gravity. Free Fall The classic story of physics is the story of Sir Isaac Newton and the Apple. –As the story goes, Newton is working on his.
Projectiles Horizontal Projection Horizontally: Vertically: Vertical acceleration g 9.8 To investigate the motion of a projectile, its horizontal and.
Free Fall = Vertical Velocity = Vertical Velocity An object falling free of all restraints An object falling free of all restraints No friction No friction.
Ahhh! I’m falling Free Fall and Physics. Free Fall 3 IMPORTANT things to remember – We are ignoring fiction. – The object’s mass or shape doesn’t matter.
Friction and Gravity. 1. What is friction? The force that two surfaces exert on each other when they rub against each other.
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