Terminal Velocity, Weight & Area

Slides:

Advertisements

Similar presentations

IV. Force & Acceleration

Advertisements

Forces act in pairs.

Resistive (Drag) Forces

Terminal velocity Weight Falling Air resistance Terminal velocity Questions.

FORCE Chapter 10 Text. Force A push or a pull in a certain direction SI Unit = Newton (N)

Bellringer Answer the following two questions in complete sentences.

Dynamics of a skydiver --Effects of air drag. Drag force in gases and liquids Drag force increases with velocity D= c A v^2 (in a MP problem, D=Kv^2 so.

Phy 211: General Physics I Chapter 6: Force & Motion II Lecture Notes.

Circular Motion and Other Applications of Newton’s Laws

Motion of mass on a parachute  Falling objects increase their speed as they fall.  This is due to their weight (the force of gravity) that pulls them.

 Calculate the acceleration that this object experiences 30 kg 150 N.

Mrs. Wharton’s Science Class

Forces Ch. 6 Milbank High School. Sec 6.1 Force and Motion ► Objectives  Define a force and differentiate between contact forces and long-range forces.

Chapter N6 Linearly Constrained Motion N6B.1, B.4, B.5, S.1, S.8 Due Monday.

Unit 2 Forces & Motion.

Terminal Velocity D. Crowley, 2008.

The Force of Gravity. Gravity Gravity- the force that pulls objects towards the Earth Free fall- when the only force acting on an object is gravity –

Terminal Velocity Jason Day. What is Terminal Velocity According to dictionary.com it is: the velocity of a falling object/body through a medium(in this.

Drag force Terminal velocity.  We’re always “neglecting air resistance” in physics ◦ Can be difficult to deal with  However air resistance is present.

Parachute Investigation. Velocity Definition: The constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity.

Chapter 6 Circular Motion and Other Applications of Newton’s Laws.

Forces and Equilibrium. Fluid Resistance or Drag Force Fluid resistance or air resistance is a force in the opposite direction of the object’s motion.

 Extension of Circular Motion & Newton’s Laws Chapter 6 Mrs. Warren Kings High School.

Page 81 (Ch ) 6. The bowling ball moves without acceleration because there is no net force on the ball (neglecting friction) 7.Neglecting air resistance,

4-4: Everyday Forces Objectives: Explain the difference between mass and weight Find the direction and magnitude of the normal force Describe air resistance.

Fluid Resistance.

Unit 3 Forces & Motion. Forces Force- an action applied to an object to change its motion(push or pull) Units of lb, N (equal to kg. m/sec 2 ) If forces.

Unit 1 Physics on the go Topic 2 Materials: Viscosity.

Friction and Gravity. 1. What is friction? The force that two surfaces exert on each other when they rub against each other.

Unit 2 Forces & Motion. Forces Force- Ability to change motion(push or pull) Units of lb, N=kg. m/sec 2 If forces are balanced then the object won’t move.

1 Honors Physics 1 Class 05 Fall 2013 Newton’s Laws Applications.

Forces due to Friction Friction: A force between the contacted surfaces of two objects that resists motion. If an object is not moving, that does not.

1 Forces Laws of Motion. 2 Newton’s First Law of Motion An object at rest remains at rest and an object in motion maintains its velocity unless it experiences.

Physics Section 4.4 Describe various types of forces Weight is a measure of the gravitational force exerted on an object. It depends upon the objects.

What is the deal with friction?. Friction Force that opposes the motion of objects that touch as they move past each other. 4 types of friction –Static.

2_5 Falling Objects Force = mass x ___________ Speed = _______ time Velocity is _______ in a given _________ Acceleration = ________________ time 13 March.

Physics Section 4.4 Describe various types of forces Weight is a measure of the gravitational force exerted on an object. It depends upon the objects.

Friction! Recall, Friction is a force that opposes all motion. Friction is the result of contact between 2 surfaces. The “Normal force” is the force that.

Chapter 13, Section 2 Gravity and Motion

PHY 151: Lecture Extending Particle in Uniform Circular Motion Model (Continued) 6.4 Nonuniform Circular Motion 6.5 Motion in Accelerated Frames.

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.

Acceleration & Force Section 8.2.

FORCES CH. 2. What is a Force? Def: a push or a pull –Measured in Newtons Kg · m/s 2 –Balanced Force – an equal but opposite force acting on an object.

Gravitational Force  Gravity= a force of attraction between objects, “pulls” objects toward each other  Law of universal gravitation= all objects in.

“Law of Acceleration” Forces can be BALANCED or UNBALANCED Balanced forces are equal in size (magnitude) and opposite in direction UNbalanced.

The Nature of Force and Motion 1.Force – A push or a pull – How strong it is and in what direction? 2.Net Force – The sum of all forces acting on an object.

IV. Force & Acceleration

Terminal Velocity D. Crowley, 2008.

Force & Acceleration Motion & Forces Newton’s Second Law Gravity

©2008 by W.H. Freeman and Company

The Nature of Forces.

IV. Force & Acceleration

Motion & Forces Forces & Acceleration Newton’s 2nd Law Gravity

Aim: How do we explain air resistance?

Chapter 13, Section 2 Gravity and Motion

IV. Force & Acceleration

IV. Force & Acceleration

Mass and Weight This is the amount of matter. (Kg)

Chapter 13, Section 2 Gravity and Motion

LAW OF FALLING BODIES.

Aim: How do we explain air resistance?

Problems Involving Drag

Terminal Velocity D. Crowley, 2008.

IV. Force & Acceleration

Chapter 13, Section 2 Gravity and Motion

Force & Acceleration Motion & Forces Newton’s Second Law Gravity

Chapter 13, Section 2 Gravity and Motion

IV. Force & Acceleration

Presentation transcript:

Terminal Velocity, Weight & Area

As v increases, so does air friction…

…until F = W-f =0. Now a=0, and the maximum or “terminal” velocity is achieved

Curveballs

Lab: Coffee Filter, Air Drag & Terminal Velocity with Motion Detector

Ailerons

Motion in the presence of resistive forces Motion in viscous media.

Objects interact with the medium through which they are moving. Air Water, oil, liquids. The resistive forces depend on the speed of the object. F ~ v: Objects falling in liquid, tiny objects falling in air. F ~ v2: Large objects moving in air.

Terminal velocity. When the resistive force of the falling object is equal to the gravitational force on the object. Examples: - skydivers soap bubbles falling in air small spheres dropping in liquid.

Air drag at high speeds. For objects moving at high speeds through air: Resistive force: Where: D… Drag coefficient of object (depends on shape) r…density of air A… cross-sectional area of object v… velocity of object

Example CC Sabathia fires a baseball (m = 0.145 kg) past you at 100 miles/hr (45 m/s). Calculate the resistive force acting on the ball at that speed. D… Drag coefficient = 0.284 r…density of air = 1.29 kg/m3 r… radius of baseball = 0.037 m v… velocity of object

Air Drag a.k.a. Fluid Drag Fluid friction = ½ CAv2 @ V terminal, F = W – f = 0 Solve for v: mg - ½ CAv2 = 0 V terminal = (2mg/ CA)½

©2008 by W.H. Freeman and Company Drag Forces This chute is called a drag chute, but not directly for same reason as car is called drag racer. ©2008 by W.H. Freeman and Company

What factors influence drag? Shape of the object. Cars and planes are given aerodynamic shape to reduce drag. Properties of the fluid. Denser fluids increase drag. Speed of the object relative to the fluid.

Terminal Velocity Because the drag force increases with increasing velocity, an object in free fall will reach a speed where the drag force balances the force of gravity. This speed is called terminal velocity.

Terminal Velocity At terminal velocity

Getting to Terminal Velocity Because the drag force depends on velocity, at first the drag force is small and the motion is like free fall. At terminal velocity the velocity is constant. The graph is exponential growth.

Getting to Terminal Velocity