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Exploring Friction, Air Resistance, and Terminal Velocity: Understanding Forces in Motion

In today's lesson, students will delve into the fascinating concepts of friction, air resistance, and terminal velocity. They'll learn to compare different amounts of friction across various scenarios and define friction as the force opposing motion between surfaces in contact. Through engaging discussions and practical tests, students will explore static, sliding, and rolling friction, and discover how these forces impact everyday activities. The lesson will highlight how air resistance plays a crucial role in skydiving, leading to concepts like terminal velocity and safe landings.

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Exploring Friction, Air Resistance, and Terminal Velocity: Understanding Forces in Motion

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Presentation Transcript

  1. Tuesday January 31st Friction, Air Resistance, And Terminal Velocity!

  2. What will we learn today? • Content Objectives:Students will be able to compare amounts of friction in different scenarios • Literacy Objective: Students will be able to definefriction as the force that opposesthe motion of two surfaces that are in contact

  3. Yesterday… • …we talked about forces,free-body diagrams, and balanced/unbalanced forces. • And one student (Gabe) brought up an interesting idea… • …if we drag this block across the table… isn’t there friction that slows it down?? So don’t we need to add that to our free-body diagram?

  4. Friction • Friction is the force that opposesthemotion of two surfaces that are in contact • The size of the frictional force depends on: • The materials the surfaces are made from (how rough they are) • The force pushing the two surfaces together (more force = more friction!)

  5. A Closer Look at Friction

  6. Three Types of Friction • Static Friction: frictional force that prevents two surfaces in contact from sliding past each other • (there is no movement! The objects are static, defined as “fixed or stationary”) Balanced Forces means NO MOVEMENT Man’s force Frictional force

  7. Static Friction • Static Friction increases as the downward force increases • More downward force = more contact between the two rough surfaces = more friction. • Let’s test it out!

  8. Three Types of Friction • Sliding Friction: frictional force that acts in the opposite direction to the motion of a surface sliding on another surface • This time, there IS movement • Smaller than force due to Static Friction Unbalanced Forces means A CHANGE in velocity = movement! Man’s force Frictional force

  9. Three types of Friction • Rolling Friction: frictional force that acts in the opposite direction to the motion of a surface ROLLING over another surface • Smallest frictional force (of the three type)

  10. Let’s take a look at how POWERFUL friction can be… • http://www.youtube.com/watch?v=jSu0Tvlm6LY • http://www.youtube.com/watch?v=hOt-D_ee-JE

  11. Friction lets us… • Walk on the ground without slipping! • Rock Climb! • Stop a moving car! • Hold a Pencil • Wear Glasses or sunglasseswithout them falling off

  12. A Special Type of Friction • Air Resistance is a type of friction that opposes the motion of objects that move through the air • Without Air Resistance, all objects would fall at the same rate of speed • Parachutes significantly increase air resistance, allowing for a safe landing for skydivers!

  13. Skydivers • Reach a terminal velocity of 120 mph when laying “flat” and 150-200 mph when diving head-first • Terminal Velocity is when air resistanceequals the accelerating force of gravity and the object cannot go any faster. • After the parachute is deployed, air resistance significantly increases and skydivers decelerate to a rate of 18mph

  14. Lets see Air Resistance in Action: • http://www.youtube.com/watch?v=1_fcX1YiWIU • Balanced Forces: http://www.youtube.com/watch?v=Ays6luaS4r0

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