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Introduction to Applied Physics

Introduction to Applied Physics. Milbank High School . Mechanics. Newton’s Laws of Motion Kinematics Statics Dynamics. Kinematics. Branch of physics concerned with describing the motion of objects Velocity, time, distance, acceleration. Velocity.

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Introduction to Applied Physics

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  1. Introduction to Applied Physics Milbank High School

  2. Mechanics • Newton’s Laws of Motion • Kinematics • Statics • Dynamics

  3. Kinematics • Branch of physics concerned with describing the motion of objects • Velocity, time, distance, acceleration

  4. Velocity • Distance covered in a certain amount of time • V = d/t • Units will be in meters per second (m/s), miles per hour (mph), or other combinations of distance and time

  5. Examples • A baseball is thrown 60 meters in 2 seconds. What was the baseball’s velocity? • Your car covers 10 miles in 15 minutes. How fast is your car going in miles per hour?

  6. Distance • Distance can be calculated by taking velocity x time • d = vt

  7. Examples • A car is traveling 65 miles per hour. How far can the car travel in 6 hours? • You are riding your bike at a constant rate of 3 m/s. How far will you travel in 1 minute?

  8. Which cars are accelerating??

  9. Acceleration • The rate of change of velocity divided by time change • Usually m/s/s…..or m/s2

  10. Is the velocity constant?

  11. Force • How do forces influence motion? • Force– a push or pull exerted on an object having magnitude and direction • System—object that experiences the force • Environment—world around the system that exerts the force

  12. Two Categories of Forces… • Contact Force • Acts on an object only by touching it • Long-Range Force • Exerted without contact • Magnets • Gravity Agent: a specific, identifiable, immediate cause of a force

  13. Types of Forces • Ff - - Friction (opposes sliding) • FN - - Normal (surface) • Fsp - - Spring (push or pull of a spring) • FT - - Tension (spring, rope, cable) • Fthrust - - Thrust (rockets, planes, cars) • Fg - - Weight (force due to gravity)

  14. Newton’s Second Law • F = ma • a = Fnet / m • Expressed in Newtons (N) • Force required to give 1kg mass a 1m/s2 acceleration

  15. Example • A race car has a mass of 710 kg. It has a acceleration of 5 m/s2. What net force is exerted on it?

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