Introduction to Applied Physics Milbank High School.

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Presentation transcript:

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 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

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?

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

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?

Which cars are accelerating??

Acceleration The rate of change of velocity divided by time change Usually m/s/s…..or m/s 2

Is the velocity constant?

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

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

Types of Forces F f - - Friction (opposes sliding) F N - - Normal (surface) F sp - - Spring (push or pull of a spring) F T - - Tension (spring, rope, cable) F thrust - - Thrust (rockets, planes, cars) F g - - Weight (force due to gravity)

Newton’s Second Law F = ma a = F net / m Expressed in Newtons (N) – Force required to give 1kg mass a 1m/s 2 acceleration

Example A race car has a mass of 710 kg. It has a acceleration of 5 m/s 2. What net force is exerted on it?