Physics

  English Mathematician/Physicist  Geophysicis  Meteorology  Astronomy  Cartography

 Numerous inventions and contributions  Determined the size of the solar system  Catalogued 341 stars  The diving bell  Periodic behavior of Halley’s comet  Improved the sextant  Sunspots  First trade wind charts

  Physicist, mathematician, astronomer, philosopher, & alchemist  Philosophiæ Naturalis Principia Mathematica  Calculus  3 laws of motion  Law of universal gravitation  Derived the laws of planetary motion  Many other contributions

 When no external force acts upon an object, its velocity remains constant.  Objects at rest will remain at rest (unless acted on by an external force).  Objects in motion will remain in motion at a constant velocity in a straight line (unless acted on by an external force).  AKA: Law of Inertia

 When an external force acts upon an object, the object accelerates.  The acceleration..  Is in the same direction as the applied force.  Varies directly with the force applied.  Varies inversely with the mass of the object  F net =ma net  F – force (measured in Newtons “N”)  m – mass (measured in kilograms “kg”)  a – acceleration (measured in “m/s 2 ”)

 For every action force, there exists a reaction force that is equal in magnitude but opposite in direction.

 A football player pushes horizontally against a training sled. The mass of the sled is 158kg, and the friction while sliding is 775 N.  What is the weight of the sled?

 A football player pushes horizontally against a training sled. The mass of the sled is 158kg, and the friction while sliding is 775 N.  What is the weight of the sled?  What is the normal force exerted by the ground onto the sled?

 A football player pushes horizontally against a training sled. The mass of the sled is 158kg, and the friction while sliding is 775 N.  What is the weight of the sled?  What is the normal force exerted by the ground onto the sled?  How much force does the player need to apply in order to maintain a constant velocity?

 During a collision, a car with a total mass of 1500kg is stopped by a force of N.  What is the acceleration of the car?

 During a collision, a car with a total mass of 1500kg is stopped by a force of N.  What is the acceleration of the car?  What was the initial velocity of the car? ▪ Additional info: time of collision = 0.1 s

 During a collision, a car with a total mass of 1500kg is stopped by a force of N.  What is the acceleration of the car?  What was the initial velocity of the car? ▪ Additional info: time of collision = 0.1 s  What is the net force acting on the driver? ▪ Additional info: m driver = 85 kg