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Physics 20

Physics 20. Dynamics Review. I can …. Define Dynamics Define force as a vector quantity Use Newton’s First Law Use Newton’s Second Law (F=ma) Use Newton’s Third Law Use force due to gravity formula Define Weight F 1 = -F 2 Use Newton’s Law of Universal Gravitation

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Physics 20

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  1. Physics 20 Dynamics Review

  2. I can … • Define Dynamics • Define force as a vector quantity • Use Newton’s First Law • Use Newton’s Second Law (F=ma) • Use Newton’s Third Law • Use force due to gravity formula • Define Weight • F1 = -F2 • Use Newton’s Law of Universal Gravitation • Understand the principle behind the Cavendish Experiment

  3. I also can … • Explain a gravitational field and why it is vector • Define a sphere of influence • Calculate gravitational field strength • Relate gravitational field strength to weight • Calculate weight on different planets • Calculate true vs. Apparent weight • Define Normal force and how it relates to gravitational force • Understand that there is a force of friction that resists motion • Calculate the force of friction

  4. Wow this is a lot, but I also can … • Calculate forces (friction, gravity and normal) on an inclined plane (uses trig rules) • Define Elastic force • Calculate elastic force using distortion and the spring constant.

  5. Pearson Physics Page 192 #9 • A 1385 Kg pickup truck hitched to a 453 Kg trailer accelerates along a level road from a stoplight at 0.75 m/s² (forward). Ignore friction and air resistance. Calculate … • The tension in the hitch • The force of friction exerted by the road on the pickup truck to propel it forward. • The force the trailer exerts on the pickup truck.

  6. Pearson Physics Page 190 #7 • A 15 kg box is resting on a hill forming an angle with the horizontal. The coefficient of static friction for the box on the surface is 0.45. Calculate the maximum angle of the incline just before the box starts to move.

  7. Pearson Physics Page 231 #8 • Objects A and B experience a force of magnitude 2.5 x 10-8 N. Determine the magnitude of the gravitational force if the separation distance is halved, ma increases by 8 times and mb is reduced to ¼ of its original value.

  8. Pearson Physics Page 231 #9 • Suppose a 65 kg astronaut on Mars is standing on a scale calibrated in Newtons in an elevator. What will be the reading on the scale when the acceleration of the elevator is … • 0 • 7.2 m/s2 up • 3.6 m/s2 down Hint: Mass of Mars is 6.42 x 1023 kg Radius of Mars is 3.40 x 106 m

  9. Assignment • Pearson Physics Pg 192 -193 • Pearson Physics Pg 231

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