Transcript Law of Gravitation Review

Circular Motion Review:
TEST
FRIDAY!
Guiding Conceptual Questions:
What is the difference between the centripetal force and the centrifugal force?
Where does the centripetal force and acceleration point?
Compare the centripetal force and acceleration experienced by a driver who makes a sharp turn v.s a wide turn at the same velocity.
How does he friction created by a car's tires affect your ability as the driver to turn? (Dry/Wet/Snow)
Guiding Mathematics Questions:
A sports car of mass 972 kg (including the driver) crosses the rounded top of a hill (radius = 91.8 m) at 24 m/s. Determine a) the normal force exerted by the road on the car, b)
the normal force exerted by the car on the 75 kg driver, and c) the car speed at which the normal force on the driver equals zero.
A 0.5 kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.6 m on a frictionless horizontal surface. If the cord will break when the tension on it exceeds 98 N, what
is the maximum speed it can have?
A ball on the end of a string is revolved at a uniform rate ina vertical circle of radius 76 cm,. If its speed is 4.5 m/s and its mass in 0.45 kg, calculate the tension in the string when the ball is
a) at the top of tits path, b) at the bottom of its path.
How fast in RPM must a centrifuge rotate if a particle 10.0 cm from its axis of rotation is to experience an acceleration of 122,000 g';s?
How many revolutions per minute would a 17 m diameter Ferris wheel need to make for the passengers to feel "weightless" at the top?
Law of Gravitation Review:
Guiding Conceptual Questions:
Who discovered the Universal Law of Gravitation?
How does this law affect our solar system?
Because you have mass and everything around you has mass, you are inherently attracted to everything around you. (Yes even students,
even students you can't stand).. explain why you can't feel this gravitational attraction on a daily basis.
How does circular motion and centripital force and centrepital acceleration relate to this law?
Guiding Mathematics Questions:
Determine the force of gravitational attraction between the earth (m = 5.98 x 10^24 kg) and a 70-kg physics student if the student is standing at sea level, a
distance of 6.38 x 10^6 m from earth's center.
Determine the force of gravitational attraction between the earth (m = 5.98 x 10^24 kg) and a 70-kg physics student if the student is in an airplane
at 40000 feet above earth's surface. This would place the student a distance of 6.39 x 10^6m from earth's center.
Prove that the acceleration of gravity on Earth's Surface is 9.8 around m/s^2 using the Law of Gravitation
Prove that the acceleration of gravity on Moons's Surface is around 1.6 m/s^2 using the Law of Gravitation
Prove that the acceleration of gravity on Mars's Surface is around 3.7 m/s^2 using the Law of Gravitation
TEST
FRIDAY!