All objects moving in a circle experience centripetal force The form of centripetal force depend on the object in circular motion & the force causing the circular movement Which of the following describes the correct centripetal force acting on an object moving in a circle? The force of air resistance as a roller coaster performs a loop on a track
The force of friction as a car drives around a corner at constant speed
The force of gravity as a ball on a string is spun horizontaly in a circle
The force of inertia as a person spins on a ride at amusement park

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s