you in a car as you go over the top of a sharp bump:

** 12. A girl pushes horizontally cient of kinetic friction between the crate and the floor is 0.2; the coefficient of static friction is 0.4. on a 100-kg crate, as shown in the two figures below. The coeffi- a) For each of the two situations described in the figures, indicate whether the frictional force is static or kinetic. b) In each case, find the magnitude of the frictional force. Case 1: The girl is pushing with a force of 300 N, and the crate does not move. Case 2: The girl is pushing with a force of 300 N, and the crate is moving along the floor.

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The resultant of the two forces has a magnitude of?1. 5 N2. 7 N3. 12 N4. 13 N

A 40 N box is resting on a table when a 20 N force is applied to it horizontally. The coefficients of static and kinetic friction are 0.3 and 0.1, respectively. Which of the following best describes the resulting motion of the box?    The motion of the box cannot be determined with the given information.      The box accelerates in the direction of the applied force.      The box remains at rest.      The box moves with a constant velocity in the direction of the applied force.

A.) If the coefficient of kinetic friction between a 28 kg crate and the floor is 0.38, what horizontal force is required to move the crate at a steady speed across the floor? Express your answer to two significant figures and include the appropriate units. F= __________ ___________