Abox is moved 10 m across a smooth floor by a force f making a downward angle with the floor, so that there is effectively a 4 n force acting parallel to the floor in the direction of motion and a 3 n force acting perpendicular to the floor. the force f acts for 20 seconds. the impulse delivered to the box by the floor during this process has magnitude
a- 80 ns
b- 60 ns
c- 100 ns
d- zero
e- can't tell without know the mass of the box

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe