What is the advantage to using non-linear visual aids during a presentation?
a. they require a darkened the room, which causes the audience to pay more attention.
b. they may require additional work transporting and replacing worn objects.
c. they increase audience participation through close observation.

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?