1. A heavy box is sitting in the middle of a skating rink. You are on skates and
ID: 1623578 • Letter: 1
Question
1. A heavy box is sitting in the middle of a skating rink. You are on skates and when you push on the box with a force of magnitude Fbu you experience a force of magnitude Fub on yourself due to the box. How do the magnitudes Fbu and Fub compare?
a) Fbu < Fub
b) Fbu > Fub
c) Fbu = Fub
2. When used in reference to one of the components of the contact force between two objects, the term 'normal' means...
a) 'usual' not abnormal
b) 'vertical'
c) 'perpendicular'
3. Consider the gravitational force acting on an object of mass m due to another object, also of mass m, that is a distance r away. If the distance between the two objects is doubled, then the magnitude of the gravitational force on either of the objects...
a) doubles.
b) quadruples.
c) becomes one-quarter of the original value.
d) becomes one-half of the original value.
4. Fill-in the blank in the following sentence: "If the net force acting on an object is constant and non-zero, then the _________ of the object is changing at a constant rate."
a) displacement
b) acceleration
c) velocity
5. An object is initially sliding across a frictionless, horizontal surface with a constant velocity in the +x direction. The object then moves through a horizontal region where there is friction and, as a result, slows down. While moving through the horizontal region where there is friction, the net force on the object is ...
a) zero.
b) in the +x direction.
c) in the -x direction.
d) in a direction that can only be determined if more information is provided.
Explanation / Answer
1. c) Fbu = Fub
2. c) 'perpendicular'
3. c) becomes one-quarter of the original value.
4. c) velocity
5. c) in the -x direction.
it may seem that all answers are C can not be true but i assure you they are all correct
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