Answers2003390-Physics 1 Honors Sem. 1 - PetersLesson 2: Newton's First and Third Laws

Newton's First and Third Laws Answers

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John pushes Hector on a plastic toboggan.The free-body diagram is shown.

Question illustration
A
245 N
B
735 N
C
490 N
D
980 N
2
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Which situation is contrary to Newton’s first law of motion?

A
An object at rest begins to move when an external force is applied.
B
A moving object has a constant velocity under the influence of balanced forces.
C
An object at rest stays at rest as long as unbalanced forces act on it.
D
A moving object slows down when an external force is applied.
3

Which object is in static equilibrium?

A
a rolling ball that has a net force acting on it
B
a cruising car that has no net force acting on it
C
a book that has no net force acting on it and is sitting on a table
D
a vase that has a net force acting on it and is sitting on a shelf
4

Which best describes the forces identified by Newton’s third law of motion?

A
equal and acting on different objects
B
equal and acting on the same object
C
unequal and acting on different objects
D
unequal and acting on the same object
5

A box is sitting on the floor. The box was then pulled with a force, Ft. The box did not move. The free-body diagram of the box is shown.

Question illustration
A
It is moving up with a net force of 20 N.
B
It is moving to the right with a net force of 10 N.
C
It is in dynamic equilibrium with a net force of 0 N.
D
It is in static equilibrium with a net force of 0 N.
6

Lien is pushing a box across a table. She used a force of 100 N to get the box moving. Which force did she overcome to get the box moving?

A
the downward force of gravity on the box
B
the upward force of the table on the box
C
the reaction force on the box
D
the push force on the box
9

Which is an action/reaction force pair? Check all that apply.

A
Earth pulls on a book, and the book pushes against a shelf.
B
A hockey stick hits a puck, and the puck pushes against the stick.
C
A pencil pushes against a piece of paper, and the paper pushes against the desk.
D
A finger pulls on a rubber band, and the rubber band pushes against the finger.
E
A dog pulls on a leash, and the owner pulls back on the leash.
10

A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off. What force does the wall exert on the ball?

A
10 N to the left
B
10 N to the right
C
more than 10 N to the left
D
more than 10 N to the right

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