AnswersPhysicsNewton's First and Third Laws

Newton's First and Third Laws — Quiz Answers

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1
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Which best describes the forces identified by Newton’s third law of motion?

A
unequal and acting on the same object
B
unequal and acting on different objects
C
equal and acting on different objects
D
equal and acting on the same object
3

A car is moving east along a straight, level road at a constant velocity. Which forces form an action/reaction force pair?

A
the normal force on the car and the force of the car pulling on Earth
B
the force of the engine on the car and the force due to friction on the car
C
the weight of the car and the force of the road pushing up on the car
D
the force of the tires against the road and the force of the road on the tires
4

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 push force on the box
C
the upward force of the table on the box
D
the reaction force on the box
5

Keisha writes that if an object has any external forces acting on it, then the object can be in dynamic equilibrium but not static equilibrium. Which statement best describes Keisha’s error?

A
An object that is not moving is always in static equilibrium.
B
An object that is moving must be in dynamic equilibrium.
C
An object in either state of equilibrium must have no forces acting on it.
D
An object in either state of equilibrium must have no net force acting on it.
6

Which situation is contrary to Newton’s first law of motion?

A
A moving object slows down when an external force is applied.
B
An object at rest begins to move when an external force is applied.
C
A moving object has a constant velocity under the influence of balanced forces.
D
An object at rest stays at rest as long as unbalanced forces act on it.
8

Which object is in static equilibrium?

A
a rolling ball that has a net force acting on it
B
a book that has no net force acting on it and is sitting on a table
C
a vase that has a net force acting on it and is sitting on a shelf
D
a cruising car that has no net force acting on it
10

Keisha writes that if an object has any external forces acting on it, then the object can be in dynamic equilibrium but not static equilibrium. Which statement best describes Keisha’s error?

A
An object that is moving must be in dynamic equilibrium.
B
An object that is not moving is always in static equilibrium.
C
An object in either state of equilibrium must have no forces acting on it.
D
An object in either state of equilibrium must have no net force acting on it.

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