When analyzing dynamics problems, free-body diagrams

are more useful when analyzing horizontal forces than when analyzing vertical forces

should include only the forces that are directly responsible for the acceleration

should be used only when objects are accelerating

only apply to objects in equilibrium

Study the free-body diagram below and choose the statement that best describes the object's motion.

The object will accelerate northeast.

The object will travel north with a constant velocity.

The object will travel with uniform motion.

The object will accelerate north.

Two identical arrows, A and B, are fired with different bows. The bow that fires arrow A exerts twice the average force as the bow that fires arrow B. Compare the accelerations of the two arrows.

Arrow A will have twice the acceleration of arrow B.

Arrow A will have four times the acceleration of arrow B.

Arrow B will have four times the acceleration of arrow A.

Arrow A and arrow B will have the same acceleration.

Arrow B will have twice the acceleration of arrow A.

Newton's third law essentially states

acceleration only occurs if there is net force

the acceleration of an object depends on its mass and the net force acting on it

objects which are moving tend to stay moving

objects won't move unless pushed

An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object?

The force(s) acting forward is/are greater than the force(s) acting backward.

The sum of all forces has a value directed forward.

The forces acting on the object can be said to be “unbalanced.”

Newton’s second law best summarizes the effect of the forces acting on the object.

Which of the following observations would be adequately explained by Newton's third law?

A skater stands on a frictionless pond, tosses her bag in one direction and she accelerates in the opposite direction.

When turning a corner, a passenger in a car is pushed against the door.

The normal force on an object is always equal to the force of gravity acting on the same object.

The friction of a surface causes a sliding object to come to rest.

When firing a rifle, the force of the rifle on the bullet, is greater than the force of the bullet back on the rifle.

Describe the motion of the 2.0 kg mass below in the horizontal plane.

The object accelerates at 1.5 m/s2 [right]

The object accelerates at 13 m/s2 [right]

The object accelerates at 12 m/s2 [right]

The object accelerates at 11 m/s2 [right]

Newton’s Laws & FBDs Quiz: Can You Solve The Forces? Mind Map

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| By Junho Song

Junho Song, Physics/Science Teacher

Junho Song, a dedicated educator, specializes in teaching physics and science. Passionate about inspiring students in the fascinating world of scientific discovery and understanding.

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| Attempts: 8,161 | Questions: 18 | Updated: Nov 12, 2025