Multiple Choice
In the context of types of forces and free-body diagrams, which of the following is NOT a force?
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6. Intro to Forces (Dynamics)
Types Of Forces & Free Body Diagrams
Multiple Choice
Which of the following could be an example of balanced forces acting on an object (net force )?
A
A hockey puck speeding up on ice because a player applies a forward force greater than friction
B
A cart being pulled to the right with constant pull while no other horizontal forces act
C
A book resting on a table, with the normal force upward equal in magnitude to the gravitational force downward
D
A skydiver just after jumping, when gravity is greater than air resistance
Verified step by step guidance1
Understand that balanced forces mean the net force on the object is zero, i.e., \(\net{F} = 0\), so the object either remains at rest or moves with constant velocity.
Analyze each option by identifying the forces acting on the object and comparing their magnitudes and directions.
For the hockey puck speeding up, the forward force is greater than friction, so forces are unbalanced and \(\net{F} \neq 0\).
For the cart being pulled with a constant pull and no other horizontal forces, the net force is equal to the pull force, so \(\net{F} \neq 0\) and the cart accelerates.
For the book resting on a table, the upward normal force equals the downward gravitational force, so forces are balanced and \(\net{F} = 0\), making this the correct example of balanced forces.
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