6. Intro to Forces (Dynamics)

In the context of free body diagrams, what is the term for the sum of all forces acting on an object? $\left(\text{i.e.,}\sum _{\text{all forces}}\right)$

Which of the following is a disadvantage of series circuits?

A toy truck is at rest on the floor. Which statement best describes the forces acting on the toy truck?

In the context of free body diagrams and types of forces, how is the function of a valve on a cooler similar to the function of a switch in an electric circuit?

The extension of the arm at the elbow is an example of what type of lever system?

Which of the following can be contributing factors that can cause collisions?

Which of the following is an example of a contact force?

In the study of forces and free body diagrams, what two aspects of a force do scientists typically measure?

When a student is sitting motionless in a chair, are the forces acting on the student balanced or unbalanced?

Which type of stress pulls a material apart?

Which action may cause the loss of steering ability in a personal watercraft ($\mathrm{PWC}$)?

A piano of mass $m$ rests on a horizontal floor. Which of the following free-body diagrams accurately represents all the forces acting on the piano?

A wheelbarrow is shown in a free-body diagram with three forces acting on it: an upward normal force of $300N$ at the wheel, a downward gravitational force of $400N$ at the center of mass, and an upward lifting force of $150N$ at the handles. What is the net force acting on the wheelbarrow in the vertical direction?

Which change to a wire would cause its resistance ($R$) to decrease?