6. Intro to Forces (Dynamics)

Which of the following best describes a correct free body diagram for a block resting on a horizontal surface with no applied forces other than gravity and the normal force?

Which of the following factors does not generally influence the resistance $R$ of a conductor?

If an object has two forces acting on it, which of the following statements is always true about the net force on the object?

Which of the following is an example of an unbalanced force that can change the motion of an object?

When a small car collides with a large truck, which vehicle experiences the greater magnitude of impact force during the collision?

A truss is loaded as shown, with a horizontal force of $1000 N$ applied to joint B. Member AB is oriented horizontally and connects joint A (pinned support) to joint B. What is the force in member AB, and is the member in tension or compression?

Which of the following is not an example of accelerated motion?

Which of the following best describes the correct set of reaction forces at points $A$ (a pin) and $B$ (a rocker) in the free-body diagram of a truss, where $A$ is a pin support and $B$ is a rocker support?

In a free body diagram, if ball $A$ and ball $D$ are both charged with opposite signs and placed near each other, what is the nature of the force between balls $A$ and $D$?

When replacing a system of forces and moments acting on a rigid body with an equivalent resultant force and couple moment at point O, which of the following statements is correct?

Which type of force is responsible for the normal reaction exerted by a surface on an object resting on it?

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

Which two factors does the power of a machine depend on?

Which of the following lists correctly identifies the four main factors that contribute to the vast majority of collisions according to physics and safety studies?

Which of the following statements correctly describes the units in which $\mathrm{force}$ can be expressed?