6. Intro to Forces (Dynamics)

If a load is applied straight downward at a joint in a truss, how does this affect the forces in the other members of the truss?

$$When a $F$orce is applied to a metal, what happens to the metal $c_{\mathrm{ations}}$ within the structure?

A water nozzle is fixed horizontally and ejects water at a constant speed, creating a jet with mass flow rate $𝜏$ and velocity $v$. If the nozzle is held stationary, what are the correct expressions for the horizontal and vertical forces required to hold the nozzle in place (neglecting gravity and friction)?

Suppose three objects experience the following net forces: Object A: $25 N$, Object B: $-68 N$, Object C: $0 N$. Which object has a net force of $-68 N$?

In the context of forces and kinematics, if a shaft is supported by a smooth thrust bearing at one end, which of the following best describes the type of reaction force provided by the bearing?

A simply supported beam of length $L$ carries a uniformly distributed load of intensity $w$ (force per unit length) along its entire span. What are the reactions at the two supports at the ends of the beam?

A $-1.0\mathrm{nC}$ point charge is placed in an electric field as shown in the figure. If the electric field at the location of the charge is $2.0\times {10}^{5}N/C$ directed to the right, what is the magnitude and direction of the force on the charge?

Which of the following best describes the difference between balanced and unbalanced forces acting on an object?

Which property of a bowling ball most directly affects the number of pins it knocks down when rolled at the same speed as other balls?

For the beam and loading shown, which equation correctly represents the condition for static equilibrium in the vertical direction?

Why is force considered a vector quantity in physics?

An object moves along a curved path and is at position c, where its velocity vector points to the right and the path curves upward. What is the direction of the net force acting on the object at position c?

An object of mass $m$ is suspended from a scale inside an elevator that is at rest. Which of the following correctly ranks the magnitude of the forces acting on the object: the gravitational force ($F_g$), the tension in the string ($T$), and the net force ($F_{\text{net}}$)? Assume upward is positive.

An 800-kg car is traveling along a horizontal road directly towards a cliff. The driver notices and brakes, resulting in a 5,000-N net force slowing the car down. If the car's initial speed was 20 m/s and the car stops just before going over the cliff, how far away was the car from the cliff when the driver hit the brakes?