6. Intro to Forces (Dynamics)

What is responsible for the apparent change in weight that riders experience on roller coasters?

A box is being pulled to the right with a force of $10N$ and to the left with a force of $4N$. What is the magnitude and direction (right or left) of the net force acting on the box?

Three identical bricks are placed in a row on a frictionless surface. A hand pushes only the first brick to the right, causing all three bricks to accelerate together. Which statement best describes the magnitude of the force that the second brick exerts on the third brick compared to the force that the hand exerts on the first brick?

Three ropes are tied to a small ring and pull on it with forces in different directions. If the ring remains at rest, which of the following statements is true about the vector sum of the forces acting on the ring?

A simple truss is constructed in the shape of an equilateral triangle with each side of length $L$. A load of $P$ is applied vertically downward at the top vertex. Assuming all joints are pin-connected and the truss is supported at the two base vertices, which of the following gives the magnitude of the force in each of the two base members?

A positive charge $b$ is placed between two other positive charges of equal magnitude, one to its left and one to its right. Four arrows (A, B, C, D) point: A to the right, B to the left, C upward, and D downward. Which of the arrows is in the direction of the net force on charge $b$?

A force $F=10$ N acts along the positive x-axis, and another force $F=10$ N acts along the positive y-axis. What is the magnitude and the coordinate direction angles (with respect to the $x$, $y$, and $z$ axes) of the resultant force?

In the context of vehicle motion, the point at which the brakes are first applied and begin to slow down the vehicle is called the

Which two fundamental forces are essential for the operation of generators and electric motors?

A horizontal beam is supported at points B and D. If the distance between supports is $b$ and $b=60\mathrm{mm}$, and a downward force of $100N$ is applied at the midpoint between B and D, what are the reaction forces at B and D?

Which of the following interactions does not occur due to field forces?

A simply supported beam of length $L$ carries a uniformly distributed load of intensity $w$ (force per unit length) across its entire span. What is the magnitude of the reaction force at each support?

Which of the following best describes the components that make up a force vector acting on an object on an inclined plane at angle $\theta$ to the horizontal?

In the context of gravitational forces between two masses, at which point is the force of attraction between them the strongest? (Recall that the gravitational force between two masses $m_1$ and $m_2$ separated by a distance $r$ is given by $F=\frac{G}{r}$ where $G$ is the gravitational constant.)

A child of mass $m$ slides down a frictionless slide inclined at an angle $\theta$ to the horizontal. How large is the normal force of the slide on the child?