6. Intro to Forces (Dynamics)

A horizontal beam is suspended by two vertical ropes at points A and D. At a certain instant, the tension in rope AB is $300 N$ and the tension in rope DE is $200 N$. What is the total weight of the beam if it is in static equilibrium and no other vertical forces act on it?

What effect does an unbalanced force have on an object?

What happens when you hold the $s-\mathrm{pole}$ of one magnet close to the $n-\mathrm{pole}$ of another magnet?

A $100 \mathrm{kg}$ mass is suspended by two cables attached to a ceiling at points A and B, which are $3 m$ apart. The mass hangs $2 m$ below the line joining A and B, directly between them. Neglecting the mass of the cables, what is the tension in each cable and the vertical component of the reaction at the support point D directly above the mass?

A cantilevered beam is fixed at support $A$ and subjected to external loads. Which of the following best describes the components of the support reactions at point $A$?

A block is resting on an inclined plane. Which of the following forces act on the block?

When a book is dropped and falls freely to the floor (neglecting air resistance), which forces are acting on it during its fall?

A block of mass $m$ is sliding to the right on a rough horizontal surface. The forces acting on the block are its weight $W$, the normal force $N$, a rightward applied force $F$, and a leftward friction force $f$. Which equation correctly represents the block's acceleration $a$?

When a sky diver opens her parachute during free fall, which of the following occurs immediately after the parachute opens?

A $100 \mathrm{kg}$ mass is suspended by two cables attached to a ceiling at points A and B, which are $3 m$ apart. The mass hangs directly below point D, which is $1 m$ from A and $2 m$ from B. Assuming the system is in equilibrium, what is the tension in the cable from A to D?

A rectangular wire loop of length $L$ and width $w$ carries a current $I$ and is placed in a uniform magnetic field $B$ such that the plane of the loop is parallel to the field. What is the magnitude of the total force on the loop?

A force vector $p$ has a magnitude of $p$ and makes an angle $\theta$ with the x-axis. What is the y-component $p_y$ of the force?

If a load is applied straight downward to a stationary object resting on a horizontal surface, which force balances the downward force of the $F\_\mathrm{load}$?

An object is at rest under the influence of two forces, $F_1$ and $F_2$. To keep the object at rest, a third force $F_3$ is added. Which of the following correctly describes the direction and magnitude of $F_3$?

An object moves along a straight line and its velocity-time graph is shown. At position $b$, the velocity is decreasing. What is the direction of the net force acting on the object at position $b$?