6. Intro to Forces (Dynamics)

A book is sitting at rest on a horizontal desk. Which statement best describes the normal force acting on the book?

Why is the support force on an object often called the $\mathrm{normal}$ force?

A roller coaster car of mass $m$ passes over a hill at point $d$ with speed $v$. The radius of curvature of the hill at point $d$ is $r$. What is the normal force exerted on the rider when passing point $d$?

In the context of vertical forces, in which direction does the normal force $F_n$ act relative to a surface?

Three identical boxes A, B, and C rest on horizontal surfaces. Box A is on a flat table, box B is on the same table with an additional weight placed on top, and box C is on the same table with someone pulling upward on it with a rope (but not lifting it off the table). Rank the boxes in order of the magnitude of the normal force acting on them, from greatest to least.

The Mars Rover Perseverance weighed about 10,000 N while on Earth. After it reached the surface of Mars, it weighed about 3790 N. What is the gravitational acceleration on Mars?

A 3-kg bucket is being pulled upwards by a cord. The tension in the cord is 35 N. What is the acceleration of the bucket? (The mass of the cord is negligible, which means you can assume m_cord = 0.)

You walk into an elevator, step onto a scale, and push the 'up' button. You recall that your normal weight is $625$ N. Draw a free-body diagram. If you hold a $3.85$-kg package by a light vertical string, what will be the tension in this string when the elevator accelerates as in part (a)? Note: Part (a) asked what does the scale read when the elevator has an upward acceleration of magnitude $2.50$ m/s².

At the surface of Jupiter's moon Io, the acceleration due to gravity is $g = 1.81$ m/s². A watermelon weighs $44.0$ N at the surface of the earth. What would be its mass and weight on the surface of Io?

At the surface of Jupiter's moon Io, the acceleration due to gravity is $g=1.81$ m/s². A watermelon weighs $44.0$ N at the surface of the earth. What is the watermelon's mass on the earth's surface?

An astronaut's pack weighs $17.5$ N when she is on the earth but only $3.24$ N when she is at the surface of a moon. What is the acceleration due to gravity on this moon?

You walk into an elevator, step onto a scale, and push the 'up' button. You recall that your normal weight is $625$ N. Draw a free-body diagram. When the elevator has an upward acceleration of magnitude $2.50$ m/s², what does the scale read?