6. Intro to Forces (Dynamics)

According to Newton's laws, when do forces always occur?

According to Newton's First Law, are the forces acting on a stationary object balanced, and why?

Which statement best describes the difference between an unbalanced force and balanced forces acting on an object?

When a pair of $10-N$ forces act on a box of candy in opposite directions, what is the net force on the box?

A block of mass $m$ is attached to a light, inextensible cable and hangs vertically. The system is released from rest with the cable taut. According to Newton's Second Law, what is the magnitude of the acceleration of the block immediately after release, neglecting air resistance?

Under which flight condition does the $p$-factor cause an airplane to yaw to the left?

According to Newton's Second Law, which equation correctly expresses how to find the applied force acting on an object of mass $m$ experiencing an acceleration $a$?

Which of the following statements about dynamics is correct?

A heavy steel cable attached to a motor is lifting a girder, and the girder is speeding up. Which of the following statements best describes the forces acting on the girder according to Newton's Second Law?

According to Newton's First Law, can there be forces acting on an object that is at rest?

A block of mass $m_1$ is initially at rest on a frictionless horizontal surface. A constant force $F$ is applied to the block for a time interval $t$. What is the final speed $u_f$ of block 1 at the end of the time interval?

According to Newton's Second Law, if the net force acting on an object is doubled while its mass remains constant, what happens to the object's acceleration? $F=ma$

If your physics textbook is sliding to the right across a horizontal table and slowing down, which of the following statements best explains the $\mathrm{net} \mathrm{force}$ acting on the book?

Which statement is true according to Newton's First Law of Motion?

A particle moves along the x-axis so that its position as a function of time is given by $x=2t^3-9t^2+12t$, where $x$ is in meters and $t$ is in seconds. At what time or times is the particle moving to the right at maximum speed?