6. Intro to Forces (Dynamics)

A car of mass $m$ accelerates uniformly from rest to a velocity $v$ in time $t$. According to Newton's Second Law, what is the magnitude of the net force on the car?

According to Newton's First Law, what type of path does a moving object follow in the absence of a net external force?

Four masses are connected by massless, rigid rods to form a system. If the system is at rest and the net external force acting on it is zero $(F\_\{\mathrm{net}\}=0)$, which of the following statements best describes the motion of the system according to Newton's First Law?

According to Newton's First and Second Laws, what happens to an object if the forces acting on it are unbalanced?

Which of the following is a true statement about an object experiencing zero net force ($F=0$)?

Which statement best describes the difference between a balanced force and an unbalanced force according to Newton's First and Second Laws?

According to Newton's First Law, what is the tendency of a moving object when no net external forces ($F\_\mathrm{net}$) are acting on it?

An object at rest cannot remain at rest unless which of the following holds?

A $10‑\mathrm{lb}$ block A is moving downward with a speed of $6 \mathrm{ft}/s$ at a given instant. According to Newton's First Law, what can be concluded about the net force acting on the block at that instant if it continues to move downward at constant speed?

A $1-\mathrm{kg}$ ball is falling straight down and experiences an upward air resistance force of $2N$. What is the net force acting on the ball? (Assume acceleration due to gravity is $9.8m/s^2$.)

In a head-on collision between two cars of equal mass ($m$) moving at equal speeds ($v$) toward each other, what happens to the total momentum ($p$) of the system according to Newton's First and Second Laws?

A $5 \mathrm{kg}$ block is acted upon by two horizontal forces: $F_1=10 N$ to the right and $F_2=4 N$ to the left. What is the magnitude of the resultant force acting on the block?

In which of the following situations is the object experiencing unbalanced forces?

According to Newton's First and Second Laws, when lifting an object off the ground at constant velocity, what is the relationship between the upward force applied $F$ and the weight of the object $mg$?

According to Newton's First Law, what is the best explanation for why a large rock remains motionless on a flat sidewalk?