6. Intro to Forces (Dynamics)

According to Newton's First Law, for an object to remain at rest, which of the following must be true about the forces acting on it?

According to Newton's Second Law, what does the sum of all forces acting on an object equal to? $\sum F$ = $ma$

When driving through a curve at normal speed, which force is primarily responsible for keeping the car moving along the curved path?

Consider an object at rest. Which of the following is true concerning this object?

Two blocks, A and B, with masses $m_A$ and $m_B$ respectively, are in contact on a frictionless horizontal surface. A constant horizontal force $F$ is applied to block A, pushing both blocks to the right. What is the magnitude of the force that block A exerts on block B?

Stopping a vehicle with good brakes from $20\mathrm{miles}/\mathrm{hour}$ under good conditions requires about how many feet of stopping distance?

According to Newton's First and Second Laws, if a truck and a car are both moving at the same speed $v$ and apply the same braking force $F$, how does the stopping distance of the truck on a wet road compare to that of the car?

Which of the following correctly describes Newton's First and Second Laws of Motion?

A constant net force acts on an object. Which of the following best describes the object's motion?

According to Newton's First and Second Laws, if a wheel initially rotating clockwise is instead set to rotate counterclockwise with the same magnitude of angular velocity $\omega$, how does this reversal affect the net torque $\tau$ required to bring it to rest in the same amount of time $t$?

According to Newton's First and Second Laws, if an approaching train is near enough to be a danger, what should a person standing on the tracks do to avoid injury?

A $3.0\mathrm{kg}$ object is acted upon by two forces: $F{1}_1$ = $10\to$ $N$ to the right and $F{2}_2$ = $4\leftarrow$ $N$ to the left. What is the magnitude of the object's acceleration?

According to Newton's First and Second Laws, how much damage a shock causes depends on which three factors?

Which of the following can cause a moving object to change its direction: $gravity$, $inertia$, both, or neither?

Which of the following best describes a $\mathrm{newton}$?