6. Intro to Forces (Dynamics)

Which statement best describes the law of superposition as it relates to $N’s^1$ and $N’s^2$ Laws?

According to Newton's First Law, when you and your snowboard are in motion on a flat, frictionless surface, what will happen if no net external force acts on you?$F=0$

According to Newton's First and Second Laws, how many forces act on a freely falling object (neglecting air resistance)?

According to Newton's First and Second Laws, if you are holding a uniform pole horizontally and keeping it motionless, how much upward force must you exert to keep the pole in equilibrium?

According to Newton's First and Second Laws, what effect can a net force ($F\_\mathrm{net}$) have on an object?

Which of the following best describes Newton's First Law of Motion?

A metal ball sits motionless on a flat surface. Which of the following actions would cause the ball to start moving according to Newton's First and Second Laws ($F_{\mathrm{net}}=ma$)?

According to Newton's Second Law, which relates force, mass, and acceleration ($F=ma$), is walking likely to be an effective way to build significant muscle mass?

According to Newton's First Law, if the net force on an object is $0$, what will happen to the object's motion?

Which type of motion is most likely to involve a shaft that can easily grip hair and clothing, potentially causing injury if not handled properly?

A quarterback of mass $m_q$ is initially at rest and throws a football of mass $m_b$ forward with velocity $v_{bf}$ relative to the ground. Neglecting external forces, how fast, $v_{qf}$, will the quarterback be moving backward just after releasing the ball?

In a system of three point charges arranged linearly as shown in Figure 1, charge $q_2$ experiences no net electric force. Which of the following statements must be true about the magnitudes and signs of the charges?

A chicken is balancing itself against a strong wind, remaining at rest. According to Newton's First and Second Laws, which of the following statements best describes the forces acting on the chicken?

Which of the following lists the three main factors that affect the force of impact in a collision, and identifies which of these a driver can control?

In the figure, an electron is accelerated from rest through a potential difference of $V$. What is the final speed of the electron, assuming non-relativistic motion?