6. Intro to Forces (Dynamics)

According to Newton's First Law, what will a moving object do when the forces acting on it are balanced ($F=0$)?

A 500 g ball moves horizontally with velocity v_𝓍 = ( 15 m) / (t + 1 s) for t > 0 s. What is the net force on the ball at t = 1 s?

(II) A 3.0-kg object has the following two forces acting on it:

${\vec{F}}_1=(16\hat{i}+12\hat{j})\text{N}$

${\vec{F}}_2=(-10\hat{i}+22\hat{j})\text{N}$

If the object is initially at rest, determine its velocity $\overrightarrow{v}$ at t = 4.0s .

According to Newton's First and Second Laws, which of the following is the most effective way to push an object to achieve the greatest acceleration, assuming $m$ is constant and friction is negligible?

Which of the following best describes the difference between balanced forces and unbalanced forces according to Newton's First and Second Laws?

Suppose that $\overrightarrow{v}=0$ cm. Which of the following must be true?

Which of the following best describes Newton's Second Law, often referred to as the basic speed law in physics?

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

According to Newton's First and Second Laws, which type of force will cause a change in an object's motion?

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

A package of mass m is placed onto a horizontal conveyor belt moving at speed v (Fig. 7–32). The coefficient of kinetic friction between package and belt is μ_k. How long does it take the package to stop sliding on the belt? [Hint: Use F = ma.]

A small $8.00$-kg rocket burns fuel that exerts a time-varying upward force on the rocket (assume constant mass) as the rocket moves upward from the launch pad. This force obeys the equation $F=A+B{t}^2$. Measurements show that at $t=0$, the force is $100.0$ N, and at the end of the first $2.00$ s, it is $150.0$ N. Find the constants $A$ and $B$, including their SI units.

On September 8, 2004, the Genesis spacecraft crashed in the Utah desert because its parachute did not open. The $210$-kg capsule hit the ground at $311$ km/h and penetrated the soil to a depth of $81.0$ cm. What was its acceleration (in m/s² and in g's), assumed to be constant, during the crash?

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?