6. Intro to Forces (Dynamics)

According to Newton's First Law, what is the state of an object when all the forces acting on it are balanced ($\sum F=0$)?

If Siobhan hits a $0.25kg$ volleyball with a force of $0.5N$, what is the acceleration of the volleyball according to Newton's Second Law?

According to Newton's First and Second Laws, if the forces acting on an object at rest are unbalanced, what will happen to the object?

According to Newton's First and Second Laws, if two vehicles of different masses arrive at an uncontrolled intersection at the same time and both apply the same braking force ($F$), which vehicle will come to a stop in a shorter distance?

According to Newton's First and Second Laws, which of the following can cause a moving object to change its direction?

A $710$ kg car drives at a constant speed of $23$ m/s and is subject to a drag force of $500$ N. What is the magnitude of the forward force provided by the engine?

When jumping straight up from a crouched position, an average person can reach a maximum height of about $60$ cm. During the jump, the person's body from the knees up typically rises a distance of around $50$ cm. To keep the calculations simple and yet get a reasonable result, assume that the entire body rises this much during the jump. Draw a free-body diagram of the person during the jump.

According to Newton's First Law, which value of net force acting on an object will result in no change in the object's motion?

Two blocks, $a$ and $b$, are connected by a string and pulled to the right by a hand holding block $a$. Is the force of the string on block $b$ larger than, smaller than, or equal to the force of the hand on block $a$?

In the context of Newton's First and Second Laws, which physics principle best explains why a car may experience a spinout when turning sharply on a slippery road?

In the context of Newton's First and Second Laws, what is the force with which a moving object hits another object called?

A $5 \mathrm{kg}$ object is acted upon by two forces: $10 N$ to the right and $6 N$ to the left. According to Newton's Second Law, what is the magnitude of the resultant force acting on the object?

In an Atwood machine consisting of two masses $m_1$ and $m_2$ connected by a light, inextensible string over a frictionless pulley, which of the following correctly gives the acceleration $a$ of the system (take upward as positive for $m_1$)?

If a block is moving to the left at a constant velocity, what can one conclude about the forces acting on it?

According to Newton's First Law, what type of force is required to set a stationary soccer ball into motion?