6. Intro to Forces (Dynamics)

According to Newton's laws, forces always occur in which of the following ways?

Which of the following can cause a moving object to change its direction according to $N{1}^{\mathrm{st}}$ and $N{2}^{\mathrm{nd}}$ Laws?

According to Newton's Second Law, why does a heavy object not accelerate more than a light object when both are freely falling in the absence of air resistance?

When reversing direction, you should consider:

A cart is moving at constant velocity on a frictionless track when a switch in the circuit powering its motor is opened, cutting off the force driving the cart. According to Newton's First and Second Laws ($\text{F = ma}$), what will happen to the cart immediately after the switch is opened?

Which of the following is an example of balanced forces?

According to Newton's First Law, balanced forces acting on an object will result in which of the following outcomes?

FIGURE EX5.14 shows an object's acceleration-versus-force graph. What is the object's mass?

Problems 35, 36, 37, 38, 39, and 40 show a free-body diagram. For each: Identify the direction of the acceleration vector a and show it as a vector next to your diagram. Or, if appropriate, write a = 0.

A $4.50$-kg experimental cart undergoes an acceleration in a straight line (the $x$-axis). The graph in Fig. E$4.13$ shows this acceleration as a function of time. During what times is the net force on the cart a constant?

In the context of Newton's First and Second Laws, what is the primary function of the first stage of a multistage rocket during launch?

A dockworker applies a constant horizontal force of $80.0$ N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves $11.0$ m in $5.00$ s. What is the mass of the block of ice?

According to Newton's Second Law, the magnitude of the block's acceleration reaches its maximum value when the block is subjected to which of the following conditions?