7. Friction, Inclines, Systems

In Hooke's law, expressed as $F=-kx$, what is the significance of the negative sign?

Which of the following best indicates that a spring obeys Hooke's Law?

Which of the following graphs best illustrates Hooke's Law for an ideal spring, where force is plotted on the vertical axis and displacement on the horizontal axis? $F=kx$

A 12 kg weather rocket generates a thrust of 200 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 550 N/m, is anchored to the ground. Initially, before the engine is ignited, the rocket sits at rest on top of the spring. How much is the spring compressed?

Why is there a negative sign in the equation for Hooke's law, $F=-kx$?

If you want a spring to stretch by $0.2 m$ when a force of $10 N$ is applied, what spring constant should you specify?

In Hooke's Law, which quantity is represented by the spring constant $k$?

The measure of a spring's resistance to being compressed or stretched is the:

If the spring constant of a spring is doubled, what happens to the extension $x$ produced by a given force $F$ according to Hooke's Law $F=kx$?

A spring is wrapped around a vertical pole as shown. If a mass is attached to the end of the spring and pulled downward, which equation best describes the restoring force exerted by the spring according to Hooke's Law?

Which statement best describes a spring according to Hooke's Law?

According to Hooke's Law, where in the motion of a mass-spring system is the spring force $F=0$?

According to Hooke's Law, how does an elastic material exert an elastic force when it is stretched or compressed?

Which of the following $F$ vs. $x$ graphs best represents a spring that becomes less stiff as it is stretched?

The measure of a spring's resistance to being compressed or stretched is the