7. Friction, Inclines, Systems

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

A vertical spring has a spring constant of $250N/m$. If a $3.0\mathrm{kg}$ mass is suspended from the spring and allowed to come to rest, what is the total length of the spring if its original (unstretched) length is $0.40m$? (Assume $g=9.8m/s^2$.)

A block of mass $m$ is at rest on a frictionless horizontal surface and is attached to a wall by an ideal spring with spring constant $k$. If the block is displaced a distance $x$ from equilibrium and released, what is the magnitude of the force exerted by the spring on the block at that instant?

In Hooke's law, which equation correctly relates the force exerted by a spring to its displacement?

In a car's suspension system, what prevents the springs from bouncing continuously after hitting a bump?

Three identical springs are hanging vertically from the ceiling. If a mass $m$ is attached to the end of each spring, which of the following correctly describes the extension $x$ of each spring according to Hooke's Law?

In Hooke's Law, which equation correctly relates the force exerted by a spring to its displacement from equilibrium?

When a spring is compressed, which form of energy increases?

According to Hooke's Law ($F=-kx$), if a spring is stretched to three times its original displacement ($x$ becomes $3x$), by what factor does the elastic potential energy ($U=\frac{1}{2}k{x}^2$) stored in the spring increase?