PHYS 1408 Exam 2 Test Prep

The biker travels at constant velocity. All of the following are true except-

• he has a net force acting on him.

• the normal force is equal to his weight.

• the force of friction acts opposite the direction of his motion.

• the force of friction is equal to the forward force he applies.

Given M is mass, L is length, and T is time, force has dimensions [F] of:

• M*L^2*T^-2

• M*L*T^-2

• M*L*T^-1

• M^2*L*T

A Joule is defined as which of the following?

• 1 J = 1 N * 1 m

• 1 J = 1 N / 1 m

• 1 J = 1 kg*m^2/s^2

• 1 J = 1 kg*m/s

Suppose a conservative force acts INTERNALLY to a system to do work within it. Which of the following is a valid relationship between work and energy?

Suppose a conservative force acts EXTERNALLY to do work on it, and only changes the configuration of the system. Which of the following is a valid relationship between work and energy?

Suppose a conservative force acts EXTERNALLY to do work on it, and only changes the instantaneous motion of the system (the configuration at this moment remains the same). Which of the following is a valid relationship between work and energy?

Which of the following are equivalent to the statement "F is a conservative force"?

• F has an associated potential energy function

• F has an associated kinetic energy function

• The work done by F is path-independent

• The total amount of F is always conserved

• F is a constant force

Which of the following forces are conservative?

• Frictional force

• Spring force (by Hooke's law)

• Gravitational force

• Normal force

• Tension force

What type of equilibrium does this ball (currently at rest on the top of a frictionless hill) have?

• Not in equilibrium

• Stable equilibrium

• Neutral equilibrium

• Unstable equilibrium

What type of equilibrium does this ball (on the side of a frictionless hill) have?

• Not in equilibrium

• Stable equilibrium

• Neutral equilibrium

• Unstable equilibrium