Purpose
This interactive provides visual and numerical examples of the behavior of, and relationships between, velocity, acceleration, and force in uniform circular motion.

Using the interactive

• Configure the interactive using the CONTROLS template on the right.
• The vertical slider on the left controls the angle at which you view the motion.
• The Equations box just to the upper right of the animation displays equations indicating the formula, units, calculation, and value of the acceleration and the force on the mass.
• The Graph box just to the lower right of the animation displays graphs of the desired velocity, acceleration, and force components as functions of time.

• Velocity: Controls the tangential speed of the circular motion.
• Mass: Controls the mass of the ball in motion.
• Play/Pause: Starts and stops the animation of the motion.
• Step: move the ball stepwise with each click of this button
• Vectors: Displays arrows indicating the directions and magnitudes of the velocity, acceleration, and force vectors. When Velocity is selected, the horizontal and vertical components are also shown.
• Graphs: Graphs the available quantities as functions of time in the Graph box left of the graphs controls.

1			After the interactive loads, deselect the VELOCITY, ACCELERATION, and FORCE vectors, and the VELOCITY X, and VELOCITY Y graphs. Reduce the VELOCITY of the mass to 0.5 m/s and the MASS to 1.5 kg. In what direction does the force of the mass point?
			A)	Always to the left.
			B)	Always to the right.
			C)	Always to upward.
			D)	Always to downward.
			E)	Always away from the center of the circular path.
			F)	Always toward the center of the circular path.
2			In what direction does the velocity of the mass point?
			A)	Always to the left.
			B)	Always to the right.
			C)	Always to upward.
			D)	Always to downward.
			E)	Always away from the center of the circular path.
			F)	Always toward the center of the circular path.
			G)	Always perpendicular to the force.
3			In what direction does the acceleration of the mass point?
			A)	Always away from the center of the circular path.
			B)	Always toward the center of the circular path.
			C)	Always perpendicular to the force.
			D)	Always in the opposite direction of the force.
4			What would happen to the force if I increase the velocity?
			A)	It will get larger.
			B)	It will get smaller.
			C)	It will not be affected.