2. A toy racing car moves with constant speed around the circle shown below. When it is at point A, its coordinates are x = 0, y = 3m and its velocity is (6m/s)i. When it is at point B its velocity and acceleration are: 1) (6 m/s)j and (12 m/s2)i, respectively 2) (6 m/s)i and (12 m/s2)i, respectively 3) (6 m/s)j and (12 m/s2)i, respectively 4) (6 m/s)i and (2 m/s2)j, respectively 5) (6 m/s)j and 0, respectively

3. A rider in a "Barrel O’ Fun" finds herself stuck with
her back to the wall. Which diagram correctly
shows the forces acting on her?

4. A car is traveling at a constant speed along the road ABCDE shown in the drawing. Sections AB and DE are straight. Rank the accelerations in each of the four sections according to magnitude, smallest first. 1) all tie 2) AB & DE tie, BC, CD 3) AB & DE tie, CD, BC 4) CD, BC, AB & DE tie 5) BC, CD, AB & DE tie

5. If the Rotor initially moves at the minimum required speed for the rider not to fall and then its speed is increased, do the following increase, decrease, or remain the same: (a) the magnitude of fs; (b) the magnitude of N? 1) (a) increase (b) increase 2) (a) remain the same (b) remain the same 3) (a) remain the same (b) increase 4) (a) remain the same (b) decrease 5) none of the above

6. In the figure below, suppose the car is on the verge of sliding when the radius of the circle is R. If we double the car's speed, what is the least radius that would now keep the car from sliding? 1) R/4 2) R/2 3) R 4) 2R 5) 4R

7. A penny is placed on a rotating turntable
A penny is placed on a rotating turntable. Where on the turntable does the penny require the largest centripetal force to remain in place? 1) at the edge of the turntable 2) at the center of the turntable 3) it is the same everywhere on the turntable

8. In a game of tetherball, a ball is tied to a pole with a string
In a game of tetherball, a ball is tied to a pole with a string. While the ball whirls around the pole, in what direction is the acceleration of the ball (at the moment shown?)

9. A mass is hanging from a rope and swinging around a circular path at constant speed. The situation is shown in the figure. Which of the pictures show the forces on the mass (neglect air resistance)?

10. A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by 1) keeping the speed fixed and increasing the radius by a factor of 4. 2) keeping the radius fixed and increasing the speed by a factor of 4. 3) keeping the radius fixed and increasing the period by a factor of 4. 4) keeping the radius fixed and decreasing the period by a factor of 4. 5) keeping the speed fixed and decreasing the radius by a factor of 4.

11. A particle moves at constant speed in a circular path
A particle moves at constant speed in a circular path. The instantaneous velocity and instantaneous acceleration vectors are: 1) both tangent to the circular path 2) both perpendicular to the circular path 3) perpendicular to each other 4) opposite to each other 5) none of the above

12. A certain string breaks when it is under 400 N of tension
A certain string breaks when it is under 400 N of tension. A boy uses this string to whirl a 10 kg stone in a horizontal circle of radius 10 m. The boy continuously increases the speed of the stone. At approximately what speed will the string break? 1) 10 m/s 2) 20 m/s 3) 80 m/s 4) 100 m/s 5) 400 m/s

13. A 0.25-kg ball attached to a string is rotating in a horizontal circle of radius 0.5 m. If the ball revolves twice every second, what is the tension in the string? 1) 2 N 2) 5 N 3) 7 N 4) 10 N 5) 20 N

14. A car is going around a banked curve at a high rate of speed
A car is going around a banked curve at a high rate of speed. For the car not to skid, in
which direction does the frictional force act?
A) Up the plane.
B) Down the plane.
C) Directly towards the center of the curve.

15. Jill swings on a vine 5m long
Jill swings on a vine 5m long. What is the tension in the vine if Jill, mass 60 kg, is moving at 2.5 m/s when the vine is vertical?
A) 514 N
B) 589 N
C) 664 N
D) 75 N
Clicker Qs, Quiz, Finish Simulation, Complete 1 -5