QUIZ 4  Extra Credit   “Nota”  means none of the above

 

 

  1. When the speed  of an object is doubled, by what factor is the kinetic energy (KE)  changed ?    
  (a) 1/2 (b)  2  (c) 4 (d) nota

 

  2.  A what point in its motion is the PE (potential energy) of a pendulum a minimum?

  (a) at the highest point    (b) at the lowest point  (c) nota

 

  3. A what point in its motion is the KE (kinetic energy)  of a pendulum a maximum ?

  (a) at the highest point    (b) at the lowest point  (c) nota

 4. What produces the greater change in KE of  a box: exerting a 10-N force on the box for a distance of 5 m , or exerting a 25–N force on the box  for  a distance of 2.0 m ? Assume the force points in the same direction as the  motion.

 (a) exerting a 10-N force for a distance of 5 m    (b) exerting a 25–N force for a distance of 2.0 m     (c) both the same  (d) nota

 

5. Suppose a box experiences a net force of 12 N  over a distance of  5.0 m. The force points in the same direction as the motion. The change in KE is    

 

(a)  60 J  (b) 30 J  (c) - 60 J  (d) nota

 

6. Suppose a moving box experiences a net force of 12 N  over a distance of  5.0 m. If  the force points opposite the direction of the motion,  the change in KE is    

 

(a)  60 J  (b) 30 J  (c) - 60 J  (d) nota