QUIZ 2  Nota means none of the above

 

  1. If it takes 2 N to push horizontally on your book to make it slide at constant velocity, then what is the friction force ?

(a) 0 N   (b) 1 N  (c) 2 N  (d)  nota

 

  1. Gravity on mars is only ¼  as strong as gravity of the earth. What is the weight of  a
    10 kg object on the planet Mars ?


(a)  98 N  (b) 24. 5 N  (c) 0.98 N  (d) nota

 

  1. A falling object weighing  10 N and has reached its terminal velocity. What is the magnitude of the upward force of air resistance?

         (a)  0 N  (b) 20 N  (c) 10 N  (d) nota


       4.  What is the acceleration of a 40 –kg block of cement pulled sideways with a force of 800 N?


    (a)   2 m/s2   (b) 20 m/s2   (c) 200 m/s2     (d) nota

 

   5. What is the acceleration of a skydiver when the air resistance force builds up to one-fourth her weight?

(a)     g/4  (b) g/2  (c)  3g/4  (d) nota

 

  6. A baseball bat hits a ball with a  force of 1000 N. The force of the ball on the bat is

(a) less than 1000 N      (b)  more than 1000 N  (c)   equal to 1000 N    (d) nota

 

  7.   The Earth pulls down on an apple with a force of  10 N. The force of the apple  on the Earth

  is
  (a) less than 10 N      (b)  more than 10 N  (c)   equal to 10 N    (d) nota

 

  8.  If you stand next to a wall on a frictionless skateboard and push the wall with a force of 60 N, how hard does the wall push on you?

(a) 60 N   (b)  0 N    (c) 120 N  (d) nota

 

  9. In the previous problem, if  your mass is 60 kg, what is your acceleration ?

(a) 0  m/s2.    (b) 1  m/s2   (c) 2  m/s2   (d) nota


 10.   Forces of 3 N and 4 N act at right angles on a block . What is the magnitude of the net force F?






(a) 7 N     (b) 12 N     (c) 5 N  (d) nota