Chapter 5: A Mathematical Model of Motion

Take home quiz

       

 1. What value is calculated by dividing rise by

run? 

  a.   the slope of a straight line  

  b.   acceleration of a moving object exhibiting uniform motion  

  c.   angular velocity  

  d.   length of a straight line  

       

 2. Which of the following equations can be used to find the position of an object moving at constant

velocity? 

  a.   d = d0 - vt  

  b.   Δd = d1 - d0  

  c.   tan ϑ = Ry/Rx  

  d.   d = d0 + vt  

       

 3. You drive a car for 2.0 h at 60 km/h, then for another 3.0 h at 85 km/h. What is your average

velocity? 

  a.   73 km/h  

  b.   75 km/h  

  c.   75 km/h2 

  d.   - 73 km/h  

       

 4. What is the minimum length runway needed to accommodate airplanes that can accelerate

uniformly at 2.7 m/s2 and must reach a ground velocity of 64 m/s before they can take off?  

  a.   1.5 × 102 m  

  b.   1.5 × 103 m  

  c.   7.7 × 102 m  

  d.   7.7 × 103 m  

       

 5. You and a friend leave school at the same time. You drive at a constant 55 km/h and your friend

drives 70 km/h. How long does it take each car to reach a mall that is 25 km from the school? 

  a.   you: 1 hour 40 minutes, your friend 36 minutes  

  b.   you: 2.2 hours, your friend: 2.8 hours  

  c.   you: 22 minutes, your friend: 27 minutes  

  d.   you: 27 minutes, your friend: 22 minutes  

6. __________ means that equal displacements occur during successive equal time intervals.  

  a.   Uniform acceleration  

  b.   Uniform motion  

  c.   Average speed  

  d.   Average acceleration

 7. You and a friend each walk 8.0 km. You walk at 6.4 km/h; your friend walks 8.1 km/h. How long

will your friend wait for you at the end of the walk? 

  a.   30 minutes  

  b.   1.7 h  

  c.   0.5 h  

  d.   15 minutes  

 8. A tennis ball is dropped from 1.5 m above the ground, touches the ground for 0.008 s and rebounds

to a height of 0.75 m. What is the ball's velocity when it hits the ground? 

  a.   -5.4 m/s  

  b.   -3.8 m/s  

  c.   3.8 m/s2 

  d.   -5.4 m/s2 

 9. Find the uniform acceleration that causes a car's velocity to change from 27 m/s to 45 m/s in a 6.0-

s period. 

  a.   3.0 m/s  

  b.   18.0 m/s2 

  c.   3.0 m/s2 

  d.   18.0 m/s  

 10. How far does a car travel in 30 s while its velocity is changing from 50 km/h to 80 km/h at a

uniform rate of acceleration? 

  a.   252 m  

  b.   1.08 × 103 m  

  c.   540 m  

  d.   1.95 × 103 m