Summary

• Projectiles
• Law of inertia
• Newton's second law

• Written Quiz    Timer
  
  
• Reading Quiz
  
  
• Newton's Second Law
  • 
  • Weight and mass
  • free body diagrams
    Example #1
  • applet
  • Interactive Example 5-4
  • Interactive Figure 5-9
  
  

wk4
Reading quiz What happens to the acceleration of a cart on a frictionless table if its mass is doubled but the pulling force remains constant?
A. It is quadrupled.
B. It is doubled.
C. It is cut in half.
D. It is cut to a fourth.
Answer
















What is the frictional force acting on a 4.5-kg wagon if it accelerates at +1.2 m/s² under an applied force of +8.2 N?
A. +5.4 N
B. −6.0 N
C. −2.8 N
D. +1.82 N
Answer















 



C. It is cut in half.






















 



C. −2.8 N