Vector/3 Laws Test Tip Sheet

Definitely study your vector quiz. Of course, study old H.W.s and notes. Try making flash cards. Study with a friend. 

Practice questions online at Forces Review AND http://www.123physics.com/

1. Know how to find resultants when the angle between the forces are :

1a) Know how to draw resultants and equilibrants (tail to tail & head to tail)

Tail to Tail	Head to Tail

2. What angle between forces produces the greatest resultant? _____smallest resultant _______

3. Be able to find horizontal and vertical components. Ex) 6 N 35 degrees south of east. Draw it and use trigonometry to find Fx and Fy (horizontal and vertical components)

4. Draw a force so its vertical component is at its maximum possible value. Now change the angle so that is has the largest possible horizontal component.

Largest Vertical Component?             Largest Horizontal component?

5) What happens to the size of each component when you change your force angle from 30 to 45 degrees?

6. When the angle a vector makes from the horizontal increases, its horizontal component of the force

______________ and the vertical component _____________

7.  Could the forces 8 N, 4 N and 2N ever be in a state of equilibrium?

8. Know F=ma plugin questions. Also 2 step F=ma problem. First find Fnet (resultant), then use F=ma,

9. How much more inertia does a 10 kg mass have than a 2 Kg?.

10. What makes the world go 'round? (according to Newton, that is!!)

11. Carefully draw all the forces on a box on the ground and on an incline. Study all free body diagrams.

Box pulled to the right with constant velocity	Box at rest on an incline

12. There are about 3 to 4 third law questions. Know examples.

"When object A exerts a force on object B, _______________________________________

13. A HUGE St. Mary's hockey player checks a tiny Portledge hockey player. Compare each players':
Third Law

• Acceleration
  Smaller Player - _______________ - Larger Player - _____________

• Pain
  Smaller Player - _______________ Larger Player - _____________

• Potential Bodily damage !!!
  Smaller Player - _______________ Larger Player - _____________

• Force each exerts on other
  Smaller Player - _______________ Larger Player - _____________

14. A man pushes a wagon with a force of 20 N and an angle of 60 degrees. Which component of this force actually is responsible for moving the wagon? Calculate this component. (Use trig.) [ Perpendicular Components Animation ]

Note: Picture is not drawn to scale