Download 1. What is a vector quantity? Give an example?

Forces POD
Name ________________________________
1. What is a vector quantity? Give an example?
2. What is scalar? Give an example.
3. Harry Potter is racing through the giant maze at the end of the Tri-Wizard Tournament to with the
Tri-Wizard cup! He travels 5 meters East, 12 meters North, goes 2 meters West, and then another 6
meters North. What is the total distance that he travels? What is his total displacement?
4. What is the maximum possible resultant of two vectors with magnitudes of 3 and 8 units? The
minimum resultant?
5. Rochelle is flying to New York for her big Broadway debut. If the plane heads out of Los Angeles
with a velocity of 220 m/s in a northeast direction, relative to the ground, and encounters a wind
blowing head on at 45 m/s. What is the resultant velocity of the plane, relative to the ground?
6. a) What is the normal force?
b) Which way does it always point?
7. a) What is weight?
b) As a vector, what is always the direction?
8. In the diagram below, a box is at rest on an inclined plane. Which vector best represents the direction
of the normal force acting on the box?
a) A
b) B
c) C
d) D
9. What happens to the normal force if the object on which it is acting is on an incline?
10. If an object is at equilibrium then Fnet = ____.
11. A box of bagels is being pushed across the floor (moving in a straight line) and its speed is increasing:
a) is the box accelerating? how do you know?
b) draw a diagram and include the vectors Fa, FF ,FN & Fw
c) are all the forces equal in the x direction? _____ are all the forces equal in the y direction?
______
12. When an object is at equilibrium the sum of all the force vectors acting on the object equals zero.
When Fnet is zero, the object CANNOT be __________.
a) accelerating
b) at rest
c) moving at a constant speed
d) moving at a velocity that is constant
13. An object moving in a straight line increases its speed. What does this mean about the forces acting on
the object?
a) the forces acting on the object are balanced (Fnet = 0 N)
b) weight and normal force do not have the same magnitude
c) friction is greater than the force that opposes friction
d) the sum of all the force vectors acting on it are not zero
14. What is friction? What are the two types? How do we calculate it?
15. Unbeknownst to the students, every time the school floors are waxed, Mr. Tracy likes to slide down
the hallway in his socks. Mr. Tracy weighs 850 N and the coefficient of sliding friction between his socks
and the floor is 0.120. What is the force of friction that opposes Mr. Tracy motion down the hall?
102
16. Beethoven is trying to make his 70 kg Saint Bernard go out the back door but the dog refuses to walk.
If the coefficient of sliding friction between the dog and the floor is 0.50, how hard must Beethoven push
in order to move the dog at a constant speed?
350 N
17. If you throw a ball into the vastness of space, what will happen to the speed and direction of the ball
(hint: is there friction?)?
18. Your teacher has forgotten their coffee cup on the roof of their car and is traveling to school. What
will happen to the coffee cup in the following situations and explain why (use pictures if necessary):
a) your teacher slams on brakes to avoid the students running across the street
b) your teacher makes a quick right hand turn to return home to pick up forgotten papers
c) your teacher makes a quick left hand turn to avoid the long line of busses
19. If a motorcycle has four times as much mass as an scooter what does this mean about the inertia of the
motorcycle (compared to the scooter)?
20. After a cannon ball is fired into frictionless space, the amount of force needed to keep it going equals
_____.
a) on half the force with which it was fired
b) zero, since no force is necessary to keep it moving
c) the same amount of force with which it was fired
d) twice the force with which it was fired
21. If you hit a golf ball with a golf club, what is the reaction force? What is the action force? Is there a
force on both the ball and the club? Are the forces equal?
22. A bug is splattered on your windshield. Which force is greater?
a) the force of the bug on the windshield
b) the force of the windshield on the bug
c) both forces are equal
23. A high school student hits a nail with a hammer. During the collision, there is a force on
__________________.
a) the nail and the hammer
b) the nail but not on the hammer
c) the hammer but not on the nail
d) none of the above