Name:______Class:______Date:______
Projectile Motion Pre Test
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. When representing velocity as a vector,
a. the direction of the arrow shows the direction of motion.
b. the length of the arrow represents the speed.
c. the length of the arrow is drawn to a suitable scale.
d. All of the above
e. None of the above
____ 2. In order to find the components of a vector, you should
a. draw the vector with correct magnitude and orientation.
b. measure the sides of the rectangle.
c. draw a rectangle so that the vector is the diagonal.
d. All of the above
____ 3. In the absence of air friction, the vertical component of a projectile’s velocity doesn’t change as the projectile moves.
a. Always false
b. Always true
c. Sometimes true
____ 4. In the absence of air friction, the horizontal component of a projectile’s velocity doesn’t change as the projectile moves.
a. Sometimes true
b. Always true
c. Always false
____ 5. At what part of a path does a projectile have minimum speed?
a. When it returns to the ground
b. Halfway to the top
c. At the top of its path
d. When it is thrown
e. There’s not enough information to say.
____ 6. An object is dropped and falls freely to the ground with an acceleration of g. If it is thrown upward at an angle instead,
its acceleration would be
a. 0.
b. larger than g.
c. g upward.
d. g downward.
e. None of the above
____ 7. Jose can jump vertically 1 meter from his skateboard when it is at rest. When the skateboard is moving horizontally,
Jose can jump
a. same height.
b. higher.
c. lower.
Name:______ID: A
____ 8. If you could throw a baseball horizontally at a speed of 8 km/s and if there were no air drag and
nothing to stop it,
a. after 90 minutes it would return to you.
b. it would orbit Earth.
c. it would escape Earth’s atmosphere.
____ 9. A cannonball is fired at some angle into the air. In the first second it moves 5 meters horizontally.
Assuming it doesn’t hit the ground and air resistance is negligible, how far does it move horizontally
in the next second?
a. More than 5 m
b. Less than 5 m
c. 5 m
d. Not enough information
____ 10. A ball is thrown straight upward at 10 m/s. Ideally (no air resistance), the ball will return to the
thrower’s hand with a speed of
a. 0 m/s.
b. 5 m/s.
c. 10 m/s.
d. 20 m/s.
e. There is not enough information to say.
True/False
Identify whether the sentence or statement is true or false.
____ 11. A quantity that has both magnitude and direction is called a scalar.
____ 12. A quantity that has only magnitude is called a vector.
____ 13. The vector sum is called the resultant.
____ 14. The length of a vector represents its magnitude.
____ 15. The orientation of a vector shows its direction.
____ 16. When adding two vectors at right angles, the resultant of the vectors is the algebraic sum of the two
vectors.
____ 17. A single vector can be replaced by two vectors in the x- and y- directions that are at right angles to
each other. These two x and y vectors are called the resultants of the original vector.
____ 18. Any vector can be represented by two other vectors that are at right angles to each other.
____ 19. Mass is a vector quantity.
____ 20. Wind velocity can be represented as a vector quantity.
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