Chapter 3 Physics Review

True of False Questions

1. The horizontal component of velocity for a projectile varies with time, even with no air resistance.
2. A quantity that has both magnitude and direction is called a scalar.
3. Wind velocity can be represented as a vector quantity.
4. The vertical component of velocity for a projectile varies with time, even with no air resistance.
5. A single vector can be replaced by two vectors in the X and Y directions. These X and Y vectors are called the resultant of the original vector.
6. The vector sum is called the resultant.
7. Wind velocity  can be represented as a vector quantity.
8. When adding two vectors at right angles, the resultant of the vectors is the algebraic sum of the two angles.
9. The length of the vector represents its magnitude.
10. The orientation of a vector shows its direction.

Solve the following problems:

1. While Dexter is on a camping trip with his boy scout troop, the scout leader hands each boy a compass and map. The directions on Dexter’s map read as follows: “Walk 500.0 m north, 200.0 m east, 300.0 m south, and 400.0 m east. If he follows the map, what is Dexter’s displacement? Solve graphically.
2. Ivan pulls a sled loaded with logs to his cabin in the woods. I Ivan pulls with a force of 800N in a direction 20.0 degree above the horizontal, what are the horizontal and vertical components of the force exerted by Ivan?
3. In her physics lab, Melanie rolls a 10-g marble down a ramp and off the table with a horizontal velocity of 1.2 m/s. The marble falls in a cup placed 0.51 m from the table’s edge. How high is the table?
4. At a meeting of physics teachers in Montana, the teachers were asked to calculate where a flour sack would land if dropped from a moving airplane. The plane would be moving horizontally at a constant speed of 60.0 m/s at an altitude of300. m. a)If one of the physics teachers neglected air resistance while making his calculation, how far horizontally from the dropping point would he predict the landing? B) Draw a sketch that shows the path the flour sack would take as it falls to the ground(from the perspective of an observer on the ground and off to the side.)
5. A boat is rowed at 6.0 km/h directly across a river in water that is flowing at right angles at 8.0 km/h. What is the resulting speed of the boat?

Multiple choice questions

1. A vector is a quantity that has a) magnitude and time b) magnitude and direction c) time and direction
2. When velocity is represented as a vector, a) the length of the arrow represents the speed.b) the length of the arrow is drawn to a suitable scale. C) the direction of the arrow shows the direction of motion d) all of the above
3. What is the minimum resultant possible when adding a 3-unit vector to an 8-unit vector?a) 24 b) 11 c) 8 d) 5
4. What is the maximum resultant possible when adding a 3 unit vector to an 8-unit vector? A) 24  b) 11  c) 8  d) 5
5. An airplane flying into a head wind loses ground speed, and an airplane flying flies at right angles to the wind, then ground speed is a) less b) unchanged c) more
6. The horizontal component of a projectile’s velocity is independent of a) the vertical component of its velocity. B) the range of the projectile. C) time
7. Which of the following would not be considered a projectile? A) a cannonball thrown through the air b) a cannonball rolling down the slope c) a cannonball thrown straight up