Unit 1 Exam Review

Modified True/False
____ 1. Two siblings leave their house and walk to the same school taking different routes. One of the routes is farther, but the siblings take the same time to reach the school. It can be said that the two siblings have the same average velocity but different average speeds. _________________________
____ 2. For the following quantities, these are considered to be vectors: displacement, acceleration. _________________________
____ 3. During an interval of uniform acceleration, the average velocity over the entire interval is equivalent to the instantaneous speed at the midpoint of the interval. ___________________________________
____ 4. A rubber ball changes velocity from 6.5 m/s [down] to 6.5 m/s [up] in a time of 2.0 s. Its average acceleration during this period can be considered to be zero. _________________________
____ 5. The acceleration due to gravity on Earth varies according to both altitude and latitude. _________________________
____ 6. To achieve maximum range across a horizontal surface, the angle at which a projectile must be launched is 90°. _________________________
____ 7. Forces of tension always act vertically upward. ______________________________
____ 8. When forces acting on an object are in equilibrium, the object can still be moving. _________________________
____ 9. The same forces act on two objects having different masses. The more massive object will experience the greater acceleration provided the forces are not “balanced.” ______________________________
____ 10. For two given surfaces, the coefficient of static friction is generally greater than the coefficient of kinetic friction. _________________________
____ 11. For an object sliding along a ramp, the force of kinetic friction acting on the object increases as the angle of inclination of the ramp increases.