### Practice test on velocity and acceleration

 Extra credit.  Print this and complete the questions and turn in for extra credit.  Must get 90% to receive credit.What is Motion? Solve the following problems. Show all your work. Remember to include the correct units. 1. A student practicing for a track meet ran 250 m in 30 sec. a. What was her average speed? b. If on the following day she ran 300 m in 30 sec, by how much did her speed increase? 2. A car traveled 1025 km frm El Paso to Dallas in 13.5 hr. What was its average velocity? 3. How fast was a plane flaying if it traveled 400 km in 30 min? 4. A student walks 10 blocks to a computer store (Assume all the blocks are equal length.) a. How long will it take him to reach the computer store if he walks 3 blocks in 2 min? b. What is his average velocity? 5. If the average speed a car is 45 km/hr, how far can it travel in 40 min? 6. The speed of light is 3 X 10 to 8th m/sec. How long does it take light to travel the 149 X 10 to 9th m distance from the sun to the Earth? 7. A driver starts his parked car and within 5 sec reaches a velocity of 54 km/hr as he travels east. What is his acceleration? 8. Falling objects drop with an average acceleration of 9.8 m/sec/sec/ or 9.8 m/sec to second. If an object falls from a tall building, how long will it take before it reaches a speed of 49 m/sec?

### What is Motion?

Multiple Choices Write the letter of the correct answer on the line at the left.

____________1. Which of the following are important in measuring motion?

a. Distance, time, speed
b. Velocity, acceleration, density
c. Distance, volume, speed
d. Acceleration, momentum, speed

____________2. The distance traveled by an object per unit time is called:

a. Velocity
b. Speed
c. Momentum
d. Acceleration

____________3. Motion is:

a. An increase in the speed of an object
b. A decrease in the speed of an object
c. The stopping of an object relative to a frame of reference
d. A change in position relative to a frame of reference

___________4. Find the speed of any object that covers 400 km in 5 hr.

a. 40 km/hr
b. 80km/hr
c. 2000 km/hr
d. 800 km/hr

___________5. Velocity is:

a. The same as speed
b. The same as acceleration
c. Speed in a specific direction
d. The same as momentum

___________6. Acceleration is the:

a. Rate of change in momentum
b. Rate of change in speed
c. Rate of change in velocity
d. Amount of time needed for an object to reach its destination

___________7. Deceleration is:

a. Negative velocity
b. Negative speed
c. Negative acceleration
d. Negative density

___________8. What is the acceleration of an object that takes 20 sec to change from a speed of 200 m/sec to 300 m/sec?

a. 5 m/sec
b. 5 m/sec/sec
c. 100 m/sec
d. 100 m/sec/sec

___________9. An object traveling at a constant 20m/sec in a circular path is changing its:

a. Speed
b. Momentum
c. Velocity
d. Mass

___________10. The object or point from which movement is determined is called:

a. Terminal velocity
b. Motion
c. Momentum
d. Frame of reference

#### Complete each statement on the line at the left.

___________1. The most common frame of reference is the _________.
___________2. The rate at which n object moves is called__________.
___________3. The distance-time graph for constant speed is a (an) _________time.
___________4. The momentum of an object can be found by multiplying its mass times its________.
___________5. The length between two places is called_________.

#### Determine whether each statement is true or false. If it is true, write T. IF it is false, change the underlined work or words to make the statement true.

___________ ______________1. Movement can be measured only in reference to something that is assumed to be fixed in place.
___________ ______________2. Speed that does not change is called average speed.
___________ ______________3. Speed equals acceleration divided by time.
___________ ______________4. In circular motion, the velocity of an object is constantly changing.
___________ ______________5. The distance-time graph for acceleration is always a straight line.

 1. How many meters can Swimmer 1 cover in 30 sec? ___________________________________ 2. How far will Swimmer 2 go in 30 sec? ___________________________________ 3. Predict the number of m Swimmer 1 can go in 60 sec. ___________________________________ 4. Predict the number of m Swimmer 2 can go in 60 sec. ___________________________________ 5. Which swimmer has the greatest speed? ___________________________________ 6. Calculate the speed of Swimmer 1. ___________________________________ 7. Calculate the speed of Swimmer 2. ___________________________________

### ESSAY

Write a brief paragraph discussing each of the following statements or questions.

1. In an amusement park you stand against the inside wall of a circular object that resembles a tin can. The circular object begins to whirl around. After a constant speed is reached, the floor drops down, but your are held fast against the whirling wall. Ate you being accelerated? Explain your answer.

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2. A 500-kg car proceeding at a speed of 100 km/hr is in a head-on collision with a 1500-kg pickup truck going 10 km/hr. The smaller car pushes the pickup truck back. Explain this situation.

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3. You are riding on a train going north and you see a car traveling north parallel to the train. Yet the car seems to be going backward. Explain this occurrence.

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4. Explain why the pilot of a plane must have precise measurement s of velocity.

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5. Explain why the slowing down of a moving object is considered to be a form of acceleration.

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