Chapter 2 Review WS
Name ______Answer Key___________________________ Date ______
Period _______
1. Compare and Contrast the following pairs of vocabulary words.
a. Speed and velocity
-Both tell how distance changes with time.
-Velocity includes the direction
b. Distance and displacement
-Displacement is distance and direction from a starting point, distance is how
far an object is from something
- Both deal with how far an object is from something
c. Average speed and instantaneous speed
-Both describe rate of change in position
- Average speed refers to total distance moved divided by total time elapsed.
Instanteous speed refers to speed at a given point in time.
d. balanced force and net force
-balanced forces are forces on an object that cancel each other out. Net force is
the sum of all forces acting on an object.
- Both are dealing with forces.
e. force and inertia
-Force is a push or a pull that one body exerts on another. Inertia is the
tendency of an object to resist a change in its motion.
-Both are dealing with a force
f. acceleration and velocity
- Velocity is the speed and direction of an object. Acceleration is how the
velocity changes with time.
-Both deal with velocity
g. velocity and instantaneous speed
- Velocity is the speed and direction of an object. Instantaneous speed is how
fast an object moves at a given point in time.
-Both deal with speed
h. force and net force
- Force is a push or a pull. Net force is the sum of all forces acting on an object.
-Both deal with a force
i. force and acceleration
-Force is a push or a pull. Acceleration is the change in velocity of an object
when an unbalanced force acts upon it
-Both deal with forces.
2. What are you calculating when you divide total distance by the total time?
- Average Speed
3. What is the tendency for an object to resist any change in its motion called?
-Inertia
4. What is the proper unit of acceleration?
-m/s2 or m/s/s
5. What variables do you use to calculate acceleration?
-Velocity (initial and final) & time
6. What vocabulary word best describes the forces on an object with a net force of
zero?
-Balanced force
7. Define Speed.
-The amount of distance divided per unit of time.
8. In which of the following conditions does the car NOT accelerate?
a. A car moves at 80 km/h on a flat straight highway
b. The car slows from 80 km/h to 35 km/h
c. The car turns a corner
d. The car speeds up from 35 km/h to 80 km/g
9. A man drives 3 km east from home to the store and then 2 km west to a friends
house what is his displacement from his starting point at home?
-1 km east
10. Why would a passenger who is not wearing a seat belt be likely to hit the
windshield in a head-on collision?
-Their inertia keeps them moving at the speed the car was going before the
crash
11. Which of the following objects has the greatest inertia?
a. a car parked on the side of the road
b. a baseball during a pop fly
c. a computer sitting on a desk
d. a woman running on a track
12. A cyclist must travel 800 km. How many days will the trip take if the cyclist
travels 8 h/day at an average speed of 16 km/h?
-800 km/16 km/hr= 50 h
50 h/8 h/day= 6.25 days
13. A satellite’s speed is 10,000 m/s. After 1 min, it is 5,000 m/s. What is the
satellite’s acceleration?
- 5000 m/s – 10,000 m/s = -83.33 m/s2
60 s
14. A cyclist leaves home and rides due east for a distance of 45 km. She returns
home on the same bike path. If the entire trip takes 4h, what is her average speed?
- 45+ 45 = 90 km
90 km/4 h = 22.5 km/h
What is her displacement?
-0 km (she returned home)
15. Using the information from #14, when the cyclist returns, it took 30 minutes
longer than her trip east, although her total time was still 4 h. What was her velocity
in each direction?
- 45 km east/ 1.75 hr= 25.71 km/hr east
-45 km west/ 2.25 hr= 20 km/hr west
16. Which of the following represent the greatest speed? (hint convert them all to
m/s)
a. 20 m/s
b. 200 cm/s (2 m/s)
c. 0.2 km/s (200 m/s)
17. Acceleration can occur when a car is moving at constant speed. What must
cause this acceleration?
- A change in direction
18. The following data was obtained for 2 runners. Make a distance time graph that
shows the motion of BOTH runners.
Time (s)
Sally’s
Distance (m)
Alonzo’s
Distance (m)
a. Put Graph here:
1
2
2
4
3
6
4
8
1
2
2
4
b. What is the average speed of each runner?
-Sally 8 m/4= 2 m/s
-Alonzo 4m/4 s= 1 m/s
c. Which runner stops briefly?
-Alonzo
d. During what time interval does Sally and Alonzo run the same speed?
-Both run same speed from 3 to 4 seconds. (2 m/s)