Vocabulary
Any change in the speed or direction of an object
Acceleration
The following line graph shows an object’s distance over time.
w------------------x
Which claim describes what is happening to the object between points W and X?
a. It is not moving.
b. It is speeding up.
c. It is slowing down.
d. It has acceleration.
A
To make sure your measurements are clear, it is important to use appropriate units. Which of these is a unit of time?
kilogram milliliter
meter minute
Minute
The speed of an object in a particular direction is
Velocity
Forces can affect the rate of an object’s motion. Which of these is a force?
a. acceleration c. speed
b. friction d. velocity
b. Friction
Benny drops a ball off a bridge. Which claim describes what happens to the ball as it falls?
A. Its speed and position stay the same.
B. Both its speed and position change.
C. Its speed decreases, but its acceleration increases.
D. Its speed increases, but its acceleration decreases.
B. Both its speed and position change.
To make sure your measurements are clear, it is important to use appropriate units. Which of these is a unit of speed
A. grams per liter (g/L)
B. miles per hour (mph)
C. liters per minute (L/min)
D. hours per kilogram (hr./kg)
B. miles per hour (mph)
The location of an object in relation to another object or place
Position
Astronauts in outer space float because one of the forces we experience on Earth is very small in space. Which force is it?
A. gravity c. velocity
b. friction d. acceleration
gravity
Three students are in a race. The students’ starting points and the finish line are shown in the following diagram.
A -----------------------5m/s
B------------------------4m/s
c 6m/s
Based on the evidence, which runner will win the race?
A. Runner A will win the race.
B. Runner B will win the race.
C. Runner C will win the race.
D. It will be a three-way tie.
C. Runner C will win the race.
A train travels 200 km in the same direction in 2 hr. What is this train’s speed?
Speed = Distance / Time
a. 2 km/hr c. 200 km/hr
b. 100 km/hr d. 400 km/hr
b. 100 km/hr.
Velocity and speed are both measurements describing an object’s motion. What is a difference between velocity and speed?
a. Speed depends on acceleration, but velocity does not.
b. Speed does not depend on direction, but velocity does.
c. Speed depends on velocity, but velocity does not depend on speed.
d. Velocity only depends on friction, but speed only depends on gravity.
b. Speed does not depend on direction, but velocity does.
Mani traveled by car from Tallahassee to Pensacola. Each of the following statements about Mani’s car is true. Which statement describes the car’s velocity?
A. The car is traveling west at 80 km/hr.
B. The car has stopped for gas at a service station.
C. The car is traveling at the speed limit posted on the highway.
D. The car is moving faster than any other car on the highway.
A. The car is traveling west at 80 km/hr.
Three trains travel from different directions and head toward the same destination. All left at the same time, and each travels at the same speed the entire time.
Which train will reach the destination first?
A. Train A will be first.
B. Train B will be first.
C. Train C will be first.
D. All three trains will reach the destination at the same time.
D. All three trains will reach the destination at the same time.
Kinan ran for 1 mi at a speed of 8 min/mi. How long did it take Kinan to run 4 mi at the same rate?
a. 2 min c. 32 min
b. 8 min d . 64 min
c. 32 min
Whitney walks from her house to school, a distance of 1 mi. It takes her 14 min. How long will it take Whitney to walk home from school if, on her way, she walks at a rate of 1 mi/7 min?
7 min 21 min
14 min 28 min
7 min
Three people travel in their cars heading toward the supermarket. All left at the same time and each travels at the same speed the entire time. The velocity and distance of each car are shown.
Car A------10km--- 60km/hr
Car B-----9km---- 80km/hr
Car C------10km---80km/hr
Which car will reach the supermarket first?
A. Car A will be first.
B. Car B will be first.
C. Car C will be first.
D. All the cars will reach the supermarket at the same time.
B. Car B will be first
Ashwath walked for 3 hr at a speed of 10 km/hr. How far did Ashwath walk?
a. 3 km c. 30 km
b. 10 km d. 300 km
c. 30 km