Vocabulary 1
The measurement of the change in velocity over time.
Acceleration
A change in an object's position.
Motion
Quantity of magnitude, but does not include direction.
Scalar
A girl travels 20 miles on her bicycle. The trip takes 2 hours. What is her speed?
10 mph
A ball rolls down a ramp for 15 seconds. If the initial velocity of the ball was 0.8 m/s and the final velocity was 7 m/s, what was the acceleration of the ball?
0.413 m/s2
Total distance divided by the total time
Average Speed
How fast something is. Distance divided by time.
Speed
The place that something is located.
Position
A car starts from a spotlight and is traveling with a velocity of 10 m/s east in 20 seconds. What is the acceleration of the car?
0.5 m/s2
A man walks 7 km in 2 hours and 2 km in 1 hour in the same direction. What is the man's average velocity for the whole journey?
3 km/hr
The distance an object is from its starting point. Final position - initial positon.
Displacement
Some sort of non-moving fixed object with respect to the observer that the observer can use to detect motion.
Frame of Reference/Reference point
The system of measures used in the majority of countries around the world, but not the United States.
Metric
Speed of a rocket that travels 9,000 meters in 12.12 seconds?
742.57 m/s
A man walks 7 km East in 2 hours and then 2.5 km West in 1 hour. What is the man's average velocity for the whole journey?
1.5 km/hr
Distance
The system of measures used in the United States
Customary
The ability to see or be aware of something by observation.
Perception
How long will your trip take (in hours) if you travel 350 km at an average speed of 80 km/hour.
4.38 hours
You start walking from a point on a circular field of radius 0.5 km and 1 hour later you are at the same point. What is your average velocity for the whole journey?
If you walk around a circular field and come back to the same point where you started the displacement, which a change in position, is equal to zero. Since the displacement is equal to zero, the average velocity is also equal to zero.
A measure that includes both magnitude and direction.
Vector
Change in displacement over time. The speed of an object in a certain direction.
Velocity
Displacement, Velocity, and Acceleration are considered this type of quantity.
Vectors
How many seconds will it take for a satellite to travel 450 km at a rate of 120 m/s?
3,750 seconds
A ball is rolled at a velocity of 12 m/s. After 36 seconds, it comes to a stop. What is the acceleration of the ball?
-0.33 m/s2