Study Guide: Motion.

The distance traveled by an object divided by the time it takes to travel that distance is called

B - Average Speed.

In order to determine speed, you must know

C - Both time and distance.

What is the speed of an object at rest?

B - 0 km/h

The difference between speed and velocity is that velocity includes

A - Direction.

An airplane is flying at 635 km per hour at an altitude of 35 000 m. It is currently over Kansas and is approximately 16 minutes ahead of its scheduled arrival time. What is its velocity?

D - Direction cannot be determined.

Which of the following does not indicate velocity?

D - 28 km from Los Angeles to Catalina Island.

Acceleration is defined as the change in velocity divided by

C - Time.

The SI unit for acceleration is

C - m/s^2

On a velocity-time graph, a line with a negative slope indicates that the object is

B - slowing down.

When the velocity of an object changes, it is acted upon by a(n)

A - Force.

An object is in motion when

D - the object changes position relative to a stationary reference point.

Which of the following is a displacement?

D - 3 blocks east.

If the slope of a line on a distance-time graph is 1, the speed of the object being plotted is

C - Increasing.

Which straight-line acceleration indicates an increase in speed?

C - 4 m/s^2

Which of the following speeds is the most accurate?

D - 100 miles per second.

Velocity describes both speed and ____________________.

Direction

Acceleration can be determined from a velocity-time graph by calculating the

slope of the line

If a cyclist moves at a constant speed of 5.1 m/s, he travels a distance of _________________ every second.

5.1 meters

On a distance-time graph, time is usually the _________ variable.

Independent.

Displacement is the change in __________ of an object.

Position.

The measurement 82 km/h southeast is a measurement of ____________

Velocity.

If you are riding on a northbound train and you walk southbound down the aisle, your ____________ velocity is less than the velocity of the train.

Resultant Velocity.

A person on a skateboard accelerates at a rate of 1.5 m/s2. This rate means that she is moving 1.5 meters

per second.

The symbol Av represents

change in velocity (A=change, V= velocity)

During a race, a sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25 s. What is the sprinter's average acceleration during this period?

2 m/s^2

You have two photos of a person walking. One shows the person at the corner of Third and Main streets, the other shows the person at the corner of Tenth and Main streets. There are lampposts at every corner in this town, and the first picture shows it to be 10:32:00 exactly. The second picture shows it to be 10:49:30. You know three facts: (l) All of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross Main in this area are numbered consecutively, with no interruptions. What is the person's average speed in kilometers per hour?

2 km/h.

The winning time for a 500.0 mile circular race track was 3 hours and 13 minutes. What was the driver's average speed? What was the driver's average velocity?

V= 155.42 mph

A car moving at a speed of 20 m/s accelerates at a rate of —4 m/s^2 to a complete stop. How long does it take the car to stop?

5 Seconds.

A boat moves at a speed of 15 km/h in still water. The river it is traveling in flows at a rate of 3 km/h
downstream. What is the velocity of the boat if it travels downstream? What is the velocity of the boat if it travels upstream?

3 km/h

V = s(displacement)/t(ime)

S = d(istance)/t(ime)

A= v - u / t(ime)

V = Final Velocity. U= Initial Velocity