science speed and acceleration study guide

what is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10 km race

km/hr

the relationship among speed,distance, and time is

v=d/t

3 m/s north is an example of a

velocity

acceleration is rate of change of

velocity

give an example describes constant acceleration due ONLY to a change in direction

windmill

the equation used to find acceleration is a=

(vf-vi)/t

a cross country runner runs 10km in 40 min. what is his average speed

.25 km/min

a person walks 1 mile everyday for exercise leaving her front porch at 9 am and returning to her front porch at 9:25. what is the total displacement of her daily walk

0

a distance time graph indicates that an object moves 100 m in 4 s and then remains at rest for 6s. what is the average speed of the object

10 m/s

during a race, a runner runs at a speed of 6 m/s. 2s later she is running at a speed of 10m/s. what is the runners acceleration?

2 m/s2

what is the speed of a bobsled whose distance time graph indicates that it travels 100 m in 25s

4 m/s

a ball is rolled uphill a distance of 5 meters before it slows stops and begins to roll back. the ball rolls downhill 9 meters before coming to a rest against a tree. what is the magnitude of the balls displacement

4 meters

a car traveled 60 km in 2 hrs 84 km in the next hr and then 68km in 2hrs before reaching its destination. what is the cars average speed

42.4 km/hr

a high speed train travels with an average speed of 227km/hr. the train travels for 2 hrs. how far does the train travel

454 km/hr

a truck travels to and from a stone quarry that is located 2.5 km to the east. what is its distance, displacement?

5 km, 0

if you ride your bike at an average speed of 4 km/hr and need to travel a total distance of 28 km, how long will it take you to reach your destination

7hrs

find the acceleration of a car that goes from 32 m/s to 96 m/s in 8s

8 m/s2

suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1s. What is your acceleration

a=2m/s2

An object moving at 30 m/s takes 5s to come to a stop. What is the objects acceleration

a=6m/s2

the rate at which velocity is called

acceleration

instantaneous speed is measured

at an instant

motion is a change in

change in position

a train approaching a crossing changes speed from 25 m/s to 10 m/s in 240s. How can the trains acceleration be described

deceleration

a merry-go-round horse moves at a constant speed but at a changing

direction

two cars start at the same point and drive in a straight line for 5 km. at the end of the drive their distance are the same but their displacement are different. how?

going in a different direction

if your ride your bicycle down a straight road for 500 m then turn around and ride back, your distance is ___ your displacement

greater than

the speed you read on a speedometer is

instantaneous speed

if you ride your bike uphill then ride it down the other side, your acceleration is

negative, positive

give an example that identifies a change in motion that produces acceleration

plane taking off

what is something you could most accurately measured with a ruler

shoe

a car has an acceleration of -5 m/s2. the cars motion is best described as ____

slowing down

an object that is accelerating may be ______, _______, or ______

speed up, slow down, and changing direction

an inline skater is skating around a parking lot can have constant ___ but changing ____

speed, direction

a horizontal line on a distance time graph means the object is

stopped

a person drives north 6 blocks then turns west and drives 6 blocks. the driver then turns south and drives 6 blocks. how could the driver have made the distance shorter while maintaining the same displacement

west 6 blocks