Speed
A person walking covers 5.20 m in 10.4 s. How fast is the person moving?
0.5 m/s
What is true about a car with constant velocity?
it has zero acceleration
A horizontal (flat) line on a velocity vs. time graph shows ____ acceleration.
zero
Motion is a change in ___
Position
The horses on a carousel or merry-go-round are accelerating because ____.
the direction of the horses motion is constantly changing
A car travels a distance of 98 meters in 10 seconds. What is the average speed of the car?
9.8 m/s
A runner goes around a 1 mile track. If they end up at their starting position: What is their distance traveled?
1 mile
What does the slope of a distance vs. time graph tell you?
the speed of the object
The speed you read on a speedometer is called _______
Instantaneous speed
What are the 3 specific ways an object can accelerate?
speed up, slow down, change direction
A high-speed train travels with an average speed of 227 km/hr. The train travels for 2 hrs. How far does the train travel?
454 km
A runner goes around a 1 mile track. If they end up at their starting position:
What is their displacement?
0
Which statement about the movement of an object with zero acceleration could be true?
the object is moving at a constant speed
3 m/s North is an example of _____
velocity
A car goes from 16 m/s to 2 m/s in 3.5 s. What is the car's acceleration?
-4 m/s^2
If a car on cruise control moves at a speed of 50 mi/hr for 3 hours, how far did they travel?
150 mi
A car travels west for 240 km in 4 hr. What is the car's velocity?
60 km/hr west
When a car traveling at 30 m/s hits the gas pedal, it speeds up to 65 m/s in 3.5 sec. What is the car's acceleration during that time?
10 m/s^2
Acceleration is rate of change of ____.
velocity
A person walks 3 miles north, turns, and walks 2 miles east. Calculate the person's distance traveled and their displacement.
distance: 5 mi, displacement 3.61 mi NE
A group of bike riders took a 4 hour trip. During the first 3 hours, they traveled a total of 50 km, but during the last hour they traveled only 10 km. What was the group's average speed for the entire trip?
15 km/hr
A competitive go-cart driver is traveling 32 m/s. He sees a caution flag go up, so he slows at a rate of -1.5 m/s2 in 10.8 s. What is his final velocity?
15.8 m/s forwards
A car slowing down as it is approaching a red traffic light has a ____________________ acceleration; when the light turns green, the car's acceleration is ____________________.
negative; positive
The velocity of an object must include both a ____________________ and a ____________________.
speed; direction
A skateboarder is traveling 12 m/s down a hill. The skateboarder crashed and slid to a stop in 2.0 seconds. What was the rider's acceleration?
-6 m/s^2