Chapter Vocabulary
Motion With Constant Acceleration
Acceleration vs. Velocity
Accelerated Motion
Free Fallin'
100
The area under a velocity time graph is the ________.
Displacement.
100
A car with a velocity of 30 m/s is accelerated uniformly at the rate of 2.0 m/s2 for 10 s. What is its final velocity?
50 m/s
100
Can a car traveling on an interstate highway have a negative velocity and a positive acceleration at the same time? Explain.
Yes, a car's velocity is positive or negative with respect to its direction of motion from some point of reference. A positive acceleration with a negative velocity would imply the car is traveling in the negative direction and slowing down.
100
This is the slope of the line tangent to the curve of a velocity-time graph at a particular instant in time.
What is instantaneous acceleration
100
What is the acceleration due to gravity?
-9.8 m/s2
200
The term used to describe a falling object for which air has no appreciable effect on its motion.
What is free fall.
200
Find the uniform acceleration that causes a car's velocity to change from 27 m/s to 45 m/s in a 6.0-s period.
3.0 m/s2
200
True or False. Can the velocity of an object change if the acceleration is constant? Give an example or counterexample.
Yes. Dropping a book. The longer it drops the faster it goes but the acceleration is constant.
200
A ball falls freely from rest for 15.0 s. Calculate the ball's velocity after 15.0 s.
-147 m/s
200
A stone that starts at rest is in free fall for 8.0s. What is the stone's displacement during this time?
-313.6 meters
300
Acceleration describes a change in ________.
Velocity.
300
If a car is traveling 100 km/hr and comes to a stop in 3.0 min, what is the car's acceleration in m/s2?
-0.15 m/s2
300
A race car is moving at a constant velocity of 25 m/s for 15 seconds. What is the cars acceleration?
Zero. Objects traveling at a constant speed are not accelerating!
300
How far does a car travel in 30.0 s while its velocity is changing from 50.0 m/s to 80.0 m/s at a uniform rate of acceleration?
What is 1950 meters
300
You throw a beanbag in the air at 15.0 m/s. How far did it travel before reaching its maximum height?
11.47 meters
400
You did it !!
400
A car is accelerated uniformily at the rate of 0.50 m/s2 for 1.0 s. Its final velocity is 23 m/s. What is the initial velocity?
22.5 m/s
400
Does a car that is slowing down always have a negative acceleration? Why? Give an example or counterexample.
No, if the positive axis points in the direction opposite the velocity, the acceleration will be positive. If a car is traveling in the negative direction, only a positive acceleration will slow it down. A negative acceleration will cause an increase in speed.
400
If a car is traveling 100 m/s and comes to a stop in 3.0 min, what is the car's acceleration?
- 0.55 m/s2
400
You throw a ball downward from a window at a speed of 2.0 m/s. How fast will it be moving when it hits the sidewalk 2.5 meters below?
7.3 m/s
500
The _____ ______ of an object is the slope of its velocity-time graph.
Average acceleration.
500
What is the minimum length runway needed to accommodate airplanes that can accelerate uniformly at 2.7 m/s2 and must reach a ground velocity of 64 m/s before they can take off?
758 meters
500
What is acceleration? (Described in terms of velocity)
Acceleration is the rate of change of velocity. How much the velocity changed divided by how long it took the change to occur.
500
A tennis ball is dropped from 1.5 m above the ground, touches the ground for 0.008 s and rebounds to a height of 0.75 m. What is the ball's velocity when it hits the ground?
-5.42 m/s
500
If you throw a ball upwards out of a window at 2.0 m/s. How fast will it be moving when it hits the sidewalk 2.5 meters below?
7.3 m/s