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# Acceleration

Acceleration is a vector quantity that represents the time-rate change in velocity
An airplane went from 100 m/s to 180 m/s in 2.0s. What was its acceleration? 40 m/s/s
If an object decreases its speed, then the vectors of velocity and acceleration __________. Opposite directions
If an object increases its speed, the the vectors of velocity and acceleration ____. Same directions
The initial speed of a bicycle at the top of a hill 3 m/s. The bicycle accelerates downhill at 1 m/s2 for 4.0 seconds. What is the bicyclist’s speed at the bottom of the hill? 7 m/s
What does the slope of a distance vs. time graph represent? speed
What does the slope of a velocity vs time graph represent? acceleration
What is the equation to find slope of a line? (y2-y1)/ (x2-x1)
What are the units for distance? meters
What are the units for time? seconds
what are the units for speed and velocity? m/s
What are the units for acceleration? m/s/s
What does the shape of an object speeding up look like on a distance vs time? a curve that gets steeper
What does the shape of an object slowing down look like on a distance time graph? a curve that gets less steep
What is the final velocity of a freely falling object 8 seconds after it is dropped? (g= -10m/s/s) -80 m/s
If you drop a bowling ball and coin at the same time in NASA's 8 story vacuum chamber (no air), which will hit the ground first? they hit at the same time
A ball is tossed straight up in the air. What is the speed of the ball when it's at its maximum height? 0m/s
A ball is tossed straight up in the air. What is the acceleration of the ball when it's at its maximum height? -9.8 m/s/s
During an experiment, an object is dropped from the sky and lands on earth but does not hit the earth at the calculated time. Why not? Air resistance inhibits the motion
When you drop an object, it accelerates downward because of ______________________. gravity
Gravitational attraction is lower on Mars than it is on Earth, therefore objects dropped on Mars would _______________. fall at a slower rate
A rock is thrown up with a velocity of 8 m/s. What is the rock’s velocity when it comes back down at the same height it was thrown? -8m/s
One characteristic of air resistance is ______________. opposes motion
How much velocity does a free falling object gain each second it falls down? 9.8 m/s
Created by: NISD Physics