Definitions
Speed Practice
Acceleration Concepts
Acceleration Practice
Gravity
100
Define Speed
Speed is the change of distance of an object over a certain amount of time.
Speed =
Delta position div Delta time
100
A cheetah traveled 30 meters in 5 seconds. what is the speed of the cheetah in meters per second
Speed = 6 frac{m}{s}
100
If a person goes from rest to 10 m/s over 5 seconds, what is their acceleration?
2 m/s2
100
A ball goes from rest (0 m/s) to 25 m/s in 5 seconds. What is the acceleration of the ball?
5 m/s/s or 5 m/s2
100
True or False: Gravity makes all objects accelerate as they free fall
True
200
Define acceleration
Acceleration is the change of speed of an object over a change of time
A= frac{Delta speed}{Delta Time}
200
A person ran 26 miles in 2.1 hours. How fast did they go in miles per hour?
Speed =12.38 miles per hour
200
True or False: Acceleration only describes an increase in speed.
False- Acceleration describes increases and decreases in speed
200
As a runner runs a 100m dash, they accelerate from 5m/s to 12 m/s over 3 seconds. What is the acceleration in m/s2
2.33 m/s2
200
What is gravity?
Gravity is a force of attraction between two objects due to their mass
300
Define Gravity
Gravity is a force of attraction between two objects due to mass
300
A car drove 35 miles in 20 minutes. What is the car's speed in miles per hour?
(1 hour=60 minutes)
105 miles per hour
300
Units of speed show distance over time, such as m/s (meters per second). What does the unit for acceleration look like?
distance/time/time
distance/time2
m/s2
300
A driver presses on the breaks and forces a car to go from 50 miles per hour down to 20 miles per hour over 9 seconds. What is the acceleration of the car in miles per hour per second
A= frac{20-50}{9}= frac{-3.33 mph}{sec}
300
True or false: All objects, no matter their weight or mass, fall at the same speed/acceleration due to gravity.
True
400
What is the actual value of the acceleration of gravity?
G=9.8 frac{m}{s^2}
400
A jet fighter can travel 3000 miles in 4 hours. How fast is this jet fighter in miles per hour
750 miles per hour
400
How can we calculate speed in terms of acceleration and time?
Speed = a xx t
400
A car driving at 40m/s brakes until it comes to a rest 6.7 seconds later. What is the car's acceleration?
A= 0-40/6.7= -5.97 m/ss
400
If an object starts at rest (0 m/s) and falls for 5 seconds, what is its speed after 5 seconds?
Speed = a x t
Speed = 10 (or 9.8) x 5
Speed = 50 m/s or 49 m/s
500
When graphing position vs time on a graph, what does slope represent?
Speed
500
The world's fastest vehicle can cover 1 mile in 4.75 seconds.
What is that speed in miles per hour?
(1 hour = 3600 seconds)
757.89 miles per hour
500
Come to the board and draw a position vs time graph for acceleration.
500
A jet fighter begins to land and goes from 1,566 miles per hour down to rest over the course of 2 hours. What was its acceleration?
A=-1566/2=
frac {783 mph}{hour}
500
When an object goes into free fall from 10 miles above earth, will that object continue to accelerate for all 10 miles?
No, it will eventually reach terminal velocity because of air resistance