Identify the Givens
Choose the Equation
Algebra Steps
Know your Units
Vocabulary
Falling Objects
100
Identify what information is given by the following.
A car accelerates from 5 m/s.
v0 = 5 m/s
100
Which equation would you use? The question mark indicates the variable that we want to solve for.
vf = 21 m/s v0 = 0 m/s a = 1.24 m/s2
t = d = ?
vf2 = v02 + 2ad
100
What is the next step in solving this problem?
144 = 100 + 5t2
subtract 100 from both sides
100
Unit for initial velocity
m/s
100
The constant speed that a falling object eventually reaches due to the effect of air resistance.
(free fall, acceleration, velocity, terminal velocity)
Terminal Velocity
100
What happens to the velocity of an object as it falls?
(increases, decreases, stays the same)
increases
200
Identitfy what information is given by the following.
A car comes to a stop.
vf = 0 m/s
200
A truck travels 60 km/h for 0.5 h. How far did the truck travel during this time?
Which equation should be used to solve this problem?
d = vt
It is a velocity problem
200
What is the final step in solving this problem?
vf2=144
Take the square root of vf2 and 144
200
15 meters is _______________
(distance, velocity or acceleration)
distance
200
The rate of change of position.
(free fall, acceleration, velocity, terminal velocity)
Velocity
200
A a rock is dropped off a cliff. As it falls, its acceleration (increases, decreases, stays the same)
stays the same
300
Identify what information is given by the following,
Starting from rest, a car...
v0 = 0 m/s
300
Choose the equation you would use to solve the following problem.
A ball is dropped from the top of a 200 m tall building. How fast is it going just before it hits the ground?
vf2 = v02 + 2ad
300
Simplify this equation
100 = 2(a)25
100 = 50a
300
An object in free fall falls at a constant rate of -10 _____.
m/s2
300
The rate of change in velocity. This occurs when something speeds up, slows down, or changes direction.
(free fall, acceleration, velocity, terminal velocity)
acceleration
300
A bowling ball and a feather are dropped from the same height and at the same time. Without air, what will happen?
Both will hit the ground at the same time
400
Identify what information is given by the following.
Speeds up at a constant rate of 3 m/s2
a = 3 m/s2
400
Choose the equation that you would use to solve the following problem.
A particle has an initial velocity of 2 m/s and an acceleration of 4 m/s2. Find how far it traveled after 10 seconds have passed.
d = v0t + ½ a t2
400
What two steps would you take to solve this equation for t?
7 = 2 + (-9.8)t
subtract 2 from both sides
divide both sides by -9.8
400
24 km/hr represents what kind of value?
(distance, velocity or acceleration)
velocity
400
The state of an object that is being influenced by the downward force of gravity.
(free fall, acceleration, velocity, terminal velocity)
Free Fall
400
You read a problem about an object that is dropped. What two pieces of information do you know about this object? Consider the following.
Vf = Vo = a = t = d =
Vo = 0 m/s
a = -10m/s2
500
Identify what TWO pieces of information is given by the following.
A rock is dropped from a bridge.
v0 = 0 m/s and a = -10 m/s2
500
Choose the equation that you would use to solve the following problem.
How much time is required for a car to travel a distance of 500 m with an average velocity of 20 m/s?
d = vt
500
vf2 = 02 + 2(1)(8)
Solve for vf
vf = 4 m/s
500
An object dropped from rest starts off traveling at 0 _____.
m/s
500
Velocity at a specific moment in time
(free fall, acceleration, terminal velocity, initial velocity, instantaneous velocity)
Instantaneous Velocity
500
How does the speed of the car at photogate B compare to the speed at photogate A?
It is greater (accelerating down the ramp)