Vocabulary
What does it mean to free fall?
falling with only gravity acting on it
What are the two measurements needed to calculate speed?
distance and time
Acceleration is rate of change of ____.
velocity
What does "g" represent?
Acceleration of gravity = 9.8 or 10 m/s^2
What is an educated guess?
Hypothesis
Contrast speed and velocity.
velocity has direction
What is the velocity of a sprinter running 100 m northeast in 10 s?
10 m/s northeast
What are the three types of acceleration?
Change in speed
Change in direction
Change in speed and direction
You throw a rock up into the air as hard as you can. It starts to fall and hits the ground in 16.0 s. What is the velocity of the rock when it hits the ground?
160 m/s
What is the variable that the scientist chooses to change in the experiment?
Independent Variable
Contrast instantaneous speed and average speed.
instantaneous speed is the speed at a given instant
Which has a greater speed: a heron that flies 600 m in 1 minute or a duck that travels 60 m in 5 seconds?
The duck, at 12 m/s has a greater speed than the heron, which has a speed of 10 m/s.
A car slows down from 50.0 m/s to 20.0 m/s in 6.0 s. What is the acceleration?
a = - 5.0 m/s2
You drop a rock off the top of a 45 m tall building. Assuming there is no air resistance, how long does it take to hit the ground?
3 seconds
What is the scientific method?
A step by step process used to solve a scientific problem
Two objects traveling at the same speed can have different velocities if they ____________
Move in different directions
If the average speed of a car is 45 km/h, how far can it travel in 0.7 hours?
D=SxT
31.5 km
Which is greater, an acceleration from 25 km/h to 30 km/h or one from 96 km/h to 100 km/h if both occur in the same amount of time of two seconds?
25 -> 30
You drop a rock off Bishop Ward's building. It takes 7.0 s to hit the ground. How tall is the building?
245 m
Meters/second
Define Vector and give an example.
Magnitude and direction. Velocity
Sound waves travels at 330.0 m/s. How long does it take for the sound of thunder to travel 1500 m?
T = D / S
4.5 seconds
A rollercoaster starts moving along a straight track at a constant velocity of 5 m/s in 2 seconds. What is the acceleration?
No acceleration.
A physics class drops eggs from the top of the school, and it takes 10 secs to hit the ground.
How tall was the building, and what was the speed of the egg when it hit the ground?
50 meters and 100 m/s
What is Newton's first law of motion?
object at rest or motion will stay at rest or motion until acted on by a net force