Physics
The unit for acceleration
m/s2
The unit for velocity
m/s
Candela
What is the acceleration formula?
a=(V-U)/t
the acceleration due to gravity
9.8 m/s2
If an object is at rest, what is its velocity?
0 m/s
A hammer and a feather are dropped at the same time on the moon. They both reach the ground at the same time. Why?
There is no air, so all objects will fall at the same rate
Unit for velocity
m/s
This is the formula to calculate Speed
distance over time
An object slowing down has what acceleration?
negative acceleration
What is "g"?
Acceleration due to gravity in formulas
Give the formula for total distance
dt = d1 + d2 + d3...
The difference between speed and velocity
speed tells you how fast an object moves, while velocity tells you how fast it moves and in what direction
The difference between Scalar and vector.
Scalar only indicates magnitude while vector indicates magnitude and direction.
In acceleration formula, what does V stand for?
Final Velocity
A gun is fired directly into the sky, what would the velocity of the bullet be when it reaches it's maximum height?
0 m/s
What is the sign for directions west and south in displacement?
negative
He travels 300 m east and 20 m west. What is his displacement?
280 m west
What does the first law of newton indicate?
An object in motion stays in motion"
What is the formula for velocity?
displacement over time
The distance a car travelled if it drove at 40 m/s for 30 minutes (Convert to km)
72 km?
D = v*t = 40 m/s * 1800 s
D= 72,000 m = 72 km
John travels 250 km to North but then back-tracks to South for 105 km to pick up a friend. What is John's total displacement?
D = ΔX = (Xf – Xi)
D = (250 km N – 105 km S) – 0
D = 145 km N
What is the acceleration of an object that changes its speed of 45m/s to 75m/s in 5 seconds?
6 m/s^2
Tyler runs the basketball court 5 times (from one side back to the other 5 times). Ending in his original starting place. What is Tyler's displacement at the end of his run?
0 meters. He ended where he started
Find the average velocity when the changes in displacement in three consecutive instances are 8 m, 10 m, 12 m, and the total time taken is 6 s.
Average velocity = total change in displacement/total time taken = 30/6 = 5 m/s.