Speed
What is the SI unit for Speed?
m/s
Meters per second
Name the main Force that opposes gravity when skydiving
Drag
(or Air Resistance)
What is a vector?
a measure that has both magnitude and direction
What is the gravitational pull on objects, here on earth?
9.81 m/s2
How many millimeters in 1 meter?
1000 mm
What 2 quantities do we need to calculate speed?
distance and time
A Train is traveling at the speed of 10 m/s at the top of a hill. Five seconds later is reaches the bottom of the hill and is moving at 30 m/s. What is the rate of acceleration of The Train?
4 meters per second squared.
On a velocity-time graph, a steeper gradient of the line would mean...
A greater Velocity
(faster)
My direction changes. Did I accelerate?
yes.
A geese flies 2 km/ hr and then speeds up to 3 km/ hr over 30 minutes. What is its acceleration?
3-2/ 0.5 hrs=2 km/ hr 2
How fast our position changes
Remy travels to school from her house in Tugun and back home at the end of the day. What is her displacement?
0 m
What 2 quantities make up velocity? example
size and direction. km/h
What does acceleration measure?
velocity change over time.
A car slows down from 35 miles per hour to a full stop in 55 seconds. Reminder: 55 seconds needs to be converted into hours! What is its deceleration?
0-35/ 0.0153= 2, 287 miles/hr2
Which speed is greater?
60 km/h or 18 m/s
18 m/s
(18 x 3.6 = 64.8 km/h)
Big Mike's truck accelerates from 0 m/s to 70 m/s in 5 seconds. What is the acceleration of Big Mike's truck?
14 m/s/s
What is the change in velocity of an object that travels 4km East, then 3km North?
5km NE
A car starts at rest and accelerates to 8m/s, in 2 seconds. What is it's acceleration?
4 m/s2
A ball is dropped from a hand and travels downward 1 meter to the floor over 2.3 seconds. What is its velocity?
1 m/ 2.3 sec= 0.43m/s downward
If I run 7 laps of a 400m track at an average speed of 6m/s. How long will it take me?
466.6 secs
Pete loves to sled down his favorite hill. If he hits a speed of 50 m/s after 5 seconds, what is his rate of acceleration? Hint: He starts at 0 m/s at the top of the hill.
10 meters per second squared
Bobby drives his car at a speed of 60 miles per hour for 4 hours. How far has he driven?
240 miles.
What is the formula for acceleration?
a = Vf - Vi / t
A bullet goes from rest (velocity=0) to 30 m/sec east in 4 seconds. What is its acceleration in m/s2?
(30- 0)/ 4 seconds= 7.5 m/s2 east