Speed, Distance & Time
What is the symbol for distance?
d
What is the symbol for velocity?
v
TRUE or FALSE: Displacement requires a direction.
TRUE
Write the units for acceleration.
m/s2
What is the name of our solar system?
The Milky Way
Draw the speed, distance and time triangle.
Speed = distance / time
1) Speed
2) Direction
Explain how displacement is different to distance.
Distance is the total length of the path traveled by an object, regardless of direction.
Displacement is the straight-line change in an object's position from its starting point to its ending point, including direction.
Write the formula for acceleration
acceleration = final velocity - initial velocity / time
How many planets are in our solar system?
8
A car travels 1500 m in 60 s. What is its average speed?
25 m/s
Write the formula for velocity.
Rearrange the velocity to formula to find the displacement.
Displacement = velocity x time
What is the difference between initial and final velocity?
Initial velocity is the starting speed and direction of an object at the beginning of a defined time interval, while final velocity is the object's speed and direction at the end of that same time interval.
How many bones are there in the human body?
206
A cyclist is moving at a constant speed of 8 m/s. How long will it take them to travel 2000 m?
250 seconds
A runner covers 1500 m east in 300 s. What is their average velocity?
velocity = d /t = 1500 / 300 = 5 m/s east
A runner moves with a constant velocity of 6 m/s for 50 s. Calculate their displacement.
d = vt
= 6 * 50 = 300m
A car speeds up from 0 m/s to 15 m/s in 5 s.
a = 15/3 = 3m/s/s
What is the atomic number of Carbon?
6
A train travels 6000 m at 20 m/s, then 9000 m at 30 m/s. Find the average speed for the whole journey.
T1 = 6000/20 = 300s
T2 = 9000/30 = 300s
300 +300 = 600s
Average speed = total distance / total time = 15000 / 600 = 25 m/s
A student walks 60 m north in 30 s and then 40 m south in 20 s.
Calculate the student’s average velocity.
d = 60 m north - 40 m north = 20 m north
Time = 30 + 20 = 50s
Velocity = D/t = 20/50 = 0.4 m/s north
A cyclist travels east with a velocity of 10 m/s for 120 s, then immediately west at 8 m/s for 150 s.
Find the total displacement from the starting point.
D1 = 10 x 120 = 1200m east
D2 = 8 x 150 = 1200m west
1200 east - 1200 west = 0m
A bike slows down from 12 m/s to 0 m/s in 4 s.
a = -12/4 = -3 m/s/s
How many bones are there in the human body?
206