Speed
What is the formula to calculate speed? what are the common units for speed?
Units: m/s
What is included in a velocity calculation that is not included in a speed calculation?
direction!
What are the units for momentum?
kg x m/s
When an object’s acceleration is negative, what is happening to its motion?
its slowing down
Who is the all time highest scorer in the NBA?
LeBron James
A student runs 150 m in 30 seconds. What is their average speed?
5 m/s
A car drives 60 km west in 1.5 hours. What is its velocity?
40 km/hr West
A 1.5 kg ball rolls at 4.0 m/s. What is its momentum?
6 kg x m/s
A bus increases its velocity from 5.0 m/s to 25 m/s in 10 seconds. What is its acceleration?
2 m/s2
What is the largest desert in the world?
Antartica
A boat sails at 12 km/h for 2.5 hours. How far did it travel?
30 km
List two ways a driver can change their velocity while driving in a straight line.
1. speed up (inc. speed)
2.slow down (dec. speed)
A van with a mass of 1,500 kg moves at 15 m/s. What is its momentum?
22,500 kg x m/s
A car slows from 22 m/s to 10 m/s in 6 seconds. What is its acceleration?
-2 m/s2
How many card are in a standard deck?
52
A cyclist travels 3,600 meters in 6 minutes. What is their average speed?
600 m/min
A car travels around a circular track at 25 m/s. Is the velocity changing? why?
Yes! b/c the car is changing direction!
A soccer player kicks a 0.45 kg ball giving it a momentum of 3.6 kg·m/s. What is the ball’s velocity?
8 m/s
A rocket speeds up from 0 to 100 m/s in 20 seconds. What is its acceleration?
5 m/s2
What freezes faster hot or cold water?
hot water
A runner covers the first 50 m of a race in 6 s and the next 50 m in 4 s. What is their average speed for the full 100 m?
Average speed = total distance/ total time
10 m/s
A deer covers a distance of 30 m in 4 seconds, while a zebra covers a distance of 50 meters in 6 seconds. What is the velocity of the deer and zebra and which animal is faster?
Deer: 7.5 m/s
Zebra: 8.3 m/s
Zebra is faster
Compare the momentum of a basketball (0.60 kg moving at 12 m/s) and a football (0.40 kg moving at 20 m/s). Which has greater momentum?
Basketball = 7.2 kg x m/s
Football = 8 kg x m/s
football has greater momentum
A sprinter slows from 12 m/s to 4 m/s in 2 seconds. What is their acceleration?
-4 m/s2
What is the human bodies largest organ?
The skin