Vector vs. Scalar
Define vector:
A quantity that has both magnitude and direction.
During a race on level ground, Andra runs with an average velocity of 6.02m/s to the east. What is Andra's displacement after 137s?
825m to the east.
An automobile with an initial speed of 4.30 m/s accelerated uniformly at the rate of 3.00m/s2. Find the final speed after 5.00s.
19.3m/s
Suppose a treadmill has an average acceleration of 4.7x10-3m/s2. How much does its speed change after 5.0min?
1.4m/s
v0 is positive and the object is speeding up, so acceleration must be:
positive, negative, or zero
positive
Distance is a ______ quantity.
Scalar
Heather and Matthew walk with an average velocity of 0.98m/s eastward. If it takes them 34min to walk to the store, what is their displacement?
1999.2m
A car starts from rest and travels for 5.0s with a constant acceleration of -1.5m/s2. What is the final velocity of the car?
-7.5m/s
A car traveling at 7.0m/s accelerates uniformly at 2.5m/s2 to reach a speed of 12.0m/s. How long does it take for this acceleration to occur?
2.0s
If v0 is positive and acceleration is negative, the object is:
Slowing down
Define Scalar:
A quantity that has magnitude ONLY.
It takes you 9.5 min to walk with an average velocity of 1.2m/s to the north from the bus stop to the museum entrance. What is your displacement?
680m to the north
A car with an initial speed of 6.5m/s accelerates at a uniform rate of 0.92 m/s2 for 3.6s. Find the final speed of the car during this time.
9.8m/s
When Maggie applies the brakes of her car, the car slows uniformly from 15.0m/s to 0.0m/s in 2.50s. How many meters before a stop sign must she apply her brakes in order to stop at the sign?
18.8m
Remains at rest
Displacement is a __________ quantity.
Vector
Simpson drives his car with an average velocity of 48.0 km/h to the east. How long will it take him to drive 144km on a straight highway?
3.00h OR 10,800s
A bus travels 280km south along a straight path with an average velocity of 88km/h to the south. The bus stops for 24min. Then, it travels 210km south with an average velocity of 75km/h to the south. What is the average velocity for the total trip?
77km/h to the south
A car enters the freeway with a speed of 6.4m/s and accelerates uniformly for 3.2km in 3.5min. How fast (in m/s) is the car moving after this time?
24 m/s
v0 is negative and the object is slowing down, so acceleration must be:
positive, negative, or zero.
positive
Acceleration is a _________ quantity.
Vector
A bus travels 280km south along a straight path with an average velocity of 88km/h to the south. The bus stops for 24min. Then, it travels 210km south with an average velocity of 75km/h to the south. How long does the total trip last?
6.4h OR 23,040s
A coin is tossed straight up. What happens to its velocity while it is in the air?
It is slowing down until it reaches the top of its path (briefly at a velocity of zero) before it starts to move back down where it begins to speed up again.
A coin is tossed vertically upward. Describe its acceleration.
Constant acceleration.
If initial velocity is zero and the car is speeding, the acceleration is:
positive OR negative