Definitions
a. Define scalar quantity.
b. Define vector quantity.
a. Scalar: number
b. Vector: number and direction
Is volume scalar or vector?
Scalar
Calculate velocity:
A puppy runs 20 meters east in 60 seconds.
0.33 m/s east
What is acceleration?
Change in velocity over time. (speeding up or slowing down)
What is the difference between distance and displacement?
a. Distance: total length traveled
b. Displacement: length between initial and final positions
Distance is ________.
Displacement is __________.
Distance is SCALAR.
Displacement is VECTOR.
Calculate velocity:
A car is driven 7 m backwards in 35 seconds.
- 0.2 m/s
Calculate acceleration:
V1: 3 m/s
V2: 17 m/s
t: 25 sec
0.56 m/s/s
What are the four types of motion?
1. stopped
2. constant
3. speeding up (acceleration)
4. slowing down (deceleration)
Speed is a SCALAR quantity and velocity is a VECTOR quantity.
Speed is a number and velocity is a number with direction.
Calculate distance:
A person runs 10 mi/hr for 1.5 hours.
15 miles
A velocity vs. time graph has the following coordinates: (0 s, 85 m/s) and (70 s, 10 m/s)
Calculate acceleration.
-1.07 m/s
What is an example unit for...
a. distance
b. time
c. velocity
d. acceleration
a. meters, cm, feet, miles, km
b. sec, min, hr, days, weeks, months, years
c. m/s, mi/hr, km/min
d. m/s/s, m/hr/s, mi/min/s
Write 2 examples of scalar quantities and 2 examples of vector quantities.
Scalar: volume, mass, distance, weight, area, length, speed
Vector: displacement, force, velocity, acceleration
A position vs. time graph has the following coordinates: (0 min, 0 km) and (20 min, 550 km).
Calculate velocity.
27.5 km/min
Calculate the change in velocity.
a= -2.5 cm/sec
t= 30 sec
- 75 cm/sec
a. What did we measure in the car lab?
b. What did we discover from the graph?
a. position change over time
b. slope = velocity of the car
Acceleration is ________ because _________.
Acceleration is VECTOR because it is change in velocity over time, and velocity is a VECTOR quantity.
Calculate time:
A marble rolls 95 cm at 12 cm/sec.
7.92 seconds
Calculate final velocity.
a = 3 miles/min^2
V0 = 2 miles/min
t = 10 min
Vf = 32 miles/min