Science skills
Reference pts
Speed, veloc, accel
S=D/T
DT Graph
100
How is an observation different than an inference?
Observation is a fact, inference is an opinion or guess.
100
An object is moving if its ________ and/or _______ is changing compared to a reference point.
An object is moving if its distance and/or direction is changing compared to a reference point.
100
What is the difference between speed and velocity?
Velocity is speed plus the direction of travel!
100
You get to science 50 s after math class. If the classrooms are 70 m apart, how fast were you walking?
Speed = Distance / Time
Speed = 70m / 50s
Speed = 1.4 m/s
100
Which runner stopped to rest?
Runner C stopped to rest.
200
What is the independent variable in this experiment:
A student explores how the model of a car affects its rate of acceleration.
Independent variable = model of car
200
Pick a ref. pt. to prove that the people are moving!
Moving compared to seats, compartments, windows…
200
An anchor sinks downward underwater at rate of 5 feet every second.
Description of speed, velocity or acceleration?
Velocity (speed & direction)
200
A car speeds down the freeway at 85 mi/h. In 4.5 hours, how far will the car have travelled?
Distance = Speed x Time
Distance = 85 mi/h x 4.5 h
Distance = 382.5 mi
200
Which object is fastest?
Object B is fastest (steepest)
300
What is the dependent variable in this graph?
Dependent = Velocity
Remember DRY MIX!
300
Pick a ref. pt. to prove that the monkey is still!
Still compared to seats, person, clothing, window…
300
What are the 3 different ways an object could accelerate?
Speeding up, slowing down and changing direction are all ways to accelerate.
300
If there was a 190 mph bullet train connecting LA and Sacramento (384 miles apart), how long would a non-stop trip take? Round to the nearest whole number!
Time = Distance / Speed
Time = 384 mi / 190 mph
Time = 2 hours
300
When is the object moving closer to the reference pt?
Object is moving closer to the ref pt from 5-6s & 10-14s
400
List at least three controls in this experiment:
A researcher explores how the weight of a car affects its speed in a race.
Controls: model of car, driver, weather, road conditions, condition of car…
400
Prove that the dog is still. Explain using evidence!
The dog is still because the distance & direction are not changing between the dog & person, or the dog & surfboard, or the dog & the chair.
400
The Earth orbits the Sun once a year at a constant rate.
Description of speed, velocity or acceleration?
Acceleration (constant speed but changing direction)
400
Hanna’s mom drives north for 2 hours going 70 miles per hour. She then drives west for 3 hours going 50 miles per hour. How many miles total has she driven?
Distance = Speed x Time
D = (70 x 2) + (50 x 3)
D = 140 + 150
D = 290 miles
400
Describe the motion represented by this graph in as much detail as possible
Moving away & speeding up → stationary → moving closer & slowing down
500
What are the sayings we use for each of these to help us remember them?
Independent =
Dependent=
Controls=
Independent = What's Intentionally changed
Dependent= Data that we measure at the end
Controls= Cannot Change
500
Prove that the buildings are moving. Explain using evidence!
The buildings are moving because the distance/direction changes between cars & buildings or people & buildings.
500
List at least five different units used to measure speed aside from mph!
Km/h, m/s, cm/s, ft/s, yd/s, in/min, ft/min, yd/min, mi/s, km/s, cm/h, ft/h, in/yr, cm/yr, mi/min…
500
A plane flies 1150 miles in 2 hours. If it maintains its speed, how long will it take to fly another 805 miles?
S = D / T = 1150 / 2
S = 575 mph
T = D / S = 805 / 575
T = 1.4 hours
500
Make a DT graph using the garage as your ref pt! A person starts walking from a parking garage over to a restaurant. On the way they stop and wait at a crosswalk. They realize their shoe is untied and set their stuff down to fix it. They look up just in time to see they have 8 seconds left to cross. They start jogging across the street, get part-way there and realize they left their stuff behind. They sprint back to their stuff and get stuck waiting to cross again.
