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Identifying Variables
Conversions
Newton's Laws of Motion
Speed & Acceleration
Work & Momentum
100
What is a constant in an experiment?
The variable(s) that stay the same in an experiment.
100
How many minutes are in 3 days.
4,320 mins in 3 days (60mins) * 24 hours [1 day] = 1440 mins in one day 1440 mins * 3days = 4320 mins in 3 days
100
Newton's first law of motion is also called the law of _________.
Inertia
100
Motion is change in
Position
100
Calculate the work needed to lift a block weighing 10 newtons and distance of 5 meters.
WORK = 50 JOULES
200
What term is used to describe the variable that scientist can change in an experiment?
Independent Variable
200
How many seconds in 1 day?
8,4600 sec in 1 day 60 sec * 60 min = 3600 sec in 1 hour 3600sec * 24 hr = 8,640 sec in 1 day
200
Describe all 3 of Newton's Laws
1st- object at rest will remain at rest or an object in motion will remain in motion unless acted on by a force. 2nd- Force = Mass * acceleration 3rd- Every action has an opposite & equal reaction.
200
Acceleration is rate of change of __________.
velocity
200
A boy lifts a 5kg box 4 meters off of the floor and carries it 20 meters where he places it on a truck. Calculate the amount of work the boy performed.
Work = 100 Joules
300
What term is used to describe the variable that depends on another variable to change?
Dependent Variable
300
How many seconds are there in 3 days?
259,200secind in 3 days 60sec * 60mins= 3600 sec in 1 hour 3600sec * 24hr= 8640 sec in 1 day 86400* 3days = 259,200 sec in 3 days
300
According to Newton's 3rd law, if a box is pulled up with 290 N force, what is the reaction force?
290 N force pushing on Bryan's hands by the box.
300
What type of acceleration does a horizontal line on a velocity/time graph show?
Zero acceleration
300
A bus is traveling down a straight stretch of highway at 75 miles per hour. The driver suddenly slams on the brakes and brings the car to a quick stop. What happens as a result to the unbelted passengers?
THEY WILL CONTINUE TO MOVE FORWARD IN A STRAIGHT LINE.
400
What term is used to describe a group or variable that does not receive anything special in an experiment. The scientist just uses it to compare the changes of other variable to.
Control Group
400
According to the question below, what are you solving for? what must you convert before you solve? How do you convert that? solve the problem An automobile travels 50m/sec for 2 minutes. The car has traveled ________?
distance, Minutes to seconds Multiply 60 sec by 2 mins (120 sec in 2 min) D= S*T; D= 50*120; D=6,000meters
400
A 300-N force acts on a 25-kg object. The acceleration of the object is?
12 m/s2 300N/ 25kg = 12m/s2
400
After traveling a distance of 30m in 8s at a constant speed, Michael sees a truck starting to cross in front of him,. He accelerates to a stop at a rate of -1.88m/s2. How much time does it take Michael to stop? Round to the nearest whole number.
2seconds S=d/t ; S= 30m/8s; S= 3.75m/s A=V2-V1/T ; A= -1.88m/s2 ; V1 = -3.75; V2=0; T=Unknown -.188m/s2=(0-3.75)/X X=(-3.75/-1.88)= 1.99~2sec
400
Daniel is testing the acceleration performance of his remote controlled helicopter. Starting from rest he accelerates his helicopter to a maximum speed of 3.1 meters per second in 3.5 seconds. Calculate the average acceleration of Daniel’s helicopter.
0.89 M/SEC2
500
Identify the control group, constant, independent variable, and dependent variable in the following experiment. Mr. Krabbs wants to make Bikini Bottom a nicer place to live. He has created a new sauce that he thinks will reduce the production of body gas associated with eating crabby patties from the Krusty Krab. He recruits 100 customers with a history of gas problems. He has 50 of them (Group A) eat crabby patties with the new sauce. The other 50 (Group B) eat crabby patties with sauce that looks just like new sauce but is really just mixture of mayonnaise and food coloring. Both groups were told that they were getting the sauce that would reduce gas production. Two hours after eating the crabby patties, 30 customers in group A reported having fewer gas problems and 8 customers in group B reported having fewer gas problems.
control- Group B (no special sauce) constant- History of gas problems, Independent Variable- Special Sauce Dependent Variable - Production of body gas
500
Explain, how you would calculate how many seconds are in 2 years.
Determine how many second are in 1 hour. Multiply that number by how 24 hours to find how many seconds are in a day. Multiply that number by 365 to determine how many seconds are in a year. Multiply that number by 2 to determine how many seconds are in 2 years.
500
A Book is resting on a table. The force of gravity pulls down on the book with a force of 20 Newtons. What prevents the book from accelerating downward at 9.8m/s2?
The table presses back on the book with an equal & opposite force of 20 N
500
Alyna is riding her bicycle on a road at a constant speed. She travels a distance of 22 meters in 31 seconds. When she sees a car backing out it takes her 2 seconds to slow to a complete stop. What is her average acceleration AFTER seeing the car backing out? Round to the nearest hundredth.
-0.35 m/s2 A= V2-V1/T V1= 0.7 V2=0 T=2
500
Describe why a rocket can fly into space.
ROCKET PUSHES EXHAUST GASES BACKWARD, THEN THERE IS AN EQUAL AND OPPOSITE REACTION PUSHING THE ROCKET FORWARD