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robotics final

QuestionAnswer
Which is not a unit of measurement for angular velocity? m/s
The kinetic friction of one object sliding along a surface depends LEAST upon the area of contact
When using gear trains in a robot, trade-offs must be made. If the robot needs to increase torque, there will be a proportional trade-off in what? speed
A motor works because of thousands of wire loops called winding
Friction is a force that always acts opposite to the object's motion
On a gear, the fulcrum is the center of the gear
Why is it more difficult for a robot to start moving than it is to keep moving after it is in motion? The coefficient of static friction is greater than the coefficient of kinetic friction.
Newton's 2nd Law says force equals the product of the mass and acceleration
A force of 25 lbs acting on a 6 in. wrench yields a torque of 12.5 ft lbs
Torque is force times moments arm length
The Basebot is propelled forward when the wheels roll
What amount of force is necessary to move a robot that weighs 4 lbs. at an acceleration of 12 ft/s2? 1.5 lbs
How much does robot weigh if its mass is 0.125 slug? 4 lbs
Which type of gears does the VEX robotics kit contain? spur
The BaseBot starts at rest and accelerates to a speed of 1.6 ft/s in 2.3 seconds. What was the acceleration of the BaseBot? 8.3 in/s
Rubber on floor tile has a coefficient of kinetic friction of 1.0 and a coefficient of static friction of 2.0. How much force would a 3.5 lb. robot need to produce in order to start moving? 7 lbs
The strength of a battery's charge is measured in volts
A robot has wheels with a 3 inch radius spinning at 100 RPM. How fast can it go? 2.6 ft/s
Which of the following is a gear head motor? modified hobby servo
How can you increase the torque supplied by the Vex motors? Change the gear ratio
In order for the Basebot to roll up a 10° slope it must exert a force that is at the very least equal the forces that work against it. If the forces acting downhill total 2.5 lbs, how much power is produced if the robot travels uphill at 1 ft/s? 2.50 lbs ft/s
A torque of 99 ounce·inches acting on a 6 in. wheel produces a force of 2.1 lbs
Acceleration is defined as the change in velocity divided by the time it took
Cars and robots are not limited by the amount of energy they use, but by the rate at which they use the energy. This is an example of limitation by what? Power
A 10-tooth driver gear meshes with a 20-tooth idler gear, which in turn, meshes with a 40-tooth driven gear. What is the gear ratio of the gear train? 1 to 4
A 60 tooth gear is driven by a 12 tooth gear attached to a motor that produces 80 oz·in of torque. How much torque will be provided to the wheels? 400 oz in
An electric motor is useful because it turns electricity into Mechanical energy
Velocity can be defined as displacement traveled divided by the time it took
If the basebot travels 15 ft in 6.7 seconds, what is the average speed? 2.2 ft/s
Find the work done when a block is moved a distance of 3 ft. by a force of 15 lbs. 45 lb-ft
Work is done when an object is moved a certain distance by which of the following? Force
The motors on the robot act with a 5 lb. force to move the robot and friction acts with 1 lb. force. What is the net force acting on the robot? 4 lbs
The part of the motor that turns is typically called the rotor
A robot has wheels with a 2.75 inch radius spinning at 100 RPM. How fast can it go? 14.4 in/s
What is the wheel rollout of a 6 inch wheel in feet? 1.57 ft
Accelerations are produced by forces
A 5 lb force acting on a 5 inch wheel will produce a torque of 200 oz in
Use the velocity-time graph to determine the acceleration of the object. 1.50 ft/s
A 12 tooth gear is driven by a 36 tooth gear attached to a motor that produces 90 oz·in of torque. How much torque will be provided to the wheels? 30 oz in
Which parameter is important when two different diameter gears need to mesh properly? pitch
A 2.0 kg robot will weigh how many pounds? 4.4 lbs
The motors used in the VEX robotics kit are hobby servos
Torque acting on an object produces rotation
Which of the following is not a dry cell battery? lead acid
A 5 inch wheel rolls 5 revolutions on a horizontal surface without slipping. How far did the wheel travel? 78.5 inches
Which of the following is a rechargeable wet cell battery? lead acid
Which of the following formulas will NOT determine the gear ratio of a gear train? the pitch in the driven gear divided by the pitch in the driver gear.
The sleep_for() command will cause your program to Pause for a certain amount of time
Assuming "headcount" is a variable of type unsigned char, and its current value is 175, what is the most you can add to it before it starts to wrap? 80
Assuming that "final" is an int variable, what is the value of "final" after the following code fragment? final = 17; final /= 3; 5
You have a bin full of good tires ("tires"), and you need to know how many will be left over ("leftovers") after you take out all the full sets of 4. The code would look like leftovers = tires % 4
A "char" variable type is 8 bits. This means IT can hold 256 possible values
"CW" is an abbreviation for clockwise
A while() loop is used to Execute a section of code until a condition is met.
The "{" and "}" are in your program to Encapsulate your code between starting and ending points.
An autonomous robot is one that Uses its own intelligence or program to handle different situations.
It is valid to nest a "while()" statement inside a "for()" loop Always
After the following fragment of code, what is the value of "count"? 40
Signed ints versus unsigned ints Wrap at a lower value
The '==' symbol is used to Perform a comparison with no assignment
An if-else statement is used when You need to do one thing or the other, but not both.
The code "if (students == 14) {conditional code};" Will only execute the conditional code if the value of students is 14
A "syntax" error is when A program error prevents compilation
A "signed" variable type is one that Can hold either positive or negative number values.
When your computer compiles your program, it is Converting your 'C++' program to machine language.
Which of the following is not a component of a robotic system? Program
Identify the Vex component shown: Robot battery
Select the answer that best describes "center of gravity": a measure of robot stability.
Which of the following is not a subsystem of the BaseBot? wheel
Which description below best characterizes a bolt? A fastener with external threads specified to match a nut
Moving the right joystick up in the vertical direction while in Arcade control moves both the left and right side of the robot forward
How many joysticks control the robot's drive train in Tank control? two
Why is it important to organize all the inventory of robotic components? To easily locate the robotic components needed for assembly
A Vex motor is A device that converts electrical energy into mechanical energy.
A 1/4-20 x 0.50" screw has how many threads per inch? 20
The following image shows the ________ of the robot brain
How many programs can be stored in the Vex V5 Robot Brain memory? eight
Which of the following is not an engineering notebook requirement? perforated pages for easy removal
Which of the following is not a main attribute of a screw Color
The __________ step of the engineering design cycle allows designers to be creative and think outside of the box. Brainstorming
Which of the ports on the Robot Brain allows you to connect the brain to a computer? b
Identify the Vex component shown robot radio
_________ are used to protect your eyes. safety glasses
Why is it important to sync the Robot Brain and Wireless Controller? To make sure that each robot receives orders only from its controller
If two gears are set up with a center-to-center distance that is too long they will __________. mesh loosely or not mesh at all
The knobby tire is shown at: d
What type of robotic application is shown in the picture? Machine Loading
Select the style of screw shown in the picture flat head
The ____________ signal from the robot brain instructs the robot to do something. output
A _________ is commonly used to reduce the friction of rotating parts in a machine. Bearing
Never wear _______ in the shop area. sandals
The __________ code inside the Vex V5 Robot Brain allows you to configure and operate the Vex robot without having to program the robot. defult
Identify the Vex component shown: Bumper switch
To protect yourself and others from harm in the classroom you should: keep your work area clean and orderly.
If an injury occurs in the classroom, what is the first thing you should do? report it to the teacher
Which of the following is not a step of the engineering design cycle? Iteration
Switching the Robot Brain to Arcade mode is done via... the Robot Brain 'Drive' menu
Identify the Vex component shown: Hex wrench
When multiple robots are operating at the same time you should: always be aware of your surroundings
If you are missing a component from your kit, you should __________. report it to the teacher
Before testing the gear train, motors and wheels of the BaseBot, it is important to ________________. lift the robot so that the drive wheels are off the ground
lift the robot so that the drive wheels are off the ground keps nut
Your robot uses the standard called: bluetooth
What is the length of the screw shown? 1"
Created by: db13
 

 



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