# VEX Robotics - Concepts To Understand

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| By Brianclc123
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Questions: 13 | Attempts: 3,364

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This quiz will test your understanding of important concepts that you need in order to create advanced VEX Robots.  Use the VEX Inventor's Guide to answer the following questions.  Select all correct answers for each question (some have multiple correct answers).

• 1.

### What is "center of gravity"?

• A.

The middle of the robot.

• B.

The average position of the robot's height.

• C.

The average position of the robot's weight.

• D.

The average position of the robot's mass.

C. The average position of the robot's weight.
D. The average position of the robot's mass.
Explanation
The term "center of gravity" refers to the average position of an object's weight or mass. It is the point where the entire weight of the object can be considered to act. In the context of a robot, the center of gravity represents the average position of its weight or mass, indicating the balance point of the robot. This is important for stability and control, as any imbalance in the robot's weight distribution can affect its movement and performance.

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• 2.

### What is the support polygon?

• A.

Triangles are the most supportive polygon.

• B.

The shape created where your robot touches the ground.

• C.

Any polygon that supports your robot.

• D.

The circles of your robot's tires.

B. The shape created where your robot touches the ground.
Explanation
The support polygon refers to the shape that is formed when the robot touches the ground. This shape represents the area of contact between the robot and the surface it is on, which is important for determining stability and balance. Triangles are not specifically mentioned as the most supportive polygon, and the circles of the robot's tires are not necessarily the only parts of the robot that contribute to the support polygon. Therefore, the correct answer is "The shape created where your robot touches the ground."

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• 3.

### In order to have a robot that doesn't fall over, the _____________________ needs to be over the _____________________.

center of gravity support polygon
Explanation
spelling counts & use only spaces between the two phrases

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• 4.

• A.

A

• B.

B

B. B
• 5.

### What is the best way to connect two metal VEX bars?

• A.

One screw on the top.

• B.

One screw on the bottom.

• C.

Two screws. One above the other.

• D.

Two screws. One to the side of the other.

• E.

Two screws. One diagonal to the other.

E. Two screws. One diagonal to the other.
Explanation
The best way to connect two metal VEX bars is by using two screws, with one screw positioned diagonally to the other. This method ensures a secure and stable connection between the bars, preventing any potential loosening or dislodging. By placing the screws diagonally, it creates a stronger bond and distributes the force evenly across the connection, making it less likely to break or come apart under stress.

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• 6.

### What's the difference between a motor and a servomotor?

• A.

A motor only turns counterclockwise.

• B.

A motor only makes a partial rotation.

• C.

A servomotor only makes a partial rotation.

• D.

A servomotor only turns counterclockwise.

C. A servomotor only makes a partial rotation.
Explanation
A servomotor differs from a regular motor because it is designed to only make a partial rotation. Unlike a regular motor, which can rotate continuously, a servomotor is programmed to move to specific positions within its range of motion. This makes servomotors ideal for precise control and positioning applications, such as robotics or automation systems.

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• 7.

### Which gear is connected directly to the motor?

• A.

The driving gear.

• B.

The driven gear.

• C.

The small gear.

• D.

The big gear.

A. The driving gear.
Explanation
The driving gear is connected directly to the motor. In a gear system, the driving gear is the one that receives power from the motor and transfers it to the driven gear. It is usually the gear that is directly attached to the motor shaft. The driven gear, on the other hand, receives the power from the driving gear and transfers it to another component or mechanism. The small gear and the big gear are not necessarily connected directly to the motor, as their size and position may vary depending on the specific gear system.

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• 8.

### Which of the following gear combinations will provide the most torque?A. B. C.

• A.

A

• B.

B

• C.

C

C. C
Explanation
In this question, the gear combination that will provide the most torque is option C. This can be determined by looking at the gear ratios of each combination. The gear ratio is calculated by dividing the number of teeth on the driven gear by the number of teeth on the driving gear. Since option C has the largest number of teeth on the driven gear and the smallest number of teeth on the driving gear, it will have the highest gear ratio and therefore the most torque.

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• 9.

### How do idle gears affect your robot?

• A.

They don't.

• B.

They change the speed of your robot.

• C.

They change the torque of your motor.

• D.

They change the rotation of the gears.

D. They change the rotation of the gears.
Explanation
Idle gears in a robot refer to gears that are not actively engaged with other gears or components. These gears do not directly affect the speed or torque of the robot. However, when the robot is in motion, idle gears can still have an impact by changing the rotation of the gears that are actively engaged. This can affect the overall movement and functionality of the robot.

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• 10.

### How does wheel size affect your robot?

• A.

The bigger your wheels the faster it will go.

• B.

The smaller your wheels the faster it will accelerate.

• C.

The bigger your wheels the slower it will accelerate.

• D.

The smaller your wheels the slower it will go.

A. The bigger your wheels the faster it will go.
B. The smaller your wheels the faster it will accelerate.
C. The bigger your wheels the slower it will accelerate.
D. The smaller your wheels the slower it will go.
• 11.

### Why are clutches important to have on all of your motors?

• A.

They prevent the tires from getting damaged.

• B.

They prevent the motor from getting damaged.

• C.

They provide resistance to the motors.

• D.

They look good.

B. They prevent the motor from getting damaged.
Explanation
Clutches are important to have on all motors because they prevent the motor from getting damaged. A clutch is a mechanical device that allows for the engagement and disengagement of power transmission between the engine and the wheels. It provides a smooth and controlled transfer of power, allowing the motor to start smoothly, change gears, and stop without causing damage. Without a clutch, sudden jerks and shocks could occur, leading to motor damage. Therefore, clutches play a crucial role in protecting the motor and ensuring its longevity.

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• 12.

### Do you need to recharge your batteries every time you use them?

• A.

Absolutely! This will prolong the life of the batteries.

• B.

No way! Constant recharging can damage the batteries permanently.

• C.

Sure. Why not?

• D.

It's better to charge your batteries after they've been used for a long period of time.

D. It's better to charge your batteries after they've been used for a long period of time.
Explanation
Charging batteries after they have been used for a long period of time is a better practice because it allows the batteries to fully discharge before recharging. Fully discharging the batteries helps prevent memory effect, which can reduce the overall capacity of the batteries over time. Constant recharging can actually damage the batteries permanently, so it is not recommended.

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• 13.

### What's the difference between "tank mode" and "arcade mode" on your transmitter?

• A.

• B.

Tank mode uses two joysticks.

• C.

• D.

Tank mode is #12.

A. Arcade mode uses one joystick.
B. Tank mode uses two joysticks.
Explanation
The difference between "tank mode" and "arcade mode" on the transmitter is that arcade mode uses one joystick, while tank mode uses two joysticks.

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 02, 2008
Quiz Created by
Brianclc123

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