Question 1

All of the following are correct statements about braking EXCEPT ________.

Accepted Answer

Kinetic energy is proportional to the square of the speed, so if the speed doubles, the kinetic energy increases by a factor of four, not two.

Question 2

The brake pedal assembly uses a mechanical lever to ________.

Accepted Answer

The brake pedal assembly uses a mechanical lever to increase the driver's force on the brake pedal applied to the master cylinder, effectively amplifying the force the driver applies to achieve the necessary braking force.

Question 3

Technician A says that work is being performed if a force is being applied, yet the object does not move.Technician B says that torque is a twisting force that may or may not result in motion. Which technician is correct?

Accepted Answer

Technician B is correct because torque indeed refers to a twisting force that can result in motion but doesn't necessarily have to for the force to be considered torque. Technician A is incorrect because work, in a physical sense, requires both force and movement in the direction of the force; if the object does not move, no work is being performed.

Question 4

Two technicians are discussing engine horsepower and torque figures. Technician A says that torque is measured on a dynamometer. Technician B says that horsepower is measured on a dynamometer. Which technician is correct?

Accepted Answer

The answer of Two technicians are discussing engine horsepower and...

Question 5

An example of a lever and mechanical advantage used on a vehicle is the ________.

Accepted Answer

The brake pedal in a vehicle is an example of a lever that provides mechanical advantage, allowing the driver to apply a large force to the brakes with a relatively small force applied to the pedal.

Question 6

Two technicians are discussing temperature and heat. Technician A says that temperature is the intensity of the heat source. Technician B says that heat is the amount of heat. Which technician is correct?

Accepted Answer

Both statements are correct. Temperature measures the intensity or degree of heat present, often perceived as how "hot" or "cold" something is, while heat refers to the total amount of thermal energy transferred from one body to another.

Question 7

Heat can move or travel by ________.

Accepted Answer

Heat can move or travel by convection (movement of heat through fluids), radiation (transfer of heat through electromagnetic waves), and conduction (transfer of heat through direct contact).

Question 8

Technician A says that zero degrees Celsius is the freezing temperature of water. Technician B says that 100 degrees Celsius is the boiling temperature of water. Which technician is correct?

Accepted Answer

Both statements are correct. Zero degrees Celsius is indeed the freezing point of water, and 100 degrees Celsius is the boiling point of water at standard atmospheric pressure.

Question 9

Technician A says that pure (distilled) water has a pH of 7. Technician B says that the pH of an acids is less than 7. Which technician is correct?

Accepted Answer

Both statements are correct. Pure water has a neutral pH of 7, and acids have a pH less than 7.

Question 10

Technician A says that the kinetic energy of a vehicle is proportional to its weight. Technician B says that the kinetic energy of a moving vehicle is directly proportional to its speed. Which technician is correct?

Accepted Answer

The answer of Technician A says that the kinetic energy...

Question 11

What term describes the ability to do work?

Accepted Answer

Energy is defined as the ability to do work, which can be transferred between objects and converted in form, but not created or destroyed (conservation of energy).

Question 12

Which type energy is contained by a fully charged battery that is NOT connected to anything?

Accepted Answer

A fully charged battery that is not connected to anything contains potential energy. This is because the chemical energy stored within the battery has the potential to do work (such as powering a device) when the battery is connected to a circuit.

Question 13

Technician A says that torque always involves movement. Technician B says that torque may be multiplied by leverage. Which technician is correct?

Accepted Answer

Technician B is correct because torque can indeed be multiplied by using leverage, which is a fundamental principle in mechanics. Technician A is incorrect because torque does not always involve movement; it is a measure of the force that can cause an object to rotate about an axis, and it can exist even if there is no actual rotation happening.

Question 14

What term describes the result when force is used to move an object?

Accepted Answer

Work is the term used to describe the result when force is applied to move an object over a distance.

Question 15

Work describes the movement of an object when force is applied?

Accepted Answer

Work is defined as the process of moving an object by applying force over a distance.

Question 16

One horsepower is the power required to move ________ pounds a distance of one foot in one second.

Accepted Answer

One horsepower is defined as the power required to move 550 pounds a distance of one foot in one second.

Question 17

A dynamometer actually measures ________ output of an engine.

Accepted Answer

A dynamometer measures the torque output of an engine, which can then be used to calculate power.

Question 18

Horsepower is torque times RPM divided by ________.

Accepted Answer

Horsepower is calculated by multiplying torque (in pound-feet) by RPM (revolutions per minute) and then dividing the product by 5252.

Question 19

The energy of mass in motion is called ________.

Accepted Answer

Kinetic energy is the energy that an object possesses due to its motion.

Question 20

The greater an object's mass at a given speed, the ________ kinetic energy it possesses.

Accepted Answer

The kinetic energy of an object increases with its mass, given that the speed remains constant. The formula for kinetic energy is $KE = \frac{1}{2}mv^2$, where $m$ is mass and $v$ is velocity, indicating that kinetic energy is directly proportional to mass.

Quiz 13: Scientific Principles and Materials