1.
What is the purpose of using ball bearings in a mechanical system?
To increase friction
To reduce friction
To increase weight
To generate electricity
2.
Two gears are meshed together. The larger gear has 40 teeth, and the smaller gear has 20 teeth. If the larger gear rotates at 60 revolutions per minute (RPM), what is the rotational speed of the smaller gear?
30 RPM
60 RPM
120 RPM
240 RPM
3.
A block is sliding down a frictionless incline. What type of energy is primarily being converted as it moves?
Kinetic energy to thermal energy
Potential energy to kinetic energy
Kinetic energy to potential energy
Thermal energy to potential energy
4.
Which of the following materials is the LEAST conductive of heat?
Copper
Aluminum
Steel
Wood
5.
Which type of energy is primarily converted to mechanical energy in an internal combustion engine?
Thermal energy
Electrical energy
Kinetic energy
Potential energy
6.
A lever is used to lift a heavy object. If the distance from the fulcrum to the point where the force is applied is doubled, what happens to the amount of force needed to lift the object?
It is halved.
It remains the same.
It is doubled.
It is quadrupled.
7.
Which of the following is an example of a first-class lever?
Wheelbarrow
Nutcracker
Crowbar
Tweezers
8.
What is the primary purpose of a flywheel in a mechanical system?
To increase speed
To store energy
To decrease weight
To change direction
9.
Which of the following is an example of potential energy?
A moving car
A spinning top
A stretched rubber band
A flowing river
10.
A gear system consists of a small gear with 10 teeth and a larger gear with 40 teeth. If the small gear turns once, how many times does the larger gear turn?
1/4
1/2
1
4
Questions Answered: 0/10