Physics and Mechanical Systems: Gears, Levers, Pulley, and Electrical Principles

What is the mechanical advantage of a ramp?

The mechanical advantage of a ramp is the ratio of the length of the ramp to the height it raises the object.

What is the formula to find current?

The formula to find current (I) is I = V / R, where V is voltage and R is resistance.

How do you find resistance using current and voltage?

Resistance (R) can be found using the formula R = V / I, where V is voltage and I is current.

How do you find voltage using current and resistance?

Voltage (V) can be calculated using the formula V = I * R, where I is current and R is resistance.

What is the imaginary circle around which the teeth on a gear are uniformly spaced called?

It is called the pitch circle.

What type of lever is a seesaw?

A seesaw is an example of a first class lever.

What is a doorknob an example of?

A doorknob is an example of a wheel and axle.

What is the linear distance that a screw travels in one revolution known as?

It is known as the lead of the screw.

What is the ratio between a machine's actual and ideal mechanical advantage called?

It is called the efficiency of the machine.

What happens to torque along a gear train as rotational speed decreases?

The torque along a gear train will increase as the rotational speed decreases.

What type of gear is used in a car's steering wheel?

A car's steering wheel uses a type of gear called a rack and pinion.

What can a gear train change between the input and output shafts?

A gear train can change the rotational speed and torque.

What is a spur gear that interfaces with a flat bar called?

It is called a rack.

What is the mathematical curve that defines gear teeth called?

It is called an involute.

What is the gear ratio if the input gear has 15 teeth and the output gear has 60 teeth?

The gear ratio is 1:4.

What happens to the output gear if the driver gear turns clockwise?

The output gear will turn counterclockwise.

What is the purpose of the center gear in a gear train?

The purpose of the center gear is to change the direction of rotation.

What happens to the output gear if the input gear rotates 10 times in a gear train with a 40-tooth input and a 30-tooth output gear?

The output gear will rotate 13.33 times.

What is the relationship between the diameters of driver and driven pulleys in a pulley system?

The ratio of the diameters of the driver and driven pulleys determines the speed ratio.

What is the efficiency of a winch system lifting a 3 N load 6 meters in 60 seconds at 9 volts and 500 mA?

The efficiency can be calculated using the formula: Efficiency = (Output Work / Input Work) * 100%.

What is the current running through a light bulb with 15 ohms of resistance hooked to a 1.5 volt battery?

The current will be 0.1 A (100 mA).

What happens to the circuit when another lamp is added in parallel?

The total current in the circuit increases, but the voltage remains the same.

What does Ohm's law explain?

Ohm's law explains the relationship between voltage, current, and resistance in a circuit.

What is a material that allows electrons to flow through it easily called?

It is called a conductor.

What limits the flow of electrical current?

Resistors limit the flow of electrical current.

What is the center of an atom called?

The center of an atom is called the nucleus.

What is the relationship between a joule and a watt?

A watt is equal to one joule per second.

How powerful is a weightlifter lifting 2000 Newtons to a height of 2 meters in 4 seconds?

Power is calculated as work done over time; it is 1000 watts.

In a second class lever, the distance from the effort to the fulcrum is ____________ the distance from the load/resistance to the fulcrum.

In a second class lever, the distance from the effort to the fulcrum is less than the distance from the load/resistance to the fulcrum.

In a third class lever, the distance from the effort to the fulcrum is ____________ the distance from the load/resistance to the fulcrum.

In a third class lever, the distance from the effort to the fulcrum is less than the distance from the load/resistance to the fulcrum.

Given a second class lever with a distance of 5 feet from the fulcrum to the effort and a distance of 33 inches from the resistance to the fulcrum, what is the maximum amount of weight that can be lifted with 25 lbs of effort?

To find the maximum weight lifted, use the formula: Load = (Effort × Distance from Effort) / Distance from Load. Convert 33 inches to feet (2.75 feet). Load = (25 lbs × 5 ft) / 2.75 ft = 45.45 lbs.

What is the weight (resistance) you could lift using a first-class lever if you apply 20 lbs of effort? The effort arm is 10 feet and the resistance arm is 5 feet.

Using the formula: Load = (Effort × Distance from Effort) / Distance from Load, Load = (20 lbs × 10 ft) / 5 ft = 40 lbs.

A lever turns on a fixed point. This fixed point is called a ______.

This fixed point is called a fulcrum.

An example of a lever is a ________.

An example of a lever is a seesaw.

What type of lever does the pictured object (levers 3.png) use?

The type of lever used in levers 3.png is a second-class lever.

What type of lever does the pictured object (levers 1.png) use?

The type of lever used in levers 1.png is a first-class lever.

What type of lever does the pictured object (levers 5.png) use?

The type of lever used in levers 5.png is a third-class lever.

Which of the levers pictured is a first class lever?

The lever that is positioned with the fulcrum between the effort and the load is the first-class lever.

When used to pry open a can of paint, a screwdriver functions as a ______.

When used to pry open a can of paint, a screwdriver functions as a lever.

When opening a paint can you put an opener along the rim of the can. What acts as the fulcrum?

The rim of the can acts as the fulcrum.

The ideal mechanical advantage of a pulley system is dependent upon the number of _______.

The ideal mechanical advantage of a pulley system is dependent upon the number of supporting strands.

A pulley with 3 supporting strands would require 30 lbs to lift how much weight in pounds?

A pulley with 3 supporting strands would lift 90 lbs (30 lbs effort × 3 strands).

A fixed pulley is used to change the ______.

A fixed pulley is used to change the direction of force.

Which simple machine can NOT be used to increase force?

An inclined plane can NOT be used to increase force; it only changes the direction of force.

What is the difference between the support cable and the effort cable in a fixed pulley system?

The support cable holds the load, while the effort cable is pulled to lift the load.

What is the mechanical advantage of a pulley system?

The mechanical advantage of a pulley system is the ratio of the load force to the effort force.

The linear distance that a screw travels in one revolution is known as its _______.

The linear distance that a screw travels in one revolution is known as its pitch.

What does 3/8 - 16 mean?

3/8 - 16 indicates a screw with a diameter of 3/8 inches and 16 threads per inch.

What is the mechanical advantage of a 3/8" diameter screw with 20 threads per inch if a 1.5" diameter screwdriver is used to install the screw?

The mechanical advantage can be calculated using the formula: MA = (Diameter of screwdriver) / (Pitch of screw). MA = 1.5 inches / (1/20) = 30.

An Archimedes screw is used to ________.

An Archimedes screw is used to lift water or other fluids.

Changing rotary motion to linear (straight line) motion is a function of the __________.

Changing rotary motion to linear motion is a function of the screw.

The distance between two adjacent threads on a screw is called the __________ of the screw.

The distance between two adjacent threads on a screw is called the pitch.

What is the formula for calculating the pitch of a screw when the number of threads per inch are known?

The formula for calculating pitch is: Pitch = 1 / (Number of threads per inch).

A screw with 14 threads per inch is turned by a screwdriver having a handle diameter of 1". What is the ideal mechanical advantage of the screw?

The ideal mechanical advantage is calculated as: MA = (Diameter of screwdriver) / (Pitch of screw). MA = 1 inch / (1/14) = 14.