GCSE DT 1.5 mechanics

What is the order for the effort load and fulcrum in a class 1 lever

Effort and Load are on opposite sides with fulcrum in the middle (See-saw)

What is the order for the effort load and fulcrum in a class 2 lever

Effort and Load are on the same side with the load closest to the fulcrum (Wheelbarrow).

What is the order for the effort load and fulcrum in a class 3 lever

Effort and load are on the same sides but the effort is closer to the fulcrum (Tweezers)

What is the equation for finding out the Mechanical advantage of a lever

Mechanical advantage = Load / Effort

If the load is 25kg and the effort is 5kg what is the mechanical advantage

Mechanical advantage = 25kg / 5kg = 5

If the Mecahnical advantage is 2kg and the load is 5kg what is the effort

Effort = Load / Mechanical advantage = 5kg / 2 = 2.5kg.

What is the Vellocity Ratio of a Lever

Velocity Ratio = Distance of Effort / Distance of Load

If the Effort moved 15m and the Load moved 3m what is the Velocity ratio

Velocity Ratio = 15m / 3m = 5.

If the Velocity ratio is 5 and the distace moved by the load is 25m what is the distance moved by the effort

Distance moved by Effort = Velocity Ratio x Distance moved by Load = 5 x 25m = 125m.

What is the equation for the effeciency of a Lever

Efficiency = (Work done by load / Work done by effort) x 100%

If the load has 30J of work done on it and the effort has 6J of work done on it what is the effeciency

Efficiency = (30J / 6J) x 100% = 500%.

If the effeciency of a lever is 20% and the effort has 30J of work done on it what is the work done on the load

Work done on Load = (Efficiency / 100%) x Work done by Effort = (20 / 100) x 30J = 6J.

What is a reverse motion linkage

A reverse motion linkage is a mechanical system that converts rotary motion into linear motion in the opposite direction.

How do you increase/decrease the output force in a reverse motion linkage

You can increase or decrease the output force by adjusting the lengths of the input and output arms, closer or further from the fixed pivot

What is a bell crank linkage

A bell crank linkage is a mechanical device used to change the direction of force or movement, typically converting linear motion to rotary motion the output is at 90 degrees to the input motion.

What is the equation for the velocity ratio of a pulley system

Diameter of the driven pulley / the diameter of the driver pulley.

If the diamater of the driven pulley is 30cm and the diameter of the driven pulley is 10cm what is the velocity ratio

(30cm / 10cm = 3).

If the velocity ratio is 5 and the diamater of the driven pulley is 10cm what is the velocity ratio

(10cm / 5 = 2cm).

What is the equation of the diven pulley

RPM of driver pulley / velocity ratio

If the RPM of the driver pulley is 15 and the velocity ratio is 5 what is the speed of the driven pulley

15 RPM / 5 = 3 RPM

If the diamater of the Driver pulley is 10cm and has an RPM of 15 and the driven pulley has a diamater of 20 what is the speed of the driven pulley

(20 / 10) * 15 RPM = 30 RPM

What type of motion does a crank and slider convert to

rotary motion to reciprocating motion

How do you calculate the RPM of the driven gearr

RPM of the driver gear / gear ratio.

If the RPM of the driver gear is 25 and the gear ratio is 10 what is the RPM of driven gear

25 RPM / 10 = 2.5 RPM

What is an idler gear

It helps maintain the direction of rotation between gears.

What are bevel gears

Bevel gears are gears that allow transfer of motion at 90 degrees.

What are rack and pinion gears

Rack and pinion gears convert rotational motion into linear motion,