Types of Mechanisms
What is a lever?
A) A grooved wheel
B) A mechanism that transforms a circular motion into a linear one.
C) A rod that holds rotating elements in a solid manner
D) A bar and a fulcrum that transforms one movement of a bow into another
D) A bar and a fulcrum that transforms one movement of a bow into another
There is a mechanism with two gears. The first gear has 12 teeth and is rotating at a speed of 3 rpm. If the second gear has 6 teeth, then what is the speed of the second gear?
A) 3 rpm
B) 12 rpm
C) 9 rpm
D) 6 rpm
D) 6 rpm
(i = W1xZ1 = W2xZ2)
Which of the following is an example of a mechanism that includes a bar and fulcrum?
A) Lever
B) Fixed pulley
C) Rack and pinion
D) Gear
A) Lever
What is a cam?
A) A reversible mechanism that can transform a circular motion into a linear one or a linear motion into a circular one.
B) A mechanism that transforms its circular motion into a reciprocating motion depending on its shape
C) A rod with a shaft at one of its ends
D) A rod that holds rotating elements in a solid manner
B) A mechanism that transforms its circular motion into a reciprocating motion depending on its shape
There is a belt and pulley system. The first pulley has a diameter of 10 cm. If the diameter of the second pulley is 4 cm and it is rotating at a speed of 20 revolutions per minute, then what is the speed of the first pulley?
A) 4 rpm
B) 8 rpm
C) 6 rpm
D) 20 rpm
B) 8 rpm
(i = W1 x D1 = W2 x D2)
In a mechanism with gears, which gear goes faster?
A) The smaller gear
B) The bigger gear
C) Both gears go the same speed
A) The smaller gear
What is a rack and pinion?
A) A gear with weighted teeth.
B) A mechanism that transforms a circular movement of a screw into another perpendicular movement in the gear.
C) A reversible mechanism that can transform a circular motion into a linear one or a linear motion into a circular one.
D) A small gear.
C) A reversible mechanism that can transform a circular motion into a linear one or a linear motion into a circular one.
Two kids are sitting on a seesaw. The first kid is 4 meters from the fulcrum of the seesaw. If the first kid weighs 30 kg and the second kid weighs 20 kg, then how far would the second kid have to sit from the fulcrum in order to equilibrate the seesaw?
A) 5 meters
B) 6 meters
C) 4 meters
D) 8 meters
B) 6 meters
(F1 x L1 = F2 x L2)
What is the equation for the lever law?
A) F1 x F2 = L1 x L2
B) F1/L1 = F2/L2
C) F1 x L1 = F2 x L2
D) L1/L2 = F1/F2
C) F1 x L1 = F2 x L2
What is a Mobile Pulley?
A) A pulley that is attached to a fixed element and can roll, but not move
B) A reversible pulley that is attached to a fixed element and can make linear movements but cannot move sideways
C) A system that is a reversible mechanism and transforms a circular movement into another circular movement and can go in the same or opposite direction
D) A rod that holds rotating elements in a solid manner
B) A reversible pulley that is attached to a fixed element and can make linear movements but cannot move sideways
A crane is using a hoist to pull up a box that weighs 400 kg. How much force must be applied to the hoist to lift the box?
A) 400 kg
B) 100 kg
C) 50 kg
D) 200 kg
B) 100 kg
(F = R/4)
Which of the following is NOT an example of a reversible mechanism?
A) Worm Gear
B) Rack and pinion
C) Gear
D) Mobile Pulley
A) Worm Gear
What is a worm gear?
A) A mechanism that transforms a circular motion into a linear one.
B) A rod that holds rotating elements in a solid manner
C) A mechanism that transforms a circular movement of a screw into a perpendicular movement in a gear.
D) A mechanism that can transform a circular motion into a linear one or a linear motion into a circular one.
C) A mechanism that transforms a circular movement of a screw into a perpendicular movement in a gear.
A mobile pulley is being used to open the blinds. If the force applied to the pulley is 20 kg, then what is the most weight that the mobile pulley could lift?
A) 20 kg
B) 10 kg
C) 30 kg
D) 40 kg
D) 40 kg
What is transformed in a gear with chain?
A) A linear movement is transformed into a circular movement
B) A circular movement is transformed into a circular movement of the same direction
C) A circular movement is transformed into a circular movement in a different direction
D) A circular movement is transformed into a linear movement