1.5 Mechanical Devices Flashcards
What are the types of motion?
- Linear
- Rotary
- Reciprocating
- Oscillating
What is linear motion?
movement in a straight line, such as on a paper trimmer.
What is rotary motion?
movement round in a circle, such as a wheel turning
What is reciprocating motion?
movement backwards and forwards in a straight line, such as the movement of the needle on a sewing machine
What is oscillating motion?
movement swinging from side to side, such as a pendulum in a clock
What is a lever?
a mechanism that moves around a fixed point (a pivot)
What is a load?
the object to be moved
What is the effort?
the force applied to move the load
What is the fulcrum?
the point where the load is pivoted
What is a class 1 lever?
a lever where the fulcrum is located between the load and the effort, e.g., a seesaw
What is a class 2 lever?
the load is between the effort (force) and the fulcrum, e.g., a wheelbarrow
What is a class 3 lever?
the fulcrum is at one end and the force is applied in the middle and the weight is on the other end, e.g., cooking tongs
What are linkages?
mechanisms that transfer force and can change the direction of movement
What are the properties of a simple linkage?
- change the direction of motion and force
- change the size of the output motion compared to the size of the input motion
- create parallel motion
- change one type of motion into another type of motion
What are the properties of a simple linkage with the pivot closer to the output end of the level?
- change the direction of motion and force
- change the size of the output motion compared to the size of the input motion
- change the size of the output force compared to the size of the input force
