Ch. 13 Flashcards
(25 cards)
A quantity that measures the rate at which work is done or energy is transformed.
Power
The transfer of energy to an object by the application of the force that causes the object to move in the direction of the force.
Work
A quantity that expresses how much a machine multiplies force or distance.
Mechanical advantage
One of the six basic types of machines which are the basis for all other forms of machines.
Simple machine
A machine made of one of more than one simple machine.
Compound machine
The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force is called…?
Work
A boy exerts an average force of 65 N when he lifts the box 1.2 m. How much work does he do?
78 J
______Is defined as the rate at which work is done.
Power
How much power is required to do 180J of working 2.4 s?
75 W
How much power is required to lift a 30.0 N chair 0.20 m in 2.0 s?
3.0 W
Calculate the mechanical advantage of a wrench that allows you to move a bolt 0.01 m by moving the handle 0.50 M
50
A ramp is a _______ that describes the force required to move an object While increasing the distance the object.
Machine
What is the mechanical advantage of a ramp 2.0 m long and .50 and talk?
4.0
A pulley with a mechanical advantage of 5.00 is used to live a bucket weighing 285 N. How much force must be used to lift the bucket?
57.0 N
Lifting a car using a car jack is easier because it requires…?
Less force
What are the two families of simple machines?
Inclined plane and lever
Levers are divided into_____classes based on the location of the fulcrum and of the input and output force.
Three
A wedge is a modified____?
Incline plane
A ramp is a simple inclined plane that allows one to apply and input force______the output force.
Less than
Which of the following is an example of a compound machine?
Scissors
What is a mechanical advantage of a single, fixed pulley?
1
A lever or pulley connected to a shaft is a…?
Wheel and axle
An example of a second-class lever is…?
Wheelbarrow
An inclined plane wrapped around a cylinder is a…?
Screw
