Q4_L27 SIMPLE MACHINES PPT

What is a machine?

• A device that requires a lot of energy

• A tool that makes work harder

• A tool that simplifies work

• A device that complicates work

How many types of simple machines are there:

wheel and axle

lever

screw

wedge

inclined plane

pulley

• 3

• 4

• 6

• 5

What is the formula to calculate work?

• Volume x Density

• Force x Distance

• Mass x Acceleration

• Speed x Time

What is the unit of work?

• Newton

• Meter

• Watt

• Joule

Which type of lever has the fulcrum between the effort force and the load?

• Second Class Lever

• None of the above

• Third Class Lever

• First Class Lever

What does a fixed pulley change?

Clue:

if you pull the rope down, the load goes up

• Amount of force applied

• Direction of the force

• Both A and B

• None of the above

What is the function of a wheel and axle?

• Increase the force required

• None of the above

• Reduce the force required

• Change the direction of force

Which simple machine is a ramp an example of?

• Lever

• Pulley

• Wedge

• Inclined Plane

What is the function of a wedge?

• Lifting heavy objects

• Joining two objects together

• Splitting an object apart

• None of the above

What is the purpose of a screw in machines?

• To reduce friction

• To hold objects together

• To change direction

• To increase speed