Work and Simple Machines - Day 2

Work and Simple Machines - Day 2

Multiple Choice

Review Question: A woman uses a force of 15,000 newtons to push a shopping cart a distance of 350 meters. What was the work done by the woman?

• 350 J

• 42.9 J

• 15,000 J

• 5,250,000 J

• Inclined Plane

• Wedge

• Screw

• Lever

• Wheel and Axle

• Pulley

The Six Simple Machines

Machines make work easier by:

• Changing the size of the force you apply

• Changing the direction of the force

How Machines Make Work Easier

Open Ended

How does an inclined plane make work easier?

Open Ended

The blade of an axe is a type of wedge. How does it make it easier to chop a piece of wood?

Poll

The motion of a screw is:

• Vertical (up and down)

• Rotating (Twisting)

Open Ended

How does a lever make work easier?

Open Ended

How does a wheel an axle make work easier?

Open Ended

A pulley makes work easier and changes the direction of the force. Why are both of those important?

• Compound Machine - a machine made of two or more simple machines

• Can opener – example

  • A screw, a lever, and a wedge

Compound Machines

Open Ended

Scissors are an example of a compound machine. What are at least two simple machines in a pair of scissors?