Simple MachinesSimple MachinesChapter 16 Review

Using force to move an object

work

A bar that turns on a fixed point

lever

Two inclined planes placed back to back

wedge

A wheel with a rope around it

pulley

A simple machine that makes moving or lifting things easier

Inclined plane

A simple machine that is like a nail with threads wrapped around it

screw

The fixed point on a lever

fulcrum

A machine that needs only one force to make it work

Simple machine

What type of simple machine What type of simple machine is a screwdriver?is a screwdriver?

A.Inclined planeB.LeverC.PulleyD.Wheel-and-axle

D. Wheel-and-axle

Sally is making a poster to Sally is making a poster to show pictures of levers. show pictures of levers. Which object should NOT be Which object should NOT be on her poster?on her poster?

A.NailB.RakeC.BroomD.Crowbar

A. Nail

Which of these is not an Which of these is not an example of work?example of work?

A.Lifting a bookB.Opening a doorC.Drawing with a markerD.Adding numbers in

your head

D. Adding numbers in your head

A screw is made of a post A screw is made of a post and another kind of simple and another kind of simple machine. What is that other machine. What is that other kind of simple machine?kind of simple machine?

A.Inclined planeB.pulleyC.wedgeD.Wheel-and-axle

A. Inclined plane

How is the shovel being How is the shovel being used in this picture?used in this picture?

A.As a wheel-and-axleB.As a wedgeC.As an inclined planeD.As a lever

D. As a lever

Charlie’s class is learning about simple machines. Charlie’s class is learning about simple machines. His teacher has written the names of four simple His teacher has written the names of four simple machines in a table on the board. As she points to machines in a table on the board. As she points to each name, Charlie gives an example of that each name, Charlie gives an example of that machine. She writes down what he says. Which machine. She writes down what he says. Which simple machine is correctly paired with its simple machine is correctly paired with its example?example?

A. leverB. wedgeC. inclined planeD. pulley

B. Wedge

A jar lid has threads. These A jar lid has threads. These threads help hold the lid threads help hold the lid tightly on the jar. What tightly on the jar. What simple machine is a jar lid?simple machine is a jar lid?

A.leverB.pulleyC.wedgeD.screw

D. Screw

Mr. H is telling his class about the human body. He Mr. H is telling his class about the human body. He describes how some athletes lift weights to make their describes how some athletes lift weights to make their arms stronger. An athlete holds a weight in her hand arms stronger. An athlete holds a weight in her hand and bends her arm at the elbow. The elbow acts as a and bends her arm at the elbow. The elbow acts as a fulcrum. fulcrum.

In this example, the arm is a simple machine. Which In this example, the arm is a simple machine. Which machine is it?machine is it?

A. leverB. pulleyC. screwD. Wheel-and-axle

A. lever

Linus needs to keep a door Linus needs to keep a door propped open. Predict propped open. Predict which simple machine Linus which simple machine Linus will choose to do the job. will choose to do the job. Explain.Explain.

Linus will choose a wedge. Linus will choose a wedge. He will push the wedge He will push the wedge between the door and the between the door and the floor. The wedge will keep floor. The wedge will keep the door open.the door open.

Interpret the pictures to Interpret the pictures to decide which screw is decide which screw is easier to turn. Explain.easier to turn. Explain.

Screw A is easier to turn Screw A is easier to turn because it has threads that because it has threads that are closer together.are closer together.

The pictures show two The pictures show two simple machines. Tell how simple machines. Tell how the machines are alike.the machines are alike.

Both are Both are simple machines simple machines that can be that can be used to raise an used to raise an objectobject. .

Snoopy has made two Snoopy has made two ramps. Ramp A is steeper ramps. Ramp A is steeper than Ramp B. Which ramp than Ramp B. Which ramp will make it easier for will make it easier for Snoopy to move the block Snoopy to move the block of wood? Tell how you of wood? Tell how you know.know.

Ramp B will be easier, Ramp B will be easier, because it is less steep. because it is less steep. This means Snoopy will use This means Snoopy will use less force to push the block less force to push the block of wood up Ramp B than up of wood up Ramp B than up Ramp A.Ramp A.