Simple Machines Chapter 16 Review Lets Get Started

Simple Machines Chapter 16 Review Let’s Get Started!

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 is a screwdriver? A. Inclined plane B. Lever C. Pulley D. Wheel-and-axle

D. Wheel-and-axle

Sally is making a poster to show pictures of levers. Which object should NOT be on her poster? A. Nail B. Rake C. Broom D. Crowbar

A. Nail

Which of these is not an example of work? A. Lifting a book B. Opening a door C. Drawing with a marker D. Adding numbers in your head

D. Adding numbers in your head

A screw is made of a post and another kind of simple machine. What is that other kind of simple machine? A. Inclined plane B. pulley C. wedge D. Wheel-and-axle

A. Inclined plane

How is the shovel being used in this picture? A. As a wheel-and-axle B. As a wedge C. As an inclined plane D. As a lever

D. As a lever

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

B. Wedge

A jar lid has threads. These threads help hold the lid tightly on the jar. What simple machine is a jar lid? A. lever B. pulley C. wedge D. screw

D. Screw

Mr. H is telling his class about the human body. He describes how some athletes lift weights to make their arms stronger. An athlete holds a weight in her hand bends her arm at the elbow. The elbow acts as a fulcrum. In this example, the arm is a simple machine. Which machine is it? lever B. pulley C. screw D. Wheel-and-axle A.

A. lever

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

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

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

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

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

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

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

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