Simple machines quiz

The diagram represents a person using a wheelbarrow to move a heavy load of soil.

Which two simple machines are parts of the wheelbarrow?

• a lever and a pulley

• a lever and a wheel and axle

• an inclined plane and a pulley

• an inclined plane and a wheel and axle

The diagrams below represent four simple machines. The arrows in each diagram indicate the direction of the force being applied. Which machine is changing the direction of the force being applied by the person?

• 
• 
• 
• 

The diagram represents a person using a lever. The person applies force to the lever to change the rock’s ________

• flexibility

• size

• weight

• position

The diagram represents a person pushing a 50-kg box up a ramp. Which two simple machines are being used in the diagram?

• inclined plane; pulley

• inclined plane; wheel and axle

• lever; pulley

• lever; wheel and axle

Which force will decrease if the surface of the ramp is made smoother?

• gravity

• friction

• magnetism

• electricity

Which type of energy is transferred from one object to another by simple machines?

• mechanical energy

• chemical energy

• nuclear energy

• electric energy

Tags

NGSS.MS-PS3-5

When an output force occurs over a shorter distance than an input force, which is true?

• The output force and input force are equal.

• The output force is less than the input force.

• The output force is greater than the input force.

• The answer depends on the direction of the output force.

The efficiency of all machines is _______.

• less than 100 percent

• exactly 100 percent

• more than 100 percent

• impossible to calculate

Which feature cannot be changed by a machine?

• The amount of work needed to accomplish a task

• The ease with which you can accomplish a task

• The direction of force used to accomplish a task

• The amount of force used to accomplish a task

What is the efficiency of the pulley shown here?

• 76 %

• 80 %

• 90 %

• 95 %

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-5