Mrs. Vandenbos' Work and Simple Machines 2022

Which of the following is a requirement for work to be done?

• Force is exerted.
• Object is carried.
• Force moves an object.
• Machine is used.

A painter lifts a can of paint that weighs 48 Newtons a distance of 3 meters. How would you calculate how much work he does?

• 3m ÷ 48N
• 48N ÷ 3m
• 48N × 3m
• none of the above

Which is an example of how a simple machine changes the direction of a force?

• using a rope to pull a box up a ramp

• using a rope and fixed pulley to raise a flag

• using a slide to push a box down steps
• using an axle and wheel to make a wagon move forward

What causes the efficiency of a machine to be less than 100%?

• friction
• gravity
• input force
• reaction force

Tags

NGSS.MS-ETS1-1

Which of the following is a form of the inclined plane?

• pulley
• screw
• wheel and axle
• lever

Which simple machine would most likely increase the distance and reduce the force needed for a rolling cart to be moved up three steps?

• lever
• screw
• pulley
• inclined plane

Which statement correctly explains a compound machine?

• A compound machine is made up of one or more simple machines
• A compound machine is made up of two or more simple machines.
• A screw is a type of inclined plane.
• None of the above

The greatest amount of force is required to move the metal block up which inclined plane?

• A
• B
• C
• D

Tags

NGSS.MS-PS2-2

A log splitting machine was invented to split logs quickly. A motor powers a metal piece resembling an axe that is pushed through the middle of a log. The metal piece used to split a log is an example of what simple machine? 

• wedge
• pulley
• screw
• lever

The picture shows the inside of a watch. This watch uses both a battery and a simple machine to measure time. The arrow points to the simple machine inside the watch. What simple machine helps make the watch measure time? 

• a wheel and axle 
• an inclined plane 
• a screw 
• a lever