Simple Machines

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? (work = distance x force)

• 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 hill
• using a rope and 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

Tags

NGSS.MS-PS2-1

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

• friction
• gravity
• input force
• reaction force

Tags

NGSS.MS-ETS1-1

Which is a simple machine?

• baseball bat
• bicycle
• can opener
• car

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

Tags

NGSS.MS-PS2-2

The mechanical advantage available from a pulley could best help in which situation?

• pushing a car
• rotating a wheel
• flying an airplane
• lifting an elevator

Tags

NGSS.MS-PS2-4

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

NGSS.MS-PS2-4