Simple Machines Warm Up

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 done = Force X distance

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

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

• friction
• Gravity
• Input force
• reaction force

Tags

NGSS.MS-PS3-3

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Which is a simple machine?

• Baseball bat
• can opener
• bicycle
• car

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

• pulley
• screw
• wheel and axle 
• lever

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 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-PS2-1

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

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