# Physics Midterm Exam Review Quiz

18 Questions | Total Attempts: 148  Settings  A quiz to help review for the midterm exam.

• 1.
How do you find the mechanical advantage of a lever? Remember to include units in your answer.
• 2.
Describe the three classes of levers. Include the location of the fulcrum and the amount of force that is input and output for each class.
• 3.
How do you fid the gear ratio?
• 4.
How do you find the mechanical advantage of a ramp?
• 5.
How do you find the mechanical advantage of a screw?
• 6.
Efficiency is measured in percentages. Why is no machine 100% efficient? Copy the text below (including the dashes), paste it into your answer and then use one word.Some energy is lost to ________ in all machines.--
• 7.
The efficiency is less than 100% for virtually all process that do what?
• 8.
A simple machine has a mechanical advantage of 5. If the output force is 10N, what is the input force?
• 9.
Which of the following is a calculation of work?
• A.

Work (j) = Forece (N) x distance (m)

• B.

Work (j) = Forece (N) / distance (m)

• C.

Work (N) = Forece (j) x distance (m)

• D.

Work (N) = Mass (kg) x Gravity x Height (m)

• E.

Both 'A' and 'D' are correct.

• 10.
In the image above, what hand does more work.
• A.

A

• B.

B

• C.

C

• D.

A & B are equal and are greater than C

• E.

No work is done using these three forces.

• 11.
Alexander has a mass of 70 kilograms. HIs apartment is on the second floor, 5 meters up from ground level. How much work does he do against gravity each time e clims the stairs to his apartment?
• A.

70N

• B.

9.8N

• C.

5m

• D.

686N

• E.

None of the above

• 12.
Power is measure in _______, because the man who invented the steam engine was named ______ _____.  Power (P) is equal to ______ ______ by ______.
• A.

Joules; James Joule; mass; multiplied; distance

• B.

Newtons; Isaac Newton; time; multiplied; distance

• C.

Newtons; Isaac Newton; mass; divided; distance

• D.

Kilograms; Ken Kilo; work; divided; time

• E.

Watts; James Watts; work; divided; time

• 13.
What is a device with moving parts that work together to accomplish a task?
• A.

Gear

• B.

Pulley

• C.

Machine

• D.

Wheel and axel

• E.

Lever

• 14.
In a machine, the ______ ______ in newtons, or the force that the machine applies to what you are trying to move, divided by the _____ _____ in newtons, or the force you apply to the machine, is known as the ______ ______ of the machine.
• A.

Input force; output force; work done

• B.

Input force; output force; power used

• C.

Output force; input force; work done

• D.

Output force; input force; power used

• E.

Output force; input force; mechanical advantage

• 15.
The _____ _____ of a machine can never be _____ than the ______ ______. When you design a machine that multiplies force, you pay by having to apply the force over a ______ distance.
• 16.
The force in a rope is called the ____.
• 17.
When we measure how close to perfect a machine is, we are measuring its _____.
• 18.
Any process that is not 100% efficient is ___________
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