1. Forces can be categorized into two different groups. They are:

    friction and contact forces

    contact and action-at-a-distance forces

    weight and mass

    friction and action-at-a-distance forces

2. Gravity could best be categorized as

    an action-at-a-distance force

    a contact force

    a friction force

    a mass force

3. The force of friction is best described as

    a magnetic force

    an action-at-a-distance force

    a force that opposes the motion of an object

    a pulling force

4. Use this graph to answer questions 4 & 5. Which of the following is the correct statement regarding Planet C?

    An astronaut on Planet C would weigh more than on Earth.

    An astronaut on Planet C would weigh less than on Earth.

    The mass of an astronaut on Planet C is greater than on Earth.

    The gravitational field on Planet C is less than Planet A.

5. Which of the following is the correct statement regarding the three planets?

    The gravitational field on Planet A is greater than on Planet C.

    The mass of Earth is greater than Planet A.

    The gravitational field on Earth is greater than Planet A.

    The gravitational field on Earth is greater than Planet C.

6. Which of the following forces transforms kinetic energy into thermal energy?

    gravitational force

    frictional force

    magnetic force

    electrical force

7. What is the amount of work done by a motorcycle engine if it exerts a force of 1000 N to move the bike a distance of 50 m?

    20 J

    0.05 J

    50 000 J

    5 000 J

8. A nutcracker is a mechanical device that makes work easier by

    decreasing the output force

    increasing the output force

    increasing the distance over which the force is applied

    changing the direction of the applied force

9. A ramp is a mechanical device that makes work easier by

    decreasing the input force

    increasing the input force

    decreasing the distance over which the force is applied

    changing the direction of the force

10. Which of the following statements about a first-class lever is true?

    The output force is in the opposite direction of the input force.

    The ideal mechanical advantage is always greater than 1.

    The ideal mechanical advantage is always less than 1.

    The output force is in the same direction as the input force.

11. A pulley with three support ropes has an ideal mechanical advantage of

    1

    2

    3

    4

12. A wheelbarrow is an example of which two simple machines?

    a first-class lever and a pulley

    a second-class lever and a wheel and axle

    a third-class lever and a ramp

    a third-class lever and a wheel and axle

13. Which of the following statements regarding a ramp is true?

    The ideal mechanical advantage of a ramp is always less than 1.

    The input force is always greater than the output force.

    It is not a type of simple machine.

    The input force is always less than the output force.

14. The following will best increase efficiency:

    friction

    lubricant

    heat

    cold

15. The screw is most similar to which other simple machine?

    a ramp

    a pulley

    a second-class lever

    a wheel and axle

16. Which of the following statements is true regarding mechanical advantage (MA) and ideal mechanical advantage (IMA)?

    For any machine, its mechanical advantage (MA) will always be greater than its ideal mechanical advantage (IMA).

    For any machine, its mechanical advantage (MA) will always be less than its ideal mechanical advantage (IMA).

    The ideal mechanical advantage (IMA) is determined using the formula IMA=F in/F out.

    The ideal mechanical advantage (IMA) is determined using the formula IMA= F out/ F in.

17. Ancient Egyptians built the pyramids using simple machines. Which simple machines are being employed in the picture?

    ramp and pulley

    wedge and wheel and axle

    wheel and axle and a ramp

    lever and ramp

18. In a school system, the organizational component is:

    principal

    teacher

    government

    student

19. The consumer in a school system is

    principal

    teacher

    government

    student

20. For what reason are most non-mechanical systems created?

    to create jobs in the society

    to meet a need or solve a problem

    to create businesses and organizations

    to create mechanical systems

21. Which of these components of a library system could be classified as information and support?

    the person who borrows a library book

    the automated checkout system

    the librarian

    the organization of the books in the library

22. What is the main reason automated components are used in non-mechanical systems?

    Automated components make the system more efficient.

    Automated components cost less.

    Automated components do not need to be replaced.

    Human workers are not as versatile.

23. The use of automated systems usually involves the loss of jobs. This would have the greatest impact on

    the environment

    society

    the economy

    technology

24. Which of the following statements is a quantitative observation?

    A car has passenger-side air bags.

    A car consumes 8.2 L of gas per 100 km.

    A car emits few pollutants.

    Farmer Brown loves Fords.

25. Which of the statements is a qualitative observation?

    The car has passenger side airbags.

    The car consumes 8.2 L of gas for every 100 km.

    The car costs $23 000.

    Meow!

26. What is a disadvantage of mass production?

    Items are made faster.

    Items are often of lower quality.

    Items are made for less cost.

    Productivity is increased.

27. The following are three statements used to describe work. I. Work is done only if an object moves through a distance. II. Work is done only if energy is transferred from one form to another. III. Work is done only if a force is applied.

    I only

    I and II only

    II and III only

    I, II, and III

28. The metric unit for force is

    gram (g)

    newton (N)

    litre (L)

    kilogram (kg)

29. Scissors are an example of which two machines?

    ramp and first-class lever

    wedge and first-class lever

    wedge and wheel and axle

    ramp and wheel and axle

30. Mechanical advantage is best described as:

    the ability to do work.

    the ratio of output force to input force.

    a force that opposes the motion of an object.

    the force of gravity.

31. Kinetic energy is:

    action at a distance force.

    force x distance.

    energy of a moving object.

    the amount of matter in an object.

32. Efficiency is best described as:

    the mechanical advantage of a machine without friction

    work a machine is designed to perform

    the ratio of useful output work to input work

    grooved wheel with a rope looped around it

33. The teeter-totter is an example of:

    second class lever

    wheel and axle

    first class lever

    ice cream