Work and Simple Machines

The kinetic energy of a swing as it is moving increases as its ____ decreases
1. velocity
2. potential energy
3. speed
4. mechanical energy
The ability to cause change:
1. work
2. energy
3. kinetic energy
4. potential energy
Energy of motion is called:
1. thermal energy
2. potential energy
3. kinetic energy
4. mechanical energy
The basic SI unit of energy is the:
1. newton
2. kelvin
3. kilogram
4. joule
Which of these does not represent work done on a rock in the scientific sense?
1. lifting a rock
2. throwing a rock
3. dropping a rock
4. holding a rock
What is the formula for work?
1. speed times distance
2. force times velocity
3. mass times force
4. force times distance
Which of the following is an exampe of potential energy of position?
1. a flower pot sitting on a window sill
2. a flower pot falling from a window sill
3. a basketball bouncing off a wall
4. a basketball rolling across the floor
Kinetic energy is directly related to:
1. mass
2. the object's condition
3. position
4. force
What does the law of conservation of energy state?
1. Particles with a high kinetic energy are moving faster.
2. The amount of kinetic energy of an object is equal to the amoung of potential energy of the object.
3. Under normal conditions, energy cannot be created or destroyed.
4. All matter is made up of tiny particles that are in constant motion.
What is the transfer of energy through motion called?
1. potential energy
2. kinetic energy
3. law of conservation of energy
4. work
Stored energy is what type of energy?
1. potential energy
2. kinetic energy
3. mechanical energy
4. all the above
The force applied by a machine is called the:
1. effort force
2. applied force
3. resistance force
4. mechanical force
A bar that pivots about a fixed point is what type of simple machine?
1. pulley
2. wedge
3. inclined plane
4. lever
Multiplying resistance force by resistance distance will tell you a machine's ________.
1. mechanical advantage
2. work input
3. work output
4. efficiency
In which of the following examples is work being done?
1. Carrying a book across the room while holding it a waist level.
2. Carrying a book up a flight of stairs while holding it waist level.
3. Standing still holding a book at waist level.
4. All of the above are examples of work.
The resistance force of a machine divided by the efforct force applied is used to calculate a machines' ____________.
1. efficiency
2. actual mechanical advantage
3. resistance distance
4. effort distance
The distance over which the effort force is applied to the machine is the:
1. effort distance
2. resitance distance
3. work input
4. work output
A simple machine is a device that does work with ____ movement(s).
1. no
2. one
3. two
4. two or more
Which of the following statements is TRUE?
1. Work input equals work output.
2. A machine can increase the amount of work you do.
3. There is an inverse (opposite) relationship between force and distance in a simple machine.
4. The ideal mechanical advantage and actual mechanical advantage of a machine are equal.
Machines make work easier by:
1. reducing the amount of force you need to apply by multiplying your force
2. increasing the speed or distance the object travels
3. changing the direction of a force
4. all the above
Work that is done on the machine (by you) is called:
1. work input
2. work output
3. mechanical advantage
4. effort force
A slanted surface used to raise an object is a(n):
1. inclined plane
2. efficiency board
3. effort ramp
4. pulley
The amount by which a machine multiplies an effort force is called the:
1. resistance force
2. efficiency
3. mechanical advantage
4. work input
What type of force is the weight of the object a simple machine is trying to move?
1. effort force
2. resistance force
3. ideal force
Which type of mechanical advantage is based on how many times the machine would multiply the effort force if there were no friction?
1. actual
2. ideal
3. simple
4. resistance

Work and Simple Machines

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