Machines
Which of the following is a simple machine?
A lever
What is the law of conservation of energy?
Energy cannot be created nor destroyed.
What is the definition of a system in terms of energy?
A region or set of regions around which a boundary can be defined.
Which law states that energy cannot be created or destroyed?
Law of conservation of energy
What is the sum of potential energy and kinetic energy in a system called?
Mechanical energy
What is a compound machine?
A combination of two or more simple machines
Which of the following is a type of potential energy?
Elastic potential energy
What is the formula for kinetic energy?
KE=12mv2
Which of the following is NOT a form of energy?
Frictional energy
Which of the following can a machine NOT do?
Create energy
How is efficiency defined in the context of machines?
The ratio of output work to input work
Which of the following best describes mechanical energy?
The sum of all potential and kinetic energies in a system.
Which of the following is an example of elastic potential energy?
A stretched rubber band.
What is the formula for calculating work done when a force is applied?
Work = Force × Distance
What is the primary function of a machine in terms of work?
To make work easier by changing the force
If a machine has an efficiency of 50%, what does this mean?
The machine converts 50% of input work into output work.
Which of the following is an example of gravitational potential energy?
A book on a shelf.
Which of the following is a form of potential energy?
Gravitational potential energy
What is the unit of power in the International System of Units (SI)?
Watt
What type of energy is associated with the motion of an object?
Kinetic energy
Which of the following best describes a machine?
A device that changes the force or increases the motion from work.
What is power in terms of energy?
The rate at which energy is converted from one form to another.
What is kinetic energy?
Energy that a moving object has because of its motion
Which of the following is an example of a compound machine?
A pair of scissors.
Which of the following is a correct statement about energy?
Energy can be transferred and transformed