Which statements are true?
A.
A wheel & axle is a simple machine.
B.
A simple machine has only one kind of motion.
C.
We use simple machines so we don't have to do as much work.
D.
A simple machine can change the direction of force.
E.
A simple machine can change the amount of force.
The true statements are:
A. A wheel & axle is a simple machine.
C. We use simple machines so we don't have to do as much work.
D. A simple machine can change the direction of force.
E. A simple machine can change the amount of force.
A. A wheel & axle is a simple machine - True
B. A simple machine has only one kind of motion - False
C. We use simple machines so we don't have to do as much work - True
D. A simple machine can change the direction of force - True
E. A simple machine can change the amount of force - True
To determine which statements are true, we can analyze each statement individually.
A. A wheel & axle is a simple machine.
To answer this question, we can start by understanding what a simple machine is. A simple machine is a mechanical device that helps to make work easier by reducing the amount of force required or changing the direction of force. A wheel & axle is a type of simple machine that consists of a circular wheel attached to a smaller cylindrical axle, and it enables the transfer of force from one point to another. Therefore, Statement A is true.
B. A simple machine has only one kind of motion.
To determine the accuracy of this statement, we should consider that the term "simple machine" refers to a broad category of tools or devices that assist in performing work. Different simple machines have different functions and mechanisms. For example, pulleys and levers have a rotating or swinging motion, while inclined planes and wedges have linear motion. Since there are various types of simple machines with different motions, Statement B is false.
C. We use simple machines so we don't have to do as much work.
This statement is generally true. Simple machines are designed to reduce the amount of force required to perform a task. By utilizing mechanical advantage, simple machines allow us to accomplish tasks using less energy and effort than if we were to do the work directly. Therefore, Statement C is true.
D. A simple machine can change the direction of force.
This statement is true. One of the fundamental functions of a simple machine is to change the direction of force. Examples of simple machines that can change the direction of force include levers and pulleys. Levers can redirect forces applied at one end to the other end, while pulleys can change the direction of forces applied using ropes or cables. Therefore, Statement D is true.
E. A simple machine can change the amount of force.
This statement is true. Another essential characteristic of simple machines is their ability to alter the amount of force required for a task. Some simple machines, such as levers and pulley systems, provide mechanical advantage, which allows a smaller force to accomplish more significant work. Other types, such as inclined planes and ramps, can reduce the force needed to move heavy objects. Thus, Statement E is true.
In summary, the true statements are:
A. A wheel & axle is a simple machine.
C. We use simple machines so we don't have to do as much work.
D. A simple machine can change the direction of force.
E. A simple machine can change the amount of force.