A. Answer the following
questions in brief.
1. What is a machine?
2. Roads on hills are made to have very gentle slopes. Why?
3. List two ways in which a screw is more useful than a nail.
4. Name the three parts of a lever.
5. What is a wedge?
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Answers
Answer:
hey mate here is your answer
parts of lever
1.falcrum
2.effort
3.load
HOPE IT HELPS YOU
Answer:
a.machie is the result of human brain which make our work easier.
bt some machines require electricity for running.
b. The roads on hills are gently sloping in order to reduce the effect of steepness which causes more downward gravitational pull on the vehicle. A steeper sloped road would slow the car down to a greater extent that an gently sloping one. So, we have in effect reduced the undesirable effect of gravity by doing so
c. screw can hold or join the pieces of wood very strongly than a nail. A screw has the rivets around the point and you would use a screw driver to remove or use one, it's usually used on things like hanging dry wall. A nail is smoother and you would use a hammer to use or remove it.
d.There are three parts to all levers: • Fulcrum - the point at which the lever rotates. Input force (also called the effort) - the force applied to the lever. Output force (also called the load) - the force applied by the lever to move the load. There are three types of levers: first class, second class and third class.
e.A wedge is a triangular shaped tool, and is a portable inclined plane, and one of the six classical simple machines. It can be used to separate two objects or portions of an object, lift up an object, or hold an object in place.
hope it's helpful to you
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