B. acceleration.
C. inertia.
D. gravity.
The law of universal gravitation states that any two objects in the universe that have mass, without exception,
A. attract each other.
B. repel each other.
C. combine to provide a balanced force.
D. create friction.
ANswer both
the size of the atoms
B.
the hardness of the material
C.
the behavior of the molecules
D.
the weight of the material
Answer:
c
Explanation:
B.Complex Machine
C.Compound Machine
D.Simple Machine
A rake is a simple machine. Thus, the correct option is D.
A simple machine is a mechanical device which changes the direction or magnitude of an applied force. In general, these machines can be defined as the simplest mechanisms which uses mechanical advantage also called as leverage to multiply the force. Usually the term refers to the six classical simple machines which were defined by Renaissance scientists including lever, wheel and axle, pulley, inclined plane, wedge, and screw.
A simple machine uses a single applied force to do the work against a single load force or friction. Ignoring the friction losses, the work done on the load force is equal to the work done by the applied force.
Therefore, the correct option is D.
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