Question

1) potential energy+kinetic energy is equal to
A. Gravitational potential energy
B. Thermal energy
C. Chemical energy
D. Mechanical emergy

2) …….. is the study of the composition & properties of matter
A. Ecology
B. Biology
C. Chemistry
D. Model
E. Atoms

3) building blocks of matter are called…
A. Mass
B. RNA
C. Neutrons
D. Atoms
E. Protons

4)the force you apply to a machine is the..
A. Efficiency
B. Input force
C. Output force
D. Resistance

5) friction within machinery increases efficiency
A. True
B. False
Please help<3

Answer 1

Explanation:

1) D.

the other answer options don't make any sense in that regard. these 2 forms of energy represent in total mechanical energy.

2) C. Chemistry

3) D. Atoms.

although, protons and neutrons are part of them.

4) B. Input force

5) B. False

friction causes energy to be diverted to doing unwanted and unnecessary things, like creating heat instead of movement.