PHYSICS MIDDLE SCHOOL

In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction and breaking) Check all that apply.Child on a swing

Pendulum

Bow and Arrow

Roller Coaster

Answers

Answer 1

Answer:

Answer:

Neglecting, air resistance, friction and breaking, all the condition has conservation of mechanical energy.

Explanation:

The law of conservation of mechanical energy suggests that the mechanical energy in a locked system with out any destructive forces like friction or air resistance remains always the same (constant).
The energy may be converted between kinetic energy, potential energy, gravitational potential but energy do not get decreased in any cases as mentioned in the option.
So all the cases mentioned above shows the conservation pattern of mechanical energy.

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What type of energy is formed when an object encounters friction?

Answers

Answer:

thermal energy

Friction does negative work and removes some of the energy the person expends and converts it to thermal energy. The net work equals the sum of the work done by each individual force. The forces acting on the package are gravity, the normal force, the force of friction, and the applied force.

Explanation:

Answer:

Explanation:

Thermal energy due to heat coming in from rubbing like rubbing your hand and it feel warm

Can black holes merge

Answers

It is possible for two black holes to collide. Once they come so close that they cannot escape each other's gravity, they will mergeto become one bigger black whole.

How do fission nuclear reactions differ from fusion nuclear reactions? Fission reactions involve the conversion of matter into energy, but fusion reactions do not. Fusion reactions involve the conversion of matter into energy, but fission reactions do not. Fission reactions are used to generate electricity for consumers, but fusion reactions are not. Fusion reactions are used to generate electricity for consumers, but fission reactions are not.

Answers

How do fission nuclear reactions differ from fusion nuclear reactions?

A. Fission reactions involve the conversion of matter into energy, but fusion reactions do not.

B. Fusion reactions involve the conversion of matter into energy, but fission reactions do not.

C. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.

D. Fusion reactions are used to generate electricity for consumers, but fission reactions are not.

Answer:

Explanation:

Both fission and fusion are nuclear reactions that produce energy, but their applications differs.

Fission is the splitting of a large (heavy, unstable) nucleus into smaller ones, and fusion is the process where nuclei of small atoms are combine together to form the nuclei of larger atoms releasing vast amounts of energy.

The correct answer is c. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.

The physics of fusion is the process that makes the sun shine, and that makes the hydrogen bomb explode.

Answer:

Explanation:

The force that one surface exerts on another when the two rub against each other is calledA. friction.
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

Answers

1. Friction (Example: when you rub your hands together and you start to feel heat.)

2. Attract each other. (Example: Every object has a gravitational pull of some sort. The larger the object, the stronger the gravitational pull. This is why the sun is able to keep all eight planets in orbit around it.)

3. Hope this helped :)

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