Which force acts between two surfaces to prevent or slow motion

Determine the centripetal force acting upon a 40-kg child who swings in a circle at a speed of 3 m/s. The radius of the swing is 20m.

The process by which a gas changes to a solid is

A battery with internal resistance r is connected to a load resistance R. If R is increased, does the terminal voltage of the battery increase, decrease, or stay the same?

Our solar system belongs to the Milky Way galaxy. Which of the following terms describes the Milky Way's classification? A. spherical galaxy B. spiral galaxy C. irregular galaxy D. elliptical galaxy

Advantages of hubble law

According to the Theory of Continental Drift, what did the Earth's continents look like 255 million years ago?

What is the emf of a battery that increases the electric potential energy of 0.060 CC of charge by 0.70 JJ as it moves it from the negative to the positive terminal?

Why is gravitational potential energy negative?

What will happen to this current if a magnet is brought near the cord?

The kinetic energy of a sliding block came from the: kinetic energy of the string. kinetic energy of the board. gravitational potential energy of the block. gravitational potential energy of the mass on the hook.