Explanation

G is the gravitational constant, also known as the universal gravitational constant.

It is a fundamental constant of nature that describes the strength of gravitational attraction between objects.

The currently accepted numerical value of G is 6.673 × 10^-11 Nm^2 kg^-2.

Explanation

Newton's law of universal gravitation states that every point mass attracts every other point mass by a force acting along the line intersecting both points.

This law applies to all objects in the universe, regardless of their size, shape, or composition.

Explanation

The motion of a falling ball towards Earth is due to the gravitational force.

Gravitational force is the force that attracts the ball towards the Earth, causing it to accelerate downwards.

Explanation

To find the pressure, you need to divide the force (20 N) by the area (5 cm^2).

Since 1 cm^2 = 0.0001 m^2, the area in square meters is:

5 cm^2 x (0.0001 m^2/cm^2) = 0.0005 m^2

Now, you can calculate the pressure:

Pressure = Force / Area = 20 N / 0.0005 m^2 = 40,000 N/m^2

Since 1 N/m^2 = 1 Pascal (Pa), you can convert the pressure to N/cm^2:

40,000 N/m^2 x (1 m^2 / 100 cm^2) = 4 N/cm^2

Explanation

Newton is a unit of force, not pressure.

The units of pressure are:

• Pascal (Pa) is the SI unit of pressure.
• Bar is a common unit of pressure, equal to 100,000 Pa.
• Atmosphere (atm) is a unit of pressure, equal to 101,325 Pa.

Explanation

If a spring stretches easily, it means that it requires less force to stretch it a certain distance.

This is indicative of a spring with a small spring constant (k).

The spring constant is a measure of a spring's stiffness.

A smaller value means the spring is less stiff and more easily deformed.

Explanation

Elastic deformation occurs when a material temporarily changes shape in response to an external force, but returns to its original dimensions when the force is removed.

This type of deformation is reversible, meaning the material returns to its original state.

Explanation

The springs in brakes and clutches are used to restore the original position of the components after they have been engaged or disengaged.

For example, in a brake system, the springs return the brake pads to their original position after the brake pedal is released.

Similarly, in a clutch system, the springs return the clutch plate to its original position after the clutch pedal is released.

Explanation

The stability of a racing car is increased by lowering its center of gravity, which reduces the risk of rollover or loss of control.

This can be achieved through design elements like a lower ride height, a wider stance, or a lower seating position for the driver.

Explanation

A tightrope walker carries a long pole to lower their center of gravity, making it easier to balance and maintain equilibrium.

By spreading their weight over a larger area (including the pole), they reduce the risk of toppling over.