 SEMATHS.ORG Updated: 8 August 2021 03:37:00 AM

# Why do we say that a spring is elastic??

Why do we say that a spring is elastic? Elasticity is the property of a material that allows it to change shape when a deforming force acts upon it and then return to its original shape. A weight hanging on a spring stretches the spring if removed it returns to its original length.

## Taking this into account how do you explain the saying the bigger they are the harder they fall using scaling?

How do you explain the saying "The bigger they are, the harder they fall" using scaling? A big creature has a small ratio of surface area to mass, so air resistance doesn't slow it as much when it falls. >> consequence of the small ratio of surface area to weight.

## Bearing this in mind which ball is more elastic?

When all three balls are dropped from the same height, the rubber ball will bounce the highest because it has the greatest elasticity. When the rubber ball hits the ground it gets compressed, or squished, and because it is very elastic, it quickly returns to its original shape.

## With this in view how is the extension of a spring determined?

For a given spring and other elastic objects, the extension is directly proportional to the force applied. For example, if the force is doubled, the extension doubles. When an elastic object is stretched beyond its limit of proportionality, the object does not return to its original length when the force is removed.

#### Why do we say work done against gravity is negative?

Direction of force in a gravity is always towards the centre of earth. And the direction of displacement is against the force exerted by the gravity. So both the force and displacement is in opposite direction. So the work done is negative.

#### Is spring constant negative?

The spring constant cannot be negative. Spring constant will always be a positive value. The negative sign in Hooke's law shows that the direction of the restoring force is opposite to the applied force.

#### Does Earth do work on the moon?

1 Answer. No,the work done in this case is zero. Now,here the radial force exerted on the moon by the earth i.e the attractive force due to gravity acts in a direction,perpendicular to which,the moon suffers the displacement during rotation.

#### What is the relationship between force constant K and spring force?

The force exerted by a spring on objects attached to its ends is proportional to the spring's change in length away from its equilibrium length and is always directed towards its equilibrium position. F = -kx. The proportional constant k is called the spring constant.

#### What is the work done by a spring?

The work done on a spring stores elastic potential energy U s U_s Us​U, start subscript, s, end subscript in the spring until the spring goes back to its original length. Therefore, U s U_s Us​U, start subscript, s, end subscript is equal to the work done and also to the area under the curve.

#### What is negative work class 9?

If the force and the displacement are in opposite directions, then the work is said to be negative. Negative work just means that the force and the displacement act in opposite directions.

#### Does gravitational force increase with height?

gravity increases with height. gravity is significantly less on high mountains or tall buildings and increases as we lose height (which is why falling objects speed up) gravity affects things while they are falling but stops when they reach the ground. It does not operate on things that are moving upwards.

#### Does gravity do positive or negative work on Moon?

The Moon revolves around the Earth in a nearly circular orbit, kept there by the gravitational force exerted by the Earth. Does gravity do positive work, negative work, or no work on the moon? So the work done on the Moon by Earth's gravity is zero.

#### Is spring force always positive?

No. It will not be always negative. If the particle connected to the spring is moving from extreme position towards mean position work done by spring force is possitive. If the particle is moving from mean position towards extreme position work done is negative.

#### How do you calculate GPE?

So to get the GPE of an object you need a formula, the formula is MASS X GRAVITY X HEIGHT (M X G X H).

#### What is zero work done with example?

1) A simple example of zero work is when you stand holding a bag in your hands and do not move it. Your hands apply a force on the bag to balance the force of gravity exerted on it but since there is no displacement of the bag, the work done on it by you (your force) and also the gravity is zero.

#### Is spring constant negative or positive?

k, being the spring constant, is always a positive number. the negative sign indicates that the restorative force is in the opposite direction of the applied force.

#### Why are attractive forces negative?

You would have learnt this thing in chemistry (In Atom Structure, you would have calculated energy of electrons for different energy levels b/w electron & proton(nucleus)), that attractive force reduces the energy of the electrons and repulsive force increases the energy of electrons) So since energy corresponding to

#### Can work done be 0?

Zero work is done when the displacement of a body is zero or perpendicular (θ=900,cosθ=0) to the direction of force applied, then work done is zero. Thus, the force applied and the displacement are in perpendicular directions. So, the work done is zero.

#### Can work done by spring force be zero?

Total work done by spring force may be positive, negative or zero. though we know that the spring force is always directed towards mean position and the spring force is always negative.

#### Can work done by gravity be positive?

If the object goes up (the height increases so Δh is positive) then the work done by gravity is negative and tries to make the object's KE decrease. If the object goes down (the height decreases so Δh is negative), the work done by gravity is positive so it tries to make the object's KE increase.

#### Why spring force is variable?

Hooke's Law states that the spring force for a compressed or stretched spring is equal in magnitude to the force for extension or compression of the spring. However, this spring force has an opposite direction to this extension. This object undergoes variable force in direction 'x'.

#### Why work done on the system is negative?

The negative sign associated with PV work done indicates that the system loses energy. If the volume increases at constant pressure (ΔV > 0), the work done by the system is negative, indicating that a system has lost energy by performing work on its surroundings.

#### Is gravity negative or positive?

The acceleration due to gravity is ALWAYS negative. Any object affected only by gravity (a projectile or an object in free fall) has an acceleration of -9.81 m/s2, regardless of the direction. The acceleration is negative when going up because the speed is decreasing.

#### Is work done by gravity always zero?

Gravity is a constant force. Hence, work by gravity is constant for a given displacement. The particle retains the kinetic energy on return to same vertical position. Work by gravity for horizontal displacement is zero as force and displacement are at right angle.

#### In which situation is no work done?

When the force makes an angle with the direction of force the component of force along the direction of displacement is taken. If the force is perpendicular to the direction of displacement, work done is zero. When the displacement opposite to the direction of force, work is negative.

#### What does it mean when the work is negative?

In the context of classical mechanics as you describe, negative work is performed by a force on an object roughly whenever the motion of the object is in the opposite direction as the force. Such a negative work indicates that the force is tending to slow the object down i.e. decrease its kinetic energy.

#### Why is the force of a spring negative?

You pull a spring to extend it. The force you exert on the spring is in the same direction as your displacement. You have done positive work on the spring. The force that the spring exerts on you is in the opposite direction to its displacement so the spring has done negative work.

#### Can work done be negative?

Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work.

#### What is 0 work done?

When force and displacement are perpendicular to each other, or when force or displacement is zero. Example: When we hold an object and walk, the force acts in a downward direction whereas displacement acts in the forward direction.

#### What is an example of negative work?

Negative work follows when the force has a component opposite or against the displacement. Negative work removes or dissipates energy from the system. Two examples: In pulling a box of books along a rough floor at constant velocity, I do positive work on the box, that is I put energy into the system.