Force and Pressure on a Rigid Body

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Questions and Answers

What is the effect of pressure on a stationary rigid body?

It changes the shape of the body

It does not affect the body

It changes the size of the body

It changes both the size and shape of the body (correct)

What type of force is applied to an object when a liquid is poured on it?

Pressure (correct)

Tension

Friction

Torsion

What is the direction of the force exerted by the Earth on an object?

Parallel to the surface

In a straight line towards the center of the Earth (correct)

At an angle to the surface

Perpendicular to the surface

What is the unit of measurement for pressure?

N/m^2 Signup and view all the answers

What is calculated when pressure is applied to a surface?

Force per unit area Signup and view all the answers

What is the effect of a liquid on a surface?

It increases the pressure on the surface Signup and view all the answers

What is the shape of the line of force exerted by the Earth on an object?

Straight Signup and view all the answers

What is the factor that determines the pressure exerted by a liquid?

Density of the liquid Signup and view all the answers

What is the result of a force applied in the direction of motion of a moving body?

It increases its speed Signup and view all the answers

What is the unit of pressure?

N/m² Signup and view all the answers

What is the definition of pressure?

Force applied per unit area Signup and view all the answers

What happens when a force is applied to a body which is not free to move?

It increases its pressure Signup and view all the answers

What is the effect of a force applied as stretch or compression on a moving body?

It increases its speed Signup and view all the answers

How much does the speed of a body change when a force is applied to it for one second?

By 1 m in one second Signup and view all the answers

What is the unit of moment of force in S.I. system?

N m Signup and view all the answers

Why does the body not sink much into the sand when a force is applied?

Due to the pressure exerted by the body Signup and view all the answers

What is the unit of force in C.G.S. system?

dyne Signup and view all the answers

What is the effect of pressure mentioned in the text?

More pressure means less penetration Signup and view all the answers

What is the relationship between the thrust exerted and the pressure applied?

Thrust is directly proportional to pressure Signup and view all the answers

What is the unit of pressure in the given context?

kgf/cm^2 Signup and view all the answers

Why is the effect of pressure the same in both cases mentioned in the text?

Because the pressure is the same Signup and view all the answers

What is the quantity that is being referred to as 'pressure' in the text?

Force per unit area Signup and view all the answers

Study Notes

Pressure and Force

When a force is applied to a stationary rigid body, it starts to squeeze or change the size or shape of the body.
Pressure is a quantity that is expressed in terms of force per unit area.
The unit of pressure in the S.I. system is kgf/m², and in the C.G.S. system, it is gf/cm².

Force and Motion

When a force is applied to a moving body of mass 1 kg, it increases its speed by 1 m in one second.
A force can be applied in the direction of motion, which increases the speed of the body.

Pressure in Real-Life Situations

When you stand on sand, your body does not sink much into the sand because the thrust exerted on the sand is spread out over a larger area, resulting in a lower pressure.
The pressure exerted on the sand is the same in both cases, but the effect of the pressure is different due to the difference in the area over which it is applied.