S K Jain and Shailesh K Jain Solutions for Chapter: Force and Pressure, Exercise 5: Exercises

Since the pressure is dependent on the area over which the force is acting, the pressure can be increased and decreased without any change in the force. The force applied is to be constant if the surface becomes smaller and the pressure increases and vice-versa.

In other words, if the surface becomes smaller, the pressure becomes larger. It is for this reason that the knives and nails are so sharp. The sharper the edge, the higher the pressure, consequently cutting with a sharp knife is easy and whereas with a blunt more force is required to cut.

For the same reason, an expertly delivered karate chop is much more damaging and deadly than an open-handed slap. When you slap someone, the force you apply in slapping the surface is distributed all over the palm of your hand. In contrast, a karate chop concentrates all the force on the sides of your face hand which have significantly lesser surface area than your palms. This leads to a great application of pressure on the surface thereby rendering a karate chop deadlier than a slap.

Read the paragraph and answer the following question:

Since the pressure is dependent on the area over which the force is acting, the pressure can be increased and decreased without any change in the force. The force applied is to be constant if the surface becomes smaller and the pressure increases and vice-versa.

In other words, if the surface becomes smaller, the pressure becomes larger. It is for this reason that the knives and nails are so sharp. The sharper the edge, the higher the pressure, consequently cutting with a sharp knife is easy and whereas with a blunt more force is required to cut.

For the same reason, an expertly delivered karate chop is much more damaging and deadly than an open-handed slap. When you slap someone, the force you apply in slapping the surface is distributed all over the palm of your hand. In contrast, a karate chop concentrates all the force on the sides of your face hand which have significantly lesser surface area than your palms. This leads to a great application of pressure on the surface thereby rendering a karate chop deadlier than a slap.

Read the paragraph and answer the following question:

Since the pressure is dependent on the area over which the force is acting, the pressure can be increased and decreased without any change in the force. The force applied is to be constant if the surface becomes smaller and the pressure increases and vice-versa.

In other words, if the surface becomes smaller, the pressure becomes larger. It is for this reason that the knives and nails are so sharp. The sharper the edge, the higher the pressure, consequently cutting with a sharp knife is easy and whereas with a blunt more force is required to cut.

For the same reason, an expertly delivered karate chop is much more damaging and deadly than an open-handed slap. When you slap someone, the force you apply in slapping the surface is distributed all over the palm of your hand. In contrast, a karate chop concentrates all the force on the sides of your face hand which have significantly lesser surface area than your palms. This leads to a great application of pressure on the surface thereby rendering a karate chop deadlier than a slap.

Read the paragraph and answer the following question:

When two or more forces act simultaneously on a body in the same or different direction then the overall effect of these forces on the body is known as the resultant force. In other words, the resultant force is that force that would produce the same effect on the body as that produced by several forces acting simultaneously on the same body. When the resultant of several forces acting simultaneously on an object is non-zero, then the forces are said to be unbalanced forces. An unbalanced force can change the state of rest, state of uniform motion, speed or direction of a body. When the resultant of several forces acting simultaneously on an object is zero, then the forces are said to be balanced forces. For example, in the game of tug of war, when both teams exert equal force on the rope in opposite directions, the rope does not move at all. This is because, forces of equal magnitude, acting in opposite directions, cancel each other's effect. Hence, the forces are balanced forces.

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The single force that acts on a body to produce the same effect in it as produced by all the forces collectively is called the

When two or more forces act simultaneously on a body in the same or different direction then the overall effect of these forces on the body is known as the resultant force. In other words, the resultant force is that force that would produce the same effect on the body as that produced by several forces acting simultaneously on the same body. When the resultant of several forces acting simultaneously on an object is non-zero, then the forces are said to be unbalanced forces. An unbalanced force can change the state of rest, state of uniform motion, speed or direction of a body. When the resultant of several forces acting simultaneously on an object is zero, then the forces are said to be balanced forces. For example, in the game of tug of war, when both teams exert equal force on the rope in opposite directions, the rope does not move at all. This is because, forces of equal magnitude, acting in opposite directions, cancel each other's effect. Hence, the forces are balanced forces.

Read the paragraph carefully and answer the following question:

When two or more forces act simultaneously on a body in the same or different direction then the overall effect of these forces on the body is known as the resultant force. In other words, the resultant force is that force that would produce the same effect on the body as that produced by several forces acting simultaneously on the same body. When the resultant of several forces acting simultaneously on an object is non-zero, then the forces are said to be unbalanced forces. An unbalanced force can change the state of rest, state of uniform motion, speed or direction of a body. When the resultant of several forces acting simultaneously on an object is zero, then the forces are said to be balanced forces. For example, in the game of tug of war, when both teams exert equal force on the rope in opposite directions, the rope does not move at all. This is because, forces of equal magnitude, acting in opposite directions, cancel each other's effect. Hence, the forces are balanced forces.

Read the paragraph carefully and answer the following question:

When two or more forces act simultaneously on a body in the same or different direction then the overall effect of these forces on the body is known as the resultant force. In other words, the resultant force is that force that would produce the same effect on the body as that produced by several forces acting simultaneously on the same body. When the resultant of several forces acting simultaneously on an object is non-zero, then the forces are said to be unbalanced forces. An unbalanced force can change the state of rest, state of uniform motion, speed or direction of a body. When the resultant of several forces acting simultaneously on an object is zero, then the forces are said to be balanced forces. For example, in the game of tug of war, when both teams exert equal force on the rope in opposite directions, the rope does not move at all. This is because, forces of equal magnitude, acting in opposite directions, cancel each other's effect. Hence, the forces are balanced forces.

Read the paragraph carefully and answer the following question:

In the given figure, if ${\mathrm{F}}_1=10 \mathrm{N}$ and ${\mathrm{F}}_2=15 \mathrm{N}$, then the resultant force is equal to 

When two or more forces act simultaneously on a body in the same or different direction then the overall effect of these forces on the body is known as the resultant force. In other words, the resultant force is that force that would produce the same effect on the body as that produced by several forces acting simultaneously on the same body. When the resultant of several forces acting simultaneously on an object is non-zero, then the forces are said to be unbalanced forces. An unbalanced force can change the state of rest, state of uniform motion, speed or direction of a body. When the resultant of several forces acting simultaneously on an object is zero, then the forces are said to be balanced forces. For example, in the game of tug of war, when both teams exert equal force on the rope in opposite directions, the rope does not move at all. This is because, forces of equal magnitude, acting in opposite directions, cancel each other's effect. Hence, the forces are balanced forces.

Read the paragraph carefully and answer the following question: