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Class 8 Science Study Material

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Force And Pressure

The ratio of force acting perpendicularly on an area to the magnitude of area, gives the

a) Pressure.
b) Force.
c) Volume.
d) Density.

✔Answer

✔Solution

Correct Answer Is : Pressure.

Solution Is : Pressure is the force per unit area applied in a direction perpendicular to the surface of an object.

Force should be applied on a scale placed between two bricks by putting the weight

a) At the corner of the scale.
b) At the centre of the scale.
c) Near the first brick.
d) Near the second brick.

✔Answer

✔Solution

Correct Answer Is : At the centre of the scale.

Solution Is : When the scale is placed between two bricks, force should be applied by putting weight at the centre of the scale. In this position, the force is maximum and can change the shape of the scale, by bending it downwards.

Astronauts wear special suits while floating in space due to

a) Presence of atmospheric pressure.
b) Absence of atmospheric pressure.
c) Presence of gravitational force.
d) Absence of gravitational force.

✔Answer

✔Solution

Correct Answer Is : Absence of atmospheric pressure.

Solution Is : Space has no atmosphere and so, the bodies of the astronauts can burst due to the internal pressure of the oxygen in the blood. Thus, special suits are designed so that they balance the internal pressure of the bodies of the astronauts with the non-existence of the external atmospheric pressure.

Frictional force acts in the direction

a) Of applied force.
b) Of the motion.
c) Opposite to the direction of motion.
d) Perpendicular to the motion.

✔Answer

✔Solution

Correct Answer Is : Opposite to the direction of motion.

Solution Is : When there is relative motion between two surfaces, there is always a resistance to the motion. This is the force of friction. Thus, friction always has its direction opposite to the direction of motion.

In a tug-of-war, when two teams pull equally hard, the rope

a) Moves towards the first team.
b) Moves towards the second team.
c) Remains stationary.
d) Breaks.

✔Answer

✔Solution

Correct Answer Is : Remains stationary.

Solution Is : If two forces act in the opposite direction on an object, the net force acting on it is the difference between the two forces. In this case, the net force is zero as the magnitude of the two forces which are acting in opposite direction are equal. As a result, the rope remains stationary.

A minus sign of force implies that the

a) Force is exerted on some other object.
b) Force is in opposite direction to that of the motion.
c) Force is in the same direction to that of the motion.
d) Gravitational force is acting on the object.

✔Answer

✔Solution

Correct Answer Is : Force is in opposite direction to that of the motion.

Solution Is : Force is a vector quantity, i.e., it has both magnitude as well as direction. When force is applied on a body and it is displaced in the opposite direction to that of the force, then it is said that the motion takes place in the opposite direction to the applied force.

The S.I. unit of force is

a) Newton.
b) Dyne.
c) Kg-wt.
d) Kg.

✔Answer

✔Solution

Correct Answer Is : Newton.

Solution Is : The S.I. unit of force is Newton, which is the force capable of accelerating a mass of one kg at the rate of one meter per second squared.

Gravitational force acts between

a) The sun and the planets only.
b) The earth and the moon only.
c) The various bodies in the universe.
d) The sun and the earth only.

✔Answer

✔Solution

Correct Answer Is : The various bodies in the universe.

Solution Is : The force with which a body(having mass) attracts another body(having mass) is called force of gravity. Thus, gravitational force acts between every object, which is found in the universe.

The relation between mass and force in S.I. unit is

a) 1 N = 1 kgf.
b) 1 N = 9.8 kgf.
c) 9.8 N = 1 kgf.
d) 9.8 N = 9.8 kgf.

✔Answer

✔Solution

Correct Answer Is : 9.8 N = 1 kgf.

Solution Is : The kilogram-force (kgf) is the force due to gravity on one kilogram of mass. Acceleration due to gravity = 9.8 metre per second squared. Force = mass x acceleration due to gravity = (1 x 9.8) Newton = 1 kgf.

The force which cannot

a) Magnetic force.
b) Electrostatic force.
c) Gravitational force.
d) Frictional force.

✔Answer

✔Solution

Correct Answer Is : Frictional force.

Solution Is : Magnetic, electrostatic and gravitational force are examples of non-contact forces which can act from a distance but frictional force is an example of contact force which acts between two bodies, only when they come in contact with each other.?

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Class 8 Science Study Material

Force And Pressure

The ratio of force acting perpendicularly on an area to the magnitude of area, gives the

Correct Answer Is : Pressure.

Solution Is : Pressure is the force per unit area applied in a direction perpendicular to the surface of an object.

Force should be applied on a scale placed between two bricks by putting the weight

Correct Answer Is : At the centre of the scale.

Solution Is : When the scale is placed between two bricks, force should be applied by putting weight at the centre of the scale. In this position, the force is maximum and can change the shape of the scale, by bending it downwards.

Astronauts wear special suits while floating in space due to

Correct Answer Is : Absence of atmospheric pressure.

Frictional force acts in the direction

Correct Answer Is : Opposite to the direction of motion.

Solution Is : When there is relative motion between two surfaces, there is always a resistance to the motion. This is the force of friction. Thus, friction always has its direction opposite to the direction of motion.

In a tug-of-war, when two teams pull equally hard, the rope

Correct Answer Is : Remains stationary.

A minus sign of force implies that the

Correct Answer Is : Force is in opposite direction to that of the motion.

Solution Is : Force is a vector quantity, i.e., it has both magnitude as well as direction. When force is applied on a body and it is displaced in the opposite direction to that of the force, then it is said that the motion takes place in the opposite direction to the applied force.

The S.I. unit of force is

Correct Answer Is : Newton.

Solution Is : The S.I. unit of force is Newton, which is the force capable of accelerating a mass of one kg at the rate of one meter per second squared.

Gravitational force acts between

Correct Answer Is : The various bodies in the universe.

Solution Is : The force with which a body(having mass) attracts another body(having mass) is called force of gravity. Thus, gravitational force acts between every object, which is found in the universe.

The relation between mass and force in S.I. unit is

Correct Answer Is : 9.8 N = 1 kgf.

Solution Is : The kilogram-force (kgf) is the force due to gravity on one kilogram of mass. Acceleration due to gravity = 9.8 metre per second squared. Force = mass x acceleration due to gravity = (1 x 9.8) Newton = 1 kgf.

The force which cannot

Correct Answer Is : Frictional force.

Solution Is : Magnetic, electrostatic and gravitational force are examples of non-contact forces which can act from a distance but frictional force is an example of contact force which acts between two bodies, only when they come in contact with each other.?

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