science
Grade8
Easy
Question
Which force is necessary to keep a body moving in a circular path?
- Gravitational force
- Centripetal force
- Contact force
- Muscular force
Hint:
Force acting towards the centre of the path of circular motion.
The correct answer is: Centripetal force
Here the correct option will be 'b' i.e; centripetal force. Whenever a body moves in a circular motion a net force towards the centre of the path acts upon the object. This is known as centripetal force and it always acts toward the centre of the path of motion. So whatever forces are acting on the object in circular motion net force will be centripetal.
Related Questions to study
science
A ball that is thrown up travels a certain distance upwards and falls back to the ground. The gravitational pull acts on it ______.
A ball that is thrown up travels a certain distance upwards and falls back to the ground. The gravitational pull acts on it ______.
scienceGrade8
Physics
A spherical uniform planet is rotating about its axis. The velocity of a point on its equator is v. Due to rotation of planet about its axis the acceleration due to gravity g at equator 
of g at poles. The escape velocity of a particle on the pole of planet in terms of 
:
A spherical uniform planet is rotating about its axis. The velocity of a point on its equator is v. Due to rotation of planet about its axis the acceleration due to gravity g at equator of g at poles. The escape velocity of a particle on the pole of planet in terms of :
PhysicsMechanics
Physics
Two satellites 
and 
are revolving around the earth in coplanar concentric orbits in the opposite sense. At t = 0, the positions of satellites are shown in the diagram. The period of and
are 4 h and 24 h, respectively. The radius of orbit of is 
. For this situation mark the correct statement(s)
Two satellites and are revolving around the earth in coplanar concentric orbits in the opposite sense. At t = 0, the positions of satellites are shown in the diagram. The period of and
are 4 h and 24 h, respectively. The radius of orbit of is . For this situation mark the correct statement(s)
PhysicsMechanics
Physics
A double star consists of two stars having masses M and 2M . The distance between their centres is equal to r . They revolve under their mutual gravitational interaction. Then, which of the following statements are not correct?
A double star consists of two stars having masses M and 2M . The distance between their centres is equal to r . They revolve under their mutual gravitational interaction. Then, which of the following statements are not correct?
PhysicsMechanics
Physics
A solid sphere of uniform density and radius 4 units is located with its centre at the origin O of coordinates. Two spheres of equal radii 1 unit, with their centres at A (-2,0,0) and B(2,0, 0) respectively, are taken out of the solid leaving behind spherical carvities as shown in the figure., Then
A solid sphere of uniform density and radius 4 units is located with its centre at the origin O of coordinates. Two spheres of equal radii 1 unit, with their centres at A (-2,0,0) and B(2,0, 0) respectively, are taken out of the solid leaving behind spherical carvities as shown in the figure., Then
PhysicsMechanics
Physics
A tunnel is dug along a chord of the earth at a perpendicular distance R / 2 from the earth's centre. The wall of the tunnel may be assumed to be frictionless. A particle is released from one end of the tunnel. The pressing force by the particle on the wall, and the acceleration of the particle vary with x (distance of the particle from the centre of earth ) according to
A tunnel is dug along a chord of the earth at a perpendicular distance R / 2 from the earth's centre. The wall of the tunnel may be assumed to be frictionless. A particle is released from one end of the tunnel. The pressing force by the particle on the wall, and the acceleration of the particle vary with x (distance of the particle from the centre of earth ) according to
PhysicsMechanics
Physics
Figure shows the kinetic energy 
and potential energy 
curves for a two-particle system. Name the point at which the system is bound.
Figure shows the kinetic energy and potential energy curves for a two-particle system. Name the point at which the system is bound.
PhysicsMechanics
Physics
A triple star system consists of two stars, each of mass m , in the same circular orbit about central star with mass
. The two outer stars always lie at opposite ends o fa diameter of their common circular orbit. The radius of the circular orbit is 
and the orbital period of each star is
The orbital velocity of each star is
A triple star system consists of two stars, each of mass m , in the same circular orbit about central star with mass . The two outer stars always lie at opposite ends o fa diameter of their common circular orbit. The radius of the circular orbit is and the orbital period of each star is
The orbital velocity of each star is
PhysicsMechanics
Physics
A triple star system consists of two stars, each of mass m , in the same circular orbit about central star with mass . The two outer stars always lie at opposite ends o fa diameter of their common circular orbit. The radius of the circular orbit is and the orbital period of each star is 
The mass m of the outer star is
A triple star system consists of two stars, each of mass m , in the same circular orbit about central star with mass . The two outer stars always lie at opposite ends o fa diameter of their common circular orbit. The radius of the circular orbit is and the orbital period of each star is
The mass m of the outer star is
PhysicsMechanics
Physics
In the graph shown, the PE of earth-satellite system is shown by solid line as a function of distance r (the separation between earth's centre and satellite). The total energy of the two objects which may or may not be bounded to earth are shown in figure by dotted lines
Based on the above information answer the following questions:
If object having total energy E1 having same PE curve as shown in figure, then
In the graph shown, the PE of earth-satellite system is shown by solid line as a function of distance r (the separation between earth's centre and satellite). The total energy of the two objects which may or may not be bounded to earth are shown in figure by dotted lines
Based on the above information answer the following questions:
If object having total energy E1 having same PE curve as shown in figure, then
PhysicsMechanics
Physics
In the graph shown, the PE of earth-satellite system is shown by solid line as a function of distance r (the separation between earth's centre and satellite). The total energy of the two objects which may or may not be bounded to earth are shown in figure by dotted lines.
Based on the above information answer the following questions:
Mark the correct statement
In the graph shown, the PE of earth-satellite system is shown by solid line as a function of distance r (the separation between earth's centre and satellite). The total energy of the two objects which may or may not be bounded to earth are shown in figure by dotted lines.
Based on the above information answer the following questions:
Mark the correct statement
PhysicsMechanics
Physics
A solid sphere of mass m radius r is placed inside a hollow thin spherical shell of mass M and radius R as shown in figure. A particle of mass m’ placed on the line joining the two centres at a distance x from the point of contact of the sphere and the shell. Find the magnitude of the resultant gravitational force on this particle due to the sphere and the shell if
A solid sphere of mass m radius r is placed inside a hollow thin spherical shell of mass M and radius R as shown in figure. A particle of mass m’ placed on the line joining the two centres at a distance x from the point of contact of the sphere and the shell. Find the magnitude of the resultant gravitational force on this particle due to the sphere and the shell if
PhysicsMechanics
Physics
A solid sphere of mass m radius r is placed inside a hollow thin spherical shell of mass M and radius R as shown in figure. A particle of mass m’ placed on the line joining the two centres at a distance x from the point of contact of the sphere and the shell. Find the magnitude of the resultant gravitational force on this particle due to the sphere and the shell if
A solid sphere of mass m radius r is placed inside a hollow thin spherical shell of mass M and radius R as shown in figure. A particle of mass m’ placed on the line joining the two centres at a distance x from the point of contact of the sphere and the shell. Find the magnitude of the resultant gravitational force on this particle due to the sphere and the shell if
PhysicsMechanics
Physics
The gravitational field due to a mass distribution is given by E . K I x3 in x — direction. Taking the 
in x- gravitational potential to be zero at infinity, its value at distance x is:
The gravitational field due to a mass distribution is given by E . K I x3 in x — direction. Taking the in x- gravitational potential to be zero at infinity, its value at distance x is:
PhysicsMechanics
Physics
A point p lies on the axis of a fixed ring of mass and radius R, at a distance 2R from its centre O. A small particle starts from p and reaches O under gravitational attraction only. Its speed at O will be:
A point p lies on the axis of a fixed ring of mass and radius R, at a distance 2R from its centre O. A small particle starts from p and reaches O under gravitational attraction only. Its speed at O will be:
PhysicsMechanics
