EASY
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Force is a scalar quantity. State whether the given sentence is true or false.

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Important Questions on Mechanics

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A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. Force P is applied at one end of the rope. The force which the rope exerts on the block is

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Which of the following is the correct order of forces?
HARD
The force exerted by the floor of an elevator on a standing person's foot is more than the weight of the person. This situation occurs if the elevator is
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A body of mass 8 kg is suspended through two light springs X and Y connected in series as shown in figure. The readings of X and Y are:

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MEDIUM
Choose appropriate free body diagram for the particle experiencing net acceleration along negative y direction. (Each arrow mark represents the force acting on the system).
MEDIUM

A uniform sphere of weight w and radius 3 m is being held by a string of length 2 m, attached to a frictionless wall, as shown in the figure. The tension in the string will be:

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MEDIUM
A man weighing 60 kg is in a lift moving down with an acceleration of 1.8 m s-2. The force exerted by the floor on him is
MEDIUM
Mark the correct statements.
EASY

Two solid spheres of same metal but of mass 8M and 27M fall simultaneously on a viscous liquid and their terminal velocities are v and nv, then the value of n is

HARD
If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator maybe
EASY
A spring of force constant K is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of
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A body of the mass 50 kg is suspended using a spring balance inside a lift at rest. If the lift starts falling freely, the reading of the spring balance is
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A massless spring balance is attached to 2 kg trolley and is used to pull the trolley along a flat surface as shown in the figure. The reading on the spring balance remains at 10 kg during the motion. The acceleration of the trolley is: g=9.8  m s-2

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EASY
The S.I unit of force is
EASY
A proton exerts a force on a proton which is
HARD
The length of an elastic spring is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the spring (in metre) when the longitudinal tension is 9 N is
EASY
1 N =_____ dyne.
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The two ends of a spring are displaced along the length of the spring. All displacements have equal magnitudes. In which case or cases, the tension or compression in the spring will have a maximum magnitude?
MEDIUM

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. Force P is applied at one end of the rope. The force which the rope exerts on the block is

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MEDIUM
A man weighing 60 kg is in a lift moving down with an acceleration of 1.8 m s-2. The force exerted by the floor on him is