Turning effect of force - class-X
Description: turning effect of force | |
Number of Questions: 28 | |
Created by: Gagan Singh | |
Tags: motion of system of particles and rigid bodies forces - vectors and moments physics systems of particles and rotational motion turning on a pivot turning effects of forces force |
While opening a tap with two fingers, the forces applied are
On applying a constant torque on a body-
_____ is applied to unwind a screw.
It becomes easier to open or close a door turning about its hinges if the force is applied at the:
Which of the following playground equipment make use of the turning effect of forces?
The spanner with a longer handle can tighten nuts and bolts with less effort.
Self balancing toys have curved and heavy base area.
Which of the following sports uses the turning effect of forces?
For a rigit body, we know that if verious forces act at various points in it , the resultant motion is as if a net force acts on the CM(centre of mass) causing translation and a net torque at the CM causing rotation around an axis through the CM. for the earth-sun system (approximating the earth as a uniform density sphere).
The angular momentum of body remains conserve if:
A body is acted upon by two forces each of magnitude $F$, but in opposite directions. State the effect of the forces if the two forces act at two different points of the body at a separation $r$. Which of the following is/are true?
Consider a cylindrical shaft of length $\lambda$ and radius $R$. It is twisted by torque r. If shear modulus of material is $S$, then angle of twist should be.
A body is acted upon by two unequal forces in opposite directions, but not in same line. The effect is that:
A uniform meter rule is pivoted at its mid-point. A weight of $50gf$ suspended at one end of it. Where should a weight of $100 gf$ be suspended to keep the rule horizontal :
A body is acted upon by two forces each of magnitude $F$, but in opposite directions. State the effect of the forces if both forces act at the same point of the body. Which of the following is/are true?
Name the factor on which moment of inertia of a body depends .
A uniform metre rule of mass $100g$ is balanced on a fulcrum at mark $40cm$ by suspending an unknown mass $m$ at the mark $20cm$ . To which side the rule will tilt if the mass $m$ is moved to the mark $10cm$?
Which of the following playground equipment make use of the turning effect of forces?
A small piece of space junk is at rest in outer space. A very small asteroid strikes it, exerting a force on it that is NOT directed through the piece of space junk's center of mass.
Which of the following describes the motion of the piece of space junk DURING the asteroid strike?
A body is under the action of two equal and oppositely directed forces and the body is rotating with constant non-zero angular acceleration. Which of the following cannot be the separation between the lines of action of the forces?
If principle of moments for any object holds, then object is in state of
A uniform dice of mass $10kg$ radius $1m$ is placed on a rought horizontal surface. The coefficient of friction between the disc and the surface is $0.2$. A horizontal time varying force is applied on the centre of the disc whose variation with time is shown in graph.
List-I List-IIDisc rolls without slipping at $t=7s$Disc rolls with slipping at $t=3s$ Disc starts slipping at at $t=4s$Friction force is $10N$ at None
When slightly different weights are placed on the two pans of a beam balance, the beam comes to rest at an angle with the horizontal. The beam is supported at a single point P by a pivot. Then which of the following statement(s) is/are true ?
When a ceiling fan is switched off, its angular velocity reduces by $50$% while it makes $36$ rotations. How many more rotations will it make before coming to rest? (Assume uniforms angular retardation)
The minimum value of ${ \omega } _{ 0 }$ below which the ring will drop down is
a flywheel is in the form of a solid circular wheel of mass 72 kg and radius 50cm and it makes 70 r.p.m. then the energy of revolution is:
Two discs having masses in the ratio $1:2$ and radii in the ratio $1:8$ roll down without slipping one by one from an inclined plane of height $h$. The ratio of their linear velocities on reaching the ground is