Advertisements
Advertisements
Question
State the effects that a force can produce. Given one example of each.
Advertisements
Solution
A force can produce the following three effects:
(i) It can bring changes in dimensions. For example, in stretching a spring its length increases.
(ii) It can start or stop motion. For example, a ball moves when kicked.
(iii) It can change the speed or direction of motion. For example, a hockey player changes the speed and direction of the motion of the ball by his stick.
RELATED QUESTIONS
A half metre rod is pivoted at the centre with two weights of 20gf and 12gf suspended at a perpendicular distance of 6 cm and 10 cm from the pivot respectively as shown below.

1) Which of the two forces acting on the rigid rod causes clockwise moment?
2) Is the rod in equilibrium?
3) The direction of 20 kgf force is reversed. What is the magnitude of the resultant moment of the forces on the rod?
A wheel of diameter 2 m can be rotated about an axis passing through its center by a moment of force equal to 2.0 Nm. What minimum force must be applied on its rim?
What are non-contact forces? Give two example
Classify the following amongst contact and non-contact force.
force of tension in a string
Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of the resultant moment of forces about the pivot O.

A uniform metre rule of weight 10gf is pivoted at its 0 mark.
What moment of force depresses the rule?
Define the moment of force.
One joule is the amount of work done when a force of ......... moves a body through a distance of .......
A jack screw is provided with a long arm. Explain why?
How does the distance of separation between two bodies affect the magnitude of the non-contact force between them?
