FORM 2 PHYSICS

ONLINE TEST SERIES

HOOKES LAW

1. The diagram shows how the length of a spring changes when a load of 10 N is hung on it
2. The 10 N load is replaced by a 20 N load. What is the new length of the spring?

1. A spring balance is calibrated to give readings in newtons. The graph shows how the extension of the spring varies with the load.

A load causes the spring of the balance to extend by 3 cm.

1. A student adds weights to an elastic cord. He measures the length of the cord for each weight. He then plots a graph from the results, as shown below..

Which length has he plotted on the vertical axis?

4. An extension-load graph for a wire is shown

What is the load at the limit of proportionality for the wire?

1. A 100 g mass is suspended from a spring next to a vertical metre rule. The top of the spring is level with the 0.0 cm mark. The bottom of the spring is level with the 27.2 cm mark.

The 100 g mass is replaced with a 600 g mass. The length of the spring is now 89.7 cm. The spring has not reached the limit of proportionality.The 600 g mass is replaced with a 200 g mass. What is the length of the spring?

 6 Which formula correctly states the relationship between force and extension?

 7 If a material has a spring constant of 10N/m and is extended by 1m, what force must have been applied to the object?

 8 What is the size of the extension of an object which has a spring constant of 30N/m when a force of 15N is applied?

 9 A slinky is stretched from being a length of 15cm to a length of 2m. One end of the slinky is affixed to a point whilst a child pulls on the other end with a force of 10N. What is the spring constant of the slinky?

 10 An spring is stretched to a point where, when released it does not return to its original length. What is this point called?

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