اعداد الطالب / محمد نهيل محمد العثماني رقم جامعي / 120090151 101

1. اعداد الطالب / محمد نهيل محمد العثماني • رقم جامعي / 120090151 • 101

2. OBJECT: HOOK'S LAW Performance objective : After this lab you will be able to ; To verify the hook's law To find the gravitational acceleration g . You will be able to understand motion in the spring. • Equipments : • Spring , Note . • Slotted mass ( weight ). • Scalar ( Ruler ) Discussion : In mechanics, and physics, Hooke's law of elasticity is an approximation that states that the extension of a spring is in direct proportion with the load added to it as long as this load does not exceed the elastic limit. Materials for which Hooke's law is a useful approximation are known as linear-elastic or "Hookean" materials.

3. Mathematically, Hooke's law states that where x is the displacement of the end of the spring from its equilibrium position; F is the restoring force exerted by the material; and k is the force constant (or spring constant).

4. Procedures or steps: Select a spring from those provide. Suspend three different masses or combinations of masses from the end of the spring and measure the distance that it stretches. It is not important how you measure the stretch as long as you consistently apply your method. The masses must be sufficient to stretch the spring at least a few centimeters, but not able to damage the spring. Calculate the weights of the hanging masses (F = mg). Be sure to use SI units (kg and newtons). Save and label this spring for later use. To calculate T we pull the spring down and calculate the time in 20 cycles. Plot the results using table and record

6. Calculations : F = m.g F = k.l F = m.a = k.x Slope = m = ∆y/∆x = ∆T²/∆m Slope = (0.168-0.122)/(500-200) Slope = 0.046/300 Slope = 0.0001533

7. Remark: these's result may not accurate because there is some kind of shortage in tools which we use it.