Studying the effect of intensity of exercise on fatigue

Equipment

stopwatch

Method

1. Perform some dynamic warm-up exercises on your non-dominant hand ('hand') to reduce the risk of muscle strain
2. Stretch your hand into the air above your head so that your arm is fully extended
3. Clench and unclench your hand at a frequency of one clench every two seconds
4. Record the time it takes for your hand to become completely fatigued - this is the point where it is too painful to continue
5. Rest the hand for two minutes
6. Repeat steps 2-5 but each time increase the frequency of clenching from one clench every two seconds to five clenches every two seconds in intervals of one clench every two seconds
7. Rest the hand for five minutes but each minute perform some static warm-down stretches on the hand
8. Repeat the entire process, steps 1-7, another two times to enable an average to be calculated
9. Perform some static warm-down stretches on the hand

Safety

The subject may develop muscle strain, so it is important that the warm-up and warm-down procedure is followed.

There are no other significant risks.

LDR response to variations in light intensity

Equipment

LDR
Multimeter
Connecting leads
Crocodile clips
Desk lamp
Metre rule
Blu-Tak

Method

1. Connect the LDR to the multimeter using crocodile clips and connecting leads.
2. Set the multimeter to read ohms.
3. Set the LDR up so it is 10 cm from the lamp. Ensure the lamp and the ruler are fixed in place to reduce errors in measuring distance.
4. Switch on the lamp and use the multimeter to record the resistance of the LDR. Switch off the lamp, then back on and repeat the readings. Repeat once more. Take a mean average of the three readings.
5. Increase the distance from the lamp to the LDR by 5 cm and repeat step 3.
6. Repeat step 4 until the LDR is 40 cm from the lamp.

Safety

The bulb being used may get hot.
The bulb is made of glass which may break.