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Experiencing various forces
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Aim: • To observe the actions of various forces.
Apparatus and Materials:
top pan balance
a tennis ball
a wooden block
small pieces of torn papers
Van de Graaf generator and a pith ball suspended on string
coiled springs
a ping pong ball
2 bar magnets
plastic combs and dry chamois cloth
Procedures and Observations:
1. Using the top pan balance, weigh the tennis ball and ping pong ball. Record the two masses.
2. Holding the two balls at the same height from the ground, release both of them at the same time.
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Aim: • To make use of spring extension to measure forces.
Apparatus and Materials:
a 18-cm laboratory steel spring
standard slotted weights (up to 500g)
Scotch tape
thread
small lump of plasticise
a 30-cm rule with a hole at the upper end
a small wooden block (3 cm by 5 cm by 4 cm)
an optical pin
Procedures and Observations:
1. Using a retort stand, clamp a nail firmly so that the 30-cm rule can be hung on it as shown.
2. Hang the 18-cm steel spring in front of the ruler
on the nail. With the help of a small lump of plasticise or blue tag
attach an optical pin as a pointer to the lower end of the spring.
3. You are to construct a force meter out of this spring
using the standard slotted weights as reference. Note and record the
pointer reading against the ruler without any added weight in the table
below.
4. Now attach a 50 g mass to the lower end of the spring.
The spring will stretch under gravitational force. Note and record the
pointer reading in the table.
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