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Introduction to force
Task 3.3 7. There are four fundamental forces,
namely:
1. Discuss the four types of contact (a) gravitational force;
forces and the properties of each type. (b) electromagnetic force;
State their uses in everyday life. (c) the strong force; and
2. Hang two balloons on a wall side by (d) the weak force.
side and allow them to touch each 8. Forces produce several effects
other. Rub each one of them with a when in action. These include
dry cloth. What happens? Explain. stretching, compressing, bending
3. Place a bar magnet on a smooth table and rotating or turning.
and then bring another bar magnet 9. Friction is a resistance force that
near it. What happens? Explain. an object encounters when resting
4. Starting with two bar magnets parallel or moving over another object.
to each other, rotate one bar magnet 10. A compressional force is the force
by 90° and bring it near the fi rst which when applied to an object
magnet. What happens? Explain. result in a decrease of its size.
Revision exercise 3
Chapter summary
1. A force is a push or pull experienced Section A
by an object. It results from the 1. Choose the most correct answer
interaction between two objects.
2. Forces can cause a change in the: (i) A force acting on an object causes
some properties of the object to
(a) speed or direction of an change. Which of the list contains
object’s motion; properties that can be changed by
(b) shape and size of an object; the action of force?
and
(c) way an object moves. (a) Mass, motion, and shape
3. Some forces act through physical (b) Mass, motion and size
(c) Mass, shape, and size
contact between two objects while
others act at a distance. (d) Motion, shape and size
4. Force is measured in newtons (N). (ii) Figure 3.20 (a) and (b) represents
5. A spring balance can be used to the beam balance and the spring
measure various forces, including respectively. A beaker in the right
weight. side balances the standard masses
6. Weight is a measure of the in the left side as shown in Figure
gravitational force exerted on an 3.20 (a). The beaker is then removed
object. and hung from a spring as shown in
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