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Force is an effect which can

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Measurement of force

Force is an effect which can

Start motion,
Stop motion,
Change the speed or direction of motion,
Change the shape or size of a body.

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The ability of a force to change the speed of an object is very useful: an engine increases the speed of a car, a parachute slows down a falling object and a jet engine pushes a plane forwards (Figure 2.2). Look at the pictures below. State which effect of a force is shown in each one?

Figure 2.2 The engines push up a plane forwards.

Measurement of force

Unit of force

Force is represented by the symbol ‘F’ and is measured in units called Newtons (N). The pull on a 100 g mass is about 1 N on earth.

Measuring force

A spring stretches when you pull it. The harder you pull, the more the spring stretches, as long as you do not keep pulling it until it breaks. A simple way to measure a force is by using it

to stretch a spring. A spring with a scale attached to it is called a spring balance or

dynamometer (or Newtonmeter). See the figure on the right.

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Орал қаласы 2018 жыл

Force is an effect which can

Force is an effect which can

Measurement of force

Measuring force