4) A force is that which alters or has tendency to adjust the state of rest or motion of a body. 


For simplicity sake, all pressures (interactions) between objects can be placed into two wide categories: call forces, and forces result from action-at-a-distance.

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Contact Forces include: friction forces, buoyant forces, common forces, and also air resistance forces 

Action-at-a-distance forces include: gravitation, electrostatic and magnetic forces.

Measuring Force:

Force is measured making use of either the English system of measurements or the International device of systems (SI).

Common systems of Force

--->>SI: Newton (N) 1 N = 0.225 lb; 

One Newton (N) of pressure is characterized as the lot of force needed to advice 1 kilogram (kg) of mass in ~ a rate of 1 meter per second squared (m/s2).

1 Newton = 1 kg m/sec2 (A kilogram is the amount of weight at which 1 N of force will accelerate at a rate of 1 m/s2.)

--->>English System: pound (LB) 1 LB = 4.448 N 

In English device of measurements, a cheese is the amount of mass the 1 pound of force will advice at 1 ft/s2, and a pound mass is the lot of mass that 1 LB of force will accelerate at 32 feet/s2. 

Describing a Force:

A pressure is a vector quantity. A vector amount is a quantity which has actually both magnitude and direction. To completely describe the pressure acting upon an object, friend must define both that magnitude and direction. Thus, 10 Newtons of pressure is not a finish description that the pressure acting on an object. 10 Newtons, downwards is a finish description that the force acting top top an object. 

(Note: What is the difference between vector and also scalar quantities? A vector has both strength and direction, a scalar quantity have the right to be described using just 1 quantity, magnitude. Examples of scalar quantities are: time, energy and volume because they just represent magnitude and also no direction.

What is the Difference in between Mass and also Weight?

Shown listed below are two varieties of scales frequently used in the classroom --a spring range (left) and also a an easy balance beam scale on the right.

On planet the spring range reads 100g v an unknown massive attached in ~ the bottom. To balance the scale on the appropriate a 100g fixed was also needed.

If we were to take both scale to the moon, what would the the spring scale read? how much mass would be essential to balance the 100g fixed on the balance beam? have the right to you define your answer? For much more details watch the Mass and Weight Page.



What does applying a pressure do?

Force causes acceleration. 

Newton\"s second Law claims that: the acceleration (a) of things is straight proportional to the force (F) applied, and also inversely proportional come the object\"s fixed (m).

That way that the an ext force you apply to an object, the better the acceleration. And, the much more mass the object has, the lower the acceleration. 

Newton\"s 2nd Law have the right to be written in equation form: F = ma. 

For fall objects we deserve to write F=mg whereby g is the acceleration due to gravity. The pressure of heaviness is what causes free falling objects come accelerate. This objects all accelerate in ~ the same price of 9.8 meters/sec^2

What is Friction?

Friction is the pressure that opposes the relative movement or propensity to such activity of 2 bodies in contact. If we try to push a block of wood throughout a table, there room two opposing pressures that act: the force associated with the push, and a pressure that is connected with the friction which action in the opposite direction. As frictional pressures are lessened (for example, by put oil ~ above the table) the object move further and further prior to stopping. This demonstrates Galileo\"s regulation of inertia i m sorry states: an object in a state of motion possesses one ``inertia\"\" that reasons it to remain in that state of activity unless an exterior force acts on it.

Try this exercise!

Please go into your prize in the room provided:

1) How much net pressure is compelled to advice a 1500 kg auto at 6.00 m/s2? 

Please go into your answer in the room provided: 

2) What is the mass of an object that has actually a weight of 115 N on the Moon? The gravity of the Moon is 1/6 that g (which is 9.8 m/s2). 

2. Which of the adhering to are action at a distance forces? a) wait resistance b) normal forces c) magnetic pressures d) friction forces

3. What is the force that opposes the relative activity or propensity to such activity of two bodies in contact a) magnetism b) the normal pressure c) heaviness d) friction

4. 1 kg-m/sec/sec is same to-- a) 1 Newton b) 1 lb c) 1000 newtons d) none of the above

5. I m sorry of the following statements is not correct a) wait resistance is a force b) mass is the an outcome of the force of heaviness c) to accelerate an object requires a pressure d) weight is the force of heaviness

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