Vocabulary

distributed forces розподілені сили

concurrent одночасний, співпадаючий

coplanar в одній площині

determine визначати

net torque корисний момент

Test

1. Match the titles to the parts of the text:

1). Pressure.

2). A body in equilibrium.

3). A force, its magnitude, direction and place of application.

4). A rigid body.

5). The resultant of acting of two concurrent forces.

A	B	C	D	E

2. Match the notions to their definitions:

1. Pressure	a) Quantity of work done in a minute af time
2. Work	b) The capacity of a system or body for doing work
3. Energy	c) Moving some object by force through a distance
4. Power	d) The force per unit area.

1	2	3	4

3. What statements are true or false:

1). Static Friction The resistance to motion between two bodies in contact with each other but at rest.

2). An action of one body upon another which changes or tends to change the rate or direction or speed of bodies is called power.

3). A force has magnitude, direction, and place of application.

4). The process of determining the resultant is called composition.

5). Calling a body rigid means that the changes in the dimensions of the body are big enough to be neglected.

6). Statics is the study of bodies and structures that are in equilibrium.

1	2	3	4	5	6

4. Choose the right statement:

1).The resultant of a system of forces is equivalent to…

a)time and length;

b)that system;

c)power.

2). The body's own tendency is to restore…

a) the deformation;

b) the weight;

c) the rorce.

3). Pressure acts equally…

a) in the depth;

b) on the area;

c) in all directions.

5. Fill in the gaps.

Pressure (1) as the force per unit area. Pressure (2) equally in all directions. The pressure on the body immersed in liquid is due to the weight of a liquid and (3)may be calculated easily for any depth. Pressure 10∙1 or 10 tons is the force with which the one-square-metre column estabishes on the bottom of the tank and is, therefore, the pressure in tons per square metre.

1) a)was defined; b) is defined; c)has been defined;

2) a)is acting; b) were acting; c) acts;

3) a) may be calculated; b) might be calculated; c) must be calculated.

6. Complete the sentences.

A body is formally regarded as1) if the distance be­tween any set of two points in it is 2) . In reality no body is perfectly rigid. When equal and opposite forces are applied to a body, it is always deformed slightly 3) . The body's own tendency 4) has the effect of applying counterforces to whatever is apply­ing the forces, thus obeying Newton's third law. Calling a body rigid means that the changes in the5) are small enough to be neglected.

a) compressed or stretched; b) rigid; c) to restore the deformation; d) always constant; e) dimensions of the body.