3.Name the force due to which every object falls on earth.
4. What do you mean by pressure?
5. What kind of force is friction?
6. Is it true that force acting on an object can also change its shape?
7. What is a force?
8. What is muscular force?
9. A force of 100 N is applied on an area of 4 m2. Compute pressure being applied on the area.
10. Two thermocol balls held close to each other move away from each other. When they are released, name the force which might be responsible for this phenomenon. Explain.
11. What is the similarity between electrostatic and magnetic forces?
12. Why it is easier to walk on soft sand if we have flat shoes rather than shoes with sharp heels (or pencil heels)?
13. Which force is responsible for downward movement of a parachutes? Will he come down with the same speed without the parachute?
answer every question or any 5 questions pls
Answers
Explanation:
3 GRAVITY
4 Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
7 A force is a push or pull upon an object resulting from the object's interaction with another object.
8Force which is exerted by muscles of the body is called Muscular force
12 Because flat shoes exert more friction as compared to sharp heels.
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Answer:
3. The answer is gravity
4. Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
5. Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other
6. YES, IT TURE That force acting on an object can change its shape.
7. A force is a push or pull upon an object resulting from the object's interaction with another object.
8. Force which is exerted by muscles of the body is called Muscular force.
9. Formula used: In this solution we will be using the following formula;
⇒P=FA where P is the pressure exerted on a body due to a force, F is the force exerted on the body, and A is the area of which the force encompasses or area of the surface of interest.
Complete step by step solution:
During some dynamic or statics analysis especially areas like fluid mechanics, hydrodynamics and aerodynamics, when we are not interested in the force exerted on the entire surface upon, we use the concept of pressure as a measure of the force on a unit area of that surface. To say that the pressure exerted on a surface is X Pa or XNm−2 is to say that X amount of force is exerted on 1m2 of area of that surface. Similarly, for the cases where the force may actually not have encompassed an area up to 1m−2 , it is a measure of how much force need to be exerted on 1m2 area to create the same effect has it as the force has done to the smaller area. The mathematical expression for the force is given as
⇒P=FA where P is the pressure exerted on a body due to a force, F is the force exerted on the body, and A is the area of which the force encompasses.
Hence to calculate the pressure, we insert the known values given in the question and we get
⇒P=FA=1004=25Nm−2=25Pa.
10. Two Thermocol balls held close to each other move away from each other, which is because of electrostatic force. The balls having similar charges move away due to repulsion between similar charges.
11. Electric fields are produced by two kinds of charges, positive and negative. Magnetic fields are associated with two magnetic poles, north and south, although they are also produced by charges (but moving charges). Like poles repel; unlike poles attract.
12. A flat shoe increases the area of contact with the ground . Hence , the pressure ( force / area) on the ground is much less in case of a flat shoe as compared to a pencil heeled shoe and walking is easier.
13 . Force of gravity.