| Board | CBSE |
| Useful for | Class 9 Students |
| Subject | Science |
| Chapter | Gravitation |
| Topic | Thrust and Pressure |
| Type of Questions | Numerical Problems |
| Answers Provided | Yes |
| Format | Question-Answer Format |
| Important Link | Class 9 Science Numerical Problems |
Numericals Based on Class 9 Science Thrust and Pressure
Here we are providing numericals based on class 9 science thrust and pressure. Students are suggested to go through each and every numerical for better understanding of concepts.
Thrust and Pressure Numericals
Q.1. A force of 100 N is applied on an object of area 2 m2. Calculate the pressure.
Q.2. The force on a phonogram needle is 1.2 N. The point has a circular cross-section of radius 0.1mm. What pressure does it exert on the record in (i) Pa (ii) atm ?
Q.3. A nail is driven into a wooden board by using a hammer. The impact of the hammer on the head of nail produces a thrust of 25 N. If the area of the head is 0.5 mm2 and of the tip 0.1 mm2, find the pressure on the head and the tip of the nail.
Q.4. A force of 15 N is uniformly distributed over an area of 150 m2. Find the pressure in pascals.
Q.5. A block of wood is kept on a table top. The mass of the wooden block is 5 kg and its dimension are 40 cm x 20 cm x 10 cm. Find the pressure exerted by the wooden block on the table top if it is made to lie on the table with its sides of dimensions (a) 20 cm x 10 cm (b) 40 cm x 20 cm. Given g = 9.8 m/s2.
Q.6. How much force should be applied on an area of 1 cm2 to get a pressure of 15 Pa?
Q.7. A block weighing 1.0 kg is in the shape of a cube of length 10 cm. It is kept on a horizontal table. Find the pressure on the portion of the table where the block is kept.
Q.8. Find the thrust acting on the human body due to atmospheric pressure. Take the surface area of a man of middle size to be 1.5 m2 and atmospheric pressure (1 atm) = 1.013 x 105 Pa.
Q.9. A boy weighing 60 kg f is wearing shoes with heel area of cross section 20 cm2 while a girl weighing 45 kg f is wearing shoes with heel of area of cross section 1.5 cm2. Compare the pressure exerted on ground by their heels when they stand on the heel of one floor.
Q.10. A cube of edge length 10 cm is placed inside a liquid. The pressure at the centre of the face is 15 Pa. Find the force exerted by the liquid on this face.
Q.11. A force of 16 N is distributed uniformly on one surface of a cube of edge 8 cm. Find the pressure on this surface.
Q.12. A car weighs 1200 kg. This weight is evenly distributed on 4 wheels. If the pressure in each tyre is 15 kg wf/cm2, what is the area of each tyre in contact.
Q.13. Calculate the greatest and the least pressure exerted by a metal block of size 20 cm x 8 cm
x 5 cm and having a mass of 5 kg.
Q.14. A hydraulic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of the piston carrying the load is 425 cm2. What maximum pressure would the smaller piston have to bear?
Q.15. The pressure due to atmosphere is 1.013 x 105 Pa. Find the force exerted by the atmosphere on the top surface of a table 2.0 m long and 1.0 m wide.
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Frequently Asked Questions (FAQs)
Answer: Thrust is the force exerted perpendicular to the surface of an object due to pressure. It is the result of a pressure difference between the two sides of an object. The greater the pressure difference, the greater the thrust.
Answer: Pressure is calculated by dividing the force applied on an object by the area over which the force is distributed. The formula for pressure is:
Pressure (P) = Force (F) / Area (A)
The SI unit of pressure is the Pascal (Pa), which is equivalent to 1 Newton per square meter (1 N/m²).
Answer: Atmospheric pressure is the pressure exerted by the weight of the air above a given point on Earth’s surface. It decreases with increasing altitude. At sea level, standard atmospheric pressure is approximately 101.3 kPa (kilopascals). As you ascend in altitude, atmospheric pressure decreases because there is less air above pushing down.
Answer: The shape of an object can significantly affect the pressure it exerts on a surface. Pressure is directly proportional to the force applied but inversely proportional to the area over which the force is distributed. Smaller surface areas result in higher pressure for the same force, while larger surface areas result in lower pressure. So, objects with pointed or sharp edges exert higher pressure than objects with flat surfaces.
Answer: Certainly! Thrust and pressure have various practical applications in everyday life. For example:
Hydraulic systems: Hydraulic systems use the principles of pressure to transmit force and amplify it. They are commonly used in car brakes, lifts, and construction equipment.
Flying and aerodynamics: Aircraft and birds use thrust to generate lift, allowing them to stay airborne. The shape of their wings and the pressure difference above and below them enable this.
Swimming: Swimmers use the concept of thrust by pushing water backward with their arms and legs to move forward. The force applied over a larger area creates thrust, propelling the swimmer.
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The site is very helpful but it would be more better if we could also get answers to the questions not the whole solution but just the answers will do…so that if we solve the questions we have answers with us to talky them.
Thanking you.
We will add answers too.
The site is very helpful but it would be more better if we could also get answers to the questions not the whole solution but just the answers will do…so that if we solve the questions we have answers with us to talky them.
Thanking you.
could really use some answers to the questions given to correct ourselves