10 Questions
An object is projected vertically upwards from the ground with an initial velocity of 20 m/s. If the acceleration due to gravity is 9.8 m/s², what is the maximum height reached by the object?
Maximum height = v₀² / (2g) = (20)² / (2 × 9.8) = 20.4 m
A 2 kg block is moving at 4 m/s when it collides with a stationary block of 3 kg. If the collision is perfectly inelastic, what is the velocity of the combined blocks after collision?
Using conservation of momentum, we get: v = (m₁v₁) / (m₁ + m₂) = (2 × 4) / (2 + 3) = 2.67 m/s
A force of 5 N is applied to an object, causing it to move 2 m in the direction of the force. If the object starts from rest, what is the work done on the object?
Work done = Force × Distance = 5 N × 2 m = 10 J
A resistor of 10 Ω is connected to a 12 V battery. What is the current flowing through the resistor?
Using Ohm's law, we get: I = V / R = 12 V / 10 Ω = 1.2 A
An electric heater of 500 W is used to heat water for 30 minutes. How much electrical energy is consumed?
Electrical energy = Power × Time = 500 W × (30 × 60) s = 90000 J or 90 kJ
What is the physical principle that states that the total momentum of a closed system remains constant over time, as long as there are no external forces acting on the system?
The principle of conservation of momentum.
During a collision, what happens to the total momentum of the system if the collision is perfectly inelastic?
The total momentum of the system remains the same before and after the collision.
In a collision between two objects, what determines the final velocity of the combined system after the collision?
The final velocity of the combined system is determined by the initial momentum of each object and the conservation of momentum.
What is the key assumption that allows us to apply the principle of conservation of momentum to a system?
The system is closed, meaning there are no external forces acting on the system.
In a real-world scenario, what might be an example of a situation where the principle of conservation of momentum is applied?
A car crash, where the momentum of the vehicles before the collision is conserved after the collision.
Practice and learn physics concepts with this booklet of problems and solutions covering vertical motion, projectile motion, conservation of momentum, work, and electrical energy. Improve your understanding of fundamental physics principles. Test your skills and check your answers with the provided solutions.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
