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Questions and Answers
When a body is stationary, which of the following is true? (Select all that apply)
When a body is stationary, which of the following is true? (Select all that apply)
- The force acting on it is not in contact with it
- The body is in vacuum
- There is no force acting on it
- The combination of forces acting on it balances each other (correct)
Newton's Third Law is equivalent to the?
Newton's Third Law is equivalent to the?
- Law of conservation of linear momentum (correct)
- Law of conservation of angular momentum
- Law of conservation of energy
- Law of conservation of energy and mass
In the case of a horse pulling a cart, the force that causes the horse to move forward is the force that:
In the case of a horse pulling a cart, the force that causes the horse to move forward is the force that:
- The horse exerts on the ground
- The ground exerts on the horse (correct)
- The horse exerts on the cart
- The cart exerts on the horse
What is the force exerted on the 2kg block by the 1kg block, given that forces of 6N and 3N are acting on them?
What is the force exerted on the 2kg block by the 1kg block, given that forces of 6N and 3N are acting on them?
A force of 6N acts on a body at rest of mass 1 kg. What is the time for which the force acts on the body if it attains a velocity of 30 m/s?
A force of 6N acts on a body at rest of mass 1 kg. What is the time for which the force acts on the body if it attains a velocity of 30 m/s?
What would be the weight of a bird cage assembly if a 1 kg bird is inside a 1.5 kg cage?
What would be the weight of a bird cage assembly if a 1 kg bird is inside a 1.5 kg cage?
When standing still in an elevator, the force felt by a boy with a mass of 40 kg will be greatest when the elevator:
When standing still in an elevator, the force felt by a boy with a mass of 40 kg will be greatest when the elevator:
What would be the reading on the scale if a man weighing 80 kg is in a lift moving upwards with an acceleration of 5 m/s²?
What would be the reading on the scale if a man weighing 80 kg is in a lift moving upwards with an acceleration of 5 m/s²?
What is the tension in a uniform thick rope of length 5m, applying a force of 5N at one end, at 1m from that end?
What is the tension in a uniform thick rope of length 5m, applying a force of 5N at one end, at 1m from that end?
If the velocity of end 'A' of a rigid rod situated between two smooth vertical walls moves with velocity 'u', what is the velocity of end 'B'?
If the velocity of end 'A' of a rigid rod situated between two smooth vertical walls moves with velocity 'u', what is the velocity of end 'B'?
What is the net force acting on a body if the linear momentum P varies with time according to P = x + yt²?
What is the net force acting on a body if the linear momentum P varies with time according to P = x + yt²?
How much average force is necessary to stop a hammer having momentum 25 N-s in 0.05 seconds?
How much average force is necessary to stop a hammer having momentum 25 N-s in 0.05 seconds?
What speed does a ship of mass 2 × 10^7 kg acquire after being displaced 25 m by applying a force of 25 × 10^5 N?
What speed does a ship of mass 2 × 10^7 kg acquire after being displaced 25 m by applying a force of 25 × 10^5 N?
What force acts on a body of mass 0.1 kg to achieve a velocity of 10 m/s in 0.1 s?
What force acts on a body of mass 0.1 kg to achieve a velocity of 10 m/s in 0.1 s?
A Diwali rocket ejects gases at a velocity of 400 m/s with a rate of 0.05 kg/s. What is the accelerating force on the rocket?
A Diwali rocket ejects gases at a velocity of 400 m/s with a rate of 0.05 kg/s. What is the accelerating force on the rocket?
How much force does a player experience when catching a ball of mass 150 g moving at 20 m/s in 0.1 s?
How much force does a player experience when catching a ball of mass 150 g moving at 20 m/s in 0.1 s?
When a lift of mass 1000 kg moves upwards with an acceleration of 1 m/s², what is the tension in the string connected to it?
When a lift of mass 1000 kg moves upwards with an acceleration of 1 m/s², what is the tension in the string connected to it?
What is the maximum acceleration with which a 20 kg monkey can climb up a rope when a mass of 25 kg is suspended from it?
What is the maximum acceleration with which a 20 kg monkey can climb up a rope when a mass of 25 kg is suspended from it?
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Study Notes
Newton's Laws of Motion: Key Concepts
- A stationary body does not imply no forces act on it; balance of forces is crucial.
- Newton's Third Law correlates with conservation of linear momentum, indicating reciprocal actions.
- In a horse-cart scenario, the horse’s forward movement is due to the ground's reaction force.
Forces and Motion
- Analyzing forces acting on blocks on a frictionless surface is essential for understanding inter-block interactions.
- A force applied to a stationary mass affects its velocity over a time period dependent on the mass.
Weight and Acceleration in Elevators
- The force experienced by a person varies with the elevator’s motion: highest when accelerating upward.
- Scale readings will increase when in ascension due to the interplay of gravitational and inertial forces.
Tension and Acceleration in Ropes
- Understanding tension involves analyzing force distribution within a rope on a frictionless surface.
- Acceleration of mass blocks in a pulley system must consider both gravitational forces and the mechanical advantage.
Momentum and Force Calculations
- Linear momentum varies with time; thus, net force can be established through differentiation with respect to time.
- Stopping a moving object requires calculating the average force based on momentum and time intervals.
Practical Applications of Physics
- Force exerted by a rocket uses combustion dynamics, factoring mass flow and speed of gas ejection.
- When catching moving objects, the exerted force can be derived using the change in momentum over time taken for the action.
Dynamics of Lifts and Tension
- Tension in a lift’s cable is greater when it is accelerating upward, incorporating weight and resultant force from acceleration.
Force Limits in Climbing Situations
- Maximum acceleration allowed for a climber influences tension, considering the threshold before load exceeds structural limits of the rope.
General Notes
- Physics concepts such as acceleration, gravity, mass, and force interactions are essential for analysis in various scenarios.
- Calculations related to force, tension, acceleration, and momentum are crucial in understanding motion dynamics in real-life applications.
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