Changing an object’s momentum
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The document discusses momentum, impulse, and the impulse-momentum theorem. It provides examples of how to use these concepts to solve physics problems involving changes in an object's momentum due to an applied force over time. Sample problems include calculating the impulse imparted to a ball based on its mass and final velocity, and determining an object's mass given the force applied and time taken to stop its motion.
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Lecture 8
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2) Momentum is defined as the product of an object's mass and velocity. It represents the difficulty of stopping or changing the motion of an object. Objects with greater mass or velocity have greater momentum.
3) The change in an object's momentum is called impulse. Impulse depends on both the magnitude of the force applied and the duration of its application. A longer application of force results in a greater change in momentum.
Md zakaria 2
1) Forces only exist as a result of an interaction between two objects. Balanced forces do not cause a change in motion as they are equal in size and opposite in direction. Unbalanced forces always cause a change in motion as they are not equal and opposite.
2) The first law of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
3) The second law of motion states that the rate of change of momentum of an object is directly proportional to the applied force and changes in the same direction as the applied force. Mathematically, this is expressed as Force = Mass ×
Unit 6, Lesson 5 - Newton's Laws of Motion
Unit 6, Lesson 5 - Newton's Laws of Motion
Lesson Outline:
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2. Law of Acceleration
3. Law of Interaction
4. Momentum and Impulse: An Overview
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- Several examples are provided to demonstrate how to calculate momentum, impulse, mass, velocity, force, and time using the standard
4 action and reaction
Newton's third law of motion states that for every action, there is an equal and opposite reaction. Rockets accelerate into space due to the reaction force from escaping gases propelling the rocket forward. Momentum is defined as an object's mass multiplied by its velocity, and the total momentum in a system remains constant unless an outside force acts upon it, as illustrated through examples of changes in speed and momentum.
Force and laws of motion 2
1. The document discusses Newton's laws of motion and related concepts like momentum, force, and collisions.
2. Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It is expressed as F=ma.
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Topic 3 - Newtons Laws L1 (1).pdf
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grade 12 momentum.pptx
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Momentum-and-Impulse-Powerpoint.pdf
Momentum is a measurement of mass in motion, calculated as momentum (P) equals mass (m) multiplied by velocity (v). Newton found that the total momentum of an isolated system is conserved before and after collisions. Impulse is the change in an object's momentum due to an applied force over time and can be calculated as impulse (I) equals force (F) multiplied by time (t). Increasing either the force or time of an impulse increases the impulse applied. Crumple zones in cars are designed to increase the time over which a decelerating force is applied during a collision, reducing the overall force felt by occupants.
Newton's law of motion
Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.
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Changing an object’s momentum
- 2. When will the momentum changes? If the mass and/or velocity of an object changes, the momentum of an object changes.
- 3. Using Newton’s 2nd Law of Motion F=ma F= m(v/t) F= mv/t F= p/t Ft= p Impulse-Momentum Ft= m(Vf-Vi) Theorem
- 4. Impulse-Momentum Theorem This theorem states that the net external force applied to an object for a certain time will cause a change in object’s momentum equal to the product of force and time interval.
- 5. Impulse I=Ft I=mv I=p Therefore, the unit of impulse is the same as the momentum which is kg m/s.
- 6. Sample problems: 1. The 1.5kg ball gains a speed of 95m/s when Gary hits it. What impulse does he impart to the ball? 2. A 55kg boy is driving his car at a speed of 20m/s. He sees an old woman crossing the road so he steps on the brake to avoid hitting the woman. His seatbelt brings his body to a stop at 0.5s. What is the average force does the seatbelt exert on him?
- 7. Answers 1. Given: m= 1.5kg v= 95m/s Solution: I= mv I= 1.5(95) I= 142.50 kg m/s
- 8. 2. Given: m= 55kg v= 20m/s t= 0.50s Solution: Fnet= mv/t Fnet= {55(20)}/0.5 Fnet= 2200N
- 9. Seatwork1 Solve the following problems. Show the complete solution and write the given. 1. If Lea imparts a 56kg m/s impulse on a 3kg ball, how fast does the ball moves? 2. A boy is driving his car at a speed of 35m/s. He sees an old woman crossing the road so he steps on the brake to avoid hitting the woman. His seatbelt brings his body to a stop at 1s and exerted a 3600 N force to him. What is the mass of the boy?