hour). The collision will change both cars’ momentum. But‚ because no force from outside the system has acted on the cars‚ their total momentum remains zero"(DiscoverySchool.com). Back to my example‚ although both cars were going the same speed‚ one driver lived while the other died. While this may seem like driver A was wearing his lucky tie‚ probing deeper into the case proves that physics saved his life. Sir Isaac Newton was the first man to explain what happens in a collision. He proposed
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Pzf Review 2. Two-body collision process: Linear momentum is conserved for a closed and isolated two-body system during collision because there is no net external force. Total kinetic energy of the system of two colliding bodies may or may not be conserved. If it is conserved‚ the collision is called an elastic collision. If the kinetic energy of the system is not conserved‚ the collision is called an inelastic collision. Completely inelastic collision: deformation is totally irreversible
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Name: ____________________________ Date: ____________________Period:____________ PHYSICS FINAL EXAM REVIEW Chapters 5-13 Ways to study for your exam: * Review past tests‚ quizzes‚ homework assignments‚ and vocabulary sheets * Review notes * Read textbook chapters (especially summary pages at the end of each chapter) * Complete this Review guide * Write practice essay questions and have your instructor grade them You should be able to: * Define all vocabulary words
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FRICTION Friction is necessary for walking due to the following reason‚ As per Newton’s third law of motion‚ (every action has an equal and opposite reaction) we can walk if and only if the ground we are walking on push our feet back with a force. Now‚ as per the third law the ground would definitely push our feet back but if we are walking on a perfectly smooth ground which has no friction our force would simply cancel out the force reverted by the ground and we would fall. If there was no
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has only ONE correct answer. Write only the letter (A–D) next to the question number (2.1–2.10) in the ANSWER BOOK. 2.1 A car of mass m collides head-on with a truck of mass 2m. If the car exerts a force of magnitude F on the truck during the collision‚ the magnitude of the force that the truck exerts on the car is … A 2.2 An object moves in a straight line on a ROUGH horizontal surface. If the net work done on the object is zero‚ then … A. the object has zero kinetic energy. B. the
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kinetic energy and mass. Section 9.2 Impulse and Momentum 6. A friend claims that‚ as long as he has his seatbelt on‚ he can hold on to a 12.0-kg child in a 60.0 mi/h head-on collision with a brick wall‚ in which the car passenger compartment comes to a stop in 0.050 0 s. Show that the violent force during the collision will tear the child from his arms. A child should always be in a toddler seat secured with a seat belt in the back seat of a car. 7. An estimated force-time curve for a
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Chapter 1: Forces Define force Force: a push or a pull FORCE IS A VECTOR (HAS A SIZE & A DIRECTION) Units: Newtons 1 N = the force required to accelerate a 1 kg mass 1 m/s2 1 N= 0.225 lbs 1 lb = 4.448 N Classify forces Internal Forces: forces that act within the object of system whose motion is being investigated Pulling= tensile forces (putting the structure under tension) Pushing= compressive forces (putting the structure under compression) Internal forces hold things together when
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impulse. This idea explains the reason why us softball players are taught to reach our arms all the way back and follow through. Collisions: In an intense steal from first to second base‚ or second base to home‚ many skilled base runners attempt to topple over their opponent to get called safe by a field umpire. This collision is considered an inelastic collision because the defensive player tends to fall on top of the offensive player sliding into them when they then both move forward toward
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if ��(��‚ ��‚ ��) = 3�� 2 + 4�� 3 + �� 2 is a scalar field find the �������� ���� �� at point (1‚-2‚ 3)? (5) 2(a) Define elastic and inelastic collisions. Derive expressions for the final velocities of two particles having elastic collisio n on a straight line and discuss any of two particular cases (1 +4+2) 2(b) An object of mass 2 kg makes an elastic collision with another object at rest a nd continues to move in the original direction but with one-fourth of its original speed. What is the mass
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systems‚ however‚ non-conservative forces‚ like frictional forces‚ will be present‚ but often they are of negligible values and the mechanical energy’s being constant can therefore be a useful approximation. Inelastic collisions‚ the mechanical energy is conserved but in inelastic collisions‚ some mechanical energy is converted into heat. The equivalence between lost mechanical energy and an increase in temperature was discovered by James Prescott Joule. Many modern devices‚ such as the electric
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