SPH4U - EXAM REVIEW - Unit 2: Energy & Momentum

SPH4U - EXAM REVIEW - Unit 2: Energy & Momentum Knowledge: I can explain key concepts Application: I can apply these concepts to real-life situations Thinking: I can solve problems involving these concepts

√ Key Concepts Related Questions Terms Explain the concepts of work, energy, Unit Review (pg. 274) #1, 2, work friction, and the work-energy theorem and 4-9, 11, 21, 22, 24 joule solve related problems kinetic energy Explain the concepts of gravitational Unit Review (pg. 274): work-energy theorem potential energy potential energy, conservation of energy, mechanical energy Hooke's Law, elastic potential energy, and M/C and T/F: #15, 19, 20, 25, gravitational potential energy simple harmonic motion and solve related 30 law of conservation of energy problems in one and two dimensions isolated system Problems: 69,71,77,83, 52 open system Describe technological applications Safety applications in vehicles Hooke's Law involving energy and explain how they - notes (shock absorbers in Spring constant can affect society and the environment cars) Ideal spring Elastic potential energy Amplitude Idea of a perpetual motion Simple harmonic motion machine Perpetual motion machine Damped harmonic motion Roller coasters Linear momentum Unit Review: (pg. 274): #89 Impulse Define momentum and impulse Collision Solve problems involving collisions using Unit Review (pg. 274): #53, Law of conservation of conservation of momentum in one and 91, 93 momentum Explosion two dimensions Elastic collision Distinguish between elastic and inelastic Unit Review (pg. 274): #60, Conservation of kinetic energy collisions 61, 62 Inelastic collision Analyze the results of head-on and Pg. 248, #3, 4 Perfectly elastic collision glancing collisions using conservation of Pg. 253 #2 Perfectly inelastic collision momentum

Work & Energy: 1. A 1.2 x 103 kg space probe, travelling initially at a speed of 9.5 x 103 m/s through deep space, fires its engines that produce a force of magnitude 9.2 x 104 N over a distance of 86 km. Determine the final speed of the probe (ans: 1.0 x 104 m/s)

2. A 73 kg skier costs up a hill inclined at 9.3 degrees to the horizontal. Friction is negligible. Use the work-energy theorem to determine how far along the hill the skier slides before stopping, if the initial speed at the bottom is 4.2 m/s (ans: 5.6 m)

3. An ideal spring is compressed 15 cm on a horizontal surface. When released, it accelerates a block (5 g) along the frictionless surface. The block leaves the spring launcher and then travels up a long ramp and stops when it reaches a height of 0.54 m. What is the spring constant of the spring? (ans: 2.35 N/m)

Momentum & Collision

1. A 5000 kg boxcar moving at 5.2 m/s on a level, frictionless track, runs into a stationary 8000 kg tank car. a) If they hook together during the collision, how fast will they be moving afterwards? (ans: 2.0 m/s [forward]) b) If the collision is somehow completely elastic, determine the speeds of the two cars after the collision. (ans: 1.2 m/s[backward] and 4.0 m/s [forward]

2. A 2000 kg car travelling east at 24 m/s enters an icy intersection and collides with a 3600 kg truck travelling at 10 m/s [S 20˚ W]. If they become coupled together in the collision, what is their velocity immediately after impact (size and direction) ? (ans: 8.8 m/s [E 43˚ S]