# Chapt_10 - University Physics(Prof David Flory Chapt_10...

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University Physics (Prof. David Flory) Chapt_10 Wednesday, October 24, 2007 Page 1 Name: __________________________ Date: _____________ 1. An inelastic collision is one in which: A) momentum is not conserved but kinetic energy is conserved B) total mass is not conserved but momentum is conserved C) neither kinetic energy nor momentum is conserved D) momentum is conserved but kinetic energy is not conserved E) the total impulse is equal to the change in kinetic energy 2. Whenever an object strikes a stationary object of equal mass: A) the two objects cannot stick together B) the collision must be elastic C) the first object must stop D) momentum is not necessarily conserved E) none of the above 3. Objects A and B interact with each other via both conservative and nonconservative forces. Let K A and K B be the kinetic energies, U be the potential energy, and E thermal be the thermal energy. If no external agent does work on the objects then: A) K A + U is conserved B) K A + U + E thermal is conserved C) K A + K B + E thermal is conserved D) K A + K B + U is conserved E) K A + K B + U + E thermal is conserved Write the letter for the correct answer on the answer sheet. Write clearly.

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University Physics (Prof. David Flory) Chapt_10 Wednesday, October 24, 2007 Page 2 4. A rectangular block is moving along a frictionless path when it encounters the circular loop as shown. The block passes points 1, 2, 3, 4, 1 before returning to the horizontal track. At point 3: A) its mechanical energy is a minimum B) the forces on it sum to zero C) it is not accelerating D) its speed is a minimum E) it experiences a net upward force 5. A 0.75-kg block slides on a rough horizontal table top. Just before it hits a horizontal ideal spring its speed is 3.5 m/s. It compresses the spring 5.7 cm before coming to rest. If the spring constant is 1200 N/m, the thermal energy of the block and the table top must have: A) not changed B) decreased by 1.9 J C) decreased by 2.6 J D) increased by 1.9 J E) increased by 2.6 J Write the letter for the correct answer on the answer sheet. Write clearly.
University Physics (Prof. David Flory) Chapt_10 Wednesday, October 24, 2007 Page 3 6. A block is released from rest at point P and slides along the frictionless track shown. At point Q, its speed is: A) 12 2 gh h B) 2 g ( h 1 h 2 ) C) ( h 1 h 2 )/2 g D) 2( ) E) ( h 1 h 2 ) 2 /2 g 7.

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Chapt_10 - University Physics(Prof David Flory Chapt_10...

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