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Unformatted text preview: 2004 Test Physics Honors Chapter 6 Test: Momentum and Impulse Form 1 p mv = v v p F t ∆ = ∆ v v f N F F μ = cos W Fd θ = 1f 2f 90 θ θ- = o sometimes 1o 1f 2o 2f v v v v + = + v v v v sometimes 1f 2f v v = v v sometimes 2 1 2 K mv = g U mgh = 2 1 Δ 2 e U k x = sin sin sin a b c a b c θ θ θ = = Law of Sines 2 2 2 2 cos c a b ab θ = +- Law of Cosines A 0.1 kg dart is thrown at a 2.0 kg block of wood that rests on a flat, rough surface. The initial velocity of the dart is 30 m/s [W]. The dart sticks in the block, and the dart and block together slide a distance of 50 cm before coming to rest. 1) If the dart accelerates for 0.015 s after it strikes the block, what average force acts on the dart? 2) What is the coefficient of kinetic friction between the block and the surface? A 0.20-kg ball is sliding on a frictionless, horizontal surface with a velocity of 2.5 m/s [S] when it elastically collides with a 0.20-kg ball that is at rest. After the collision, one ball is moving at 2.25 m/s. 3) What is the velocity of the other ball after the collision? Superman (mass m = 125 kg) is flying north at 10.0 m/s. Lois Lane (mass m = 50 kg) is falling from the top of a tall building. Superman catches Lois when she has a speed of 40 m/s. 4) What is Superman’s velocity just after he catches Lois? A 75-g rubber ball moving north at 8 m/s strikes a 50-g rubber ball moving south at 5 m/s. 5) After the collision, what is the maximum velocity of the 50-g ball? 6) If after the collision the 75-g ball comes to rest, what impulse acts on the 50-g ball? 7) If after the collision the 75-g ball comes to rest, what is the final velocity of the 50-g ball? 8) What is the maximum amount of heat and sound energy that can be produced by this collision? A 10-g block sliding due west at 2.0 m/s collides with a stationary 8.0-g block on a frictionless surface. The two- dimensional collision converts 20% of the 10-g block’s energy into heat and sound. After the collision, the 10-g block is sliding at 1.50 m/s. 9) What is the final velocity of the 8-g block? 2005 Test Physics Honors Chapter 6 Test: Momentum and Impulse version 1 sometimes sometimes sometimes Law of Sines Law of Cosines A 0.1 kg dart is thrown at a dartboard with an initial velocity of 10 m/s [W]. It accelerates for 0.015 s as it comes to a stop in the dartboard. 1) What impulse acts on the dart? A 0.20-kg ball is sliding on a frictionless, horizontal surface with a velocity of 2.5 m/s [S] when it elastically collides with a 0.20- kg ball that is at rest. After the collision, one ball is moving at 2.15 m/s in a generally southeast direction....
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