A 75 kg boy is skiing down a slope from a height of 25 m with an initial speed of 12 m/s. What is his speed at the bottom of the slope? A spring has a spring constant of 120 N/m. How much potential energy is stored in the spring as it is stretched 0.30 m? A bike rider (85 kg) starts up a hill with a speed of 8.5 m/s. At what height will the bike come to a stop? Momentum and Impulse Impulse . Equations Units . . What causes an impulse? What does an impulse do to an object? Momentum Equation Units What is conservation of momentum? . . Types of collisions - name and explain differences 0 1. o 2. O 3. Which has a greater momentum: a heavy truck at rest or a moving skateboard? Explain. O DA{\ ICe skater skates at a velocity of 3 m/s. The skater then speeds up so that the velocity is Increased to 5 m/s. The momentum of the skater a) increased c) decreased b) stayed the same d) became zero As a school bus approaches a stop sign, the driver applies the brakes and brings the bus to 2 slow, gradual stop. If the driver had instead stomped on the brakes and brought the busto a sudden stop, the magnitude of the impulse would be a) greater than the gradual stop. c) less than the gradual stop. b) equal to the gradual stop. d) zero. A baseball is thrown very fast. Another baseball of equal mass is thrown with a very slow speed. Which of the following statements is correct? a) The fast-moving ball is harder to stop because it has more momentum. b) The slow-moving ball is harder to stop because it has more momentum. c) The fast-moving ball is easier to stop because it has more momentum. d) The slow-moving ball is easier to stop because it has more momentum. A ball is moving at 4.5 m/s and has a momentum of 34.7 kg-m/s. What is the ball's mass? A constant force of 8.00 N acts on a 2.50 kg object for 12.5 s. a) What is the object's change in momentum? b) What is the object's change in velocity? Two groups in canoes float motionless (at rest) in the middle of a lake. Someone in canoe 1 (m = 195 kg) pushes on canoe 2 (mass = 180 kg). Afterward canoe 1 is moving 1.3 m/s to the left what is the velocity of canoe 2? ' Anthony and Sally are participating in the \"Roll-a-Rama\" While 75 kg Anthony rollerskates backwards at 3.0 m/s roller skating dance championship. velocity of 5.0 m/s in the same direction. How-'fas_t' does 60 kg S.allyjumps into his arms with a the pair roll backwards together