1) Which of the following quantities are units of momentum? (There could be more than one correct choice.) A) N/s B) kg . s/m C) N . m D) kg . m2/s2 E) kg . m/s 2) When a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow the circular path? A) the friction force from the road B) gravity C) the normal force from the road D) No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration. 3) The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth? A) Both mass and weight are the same. B) Both mass and weight are less. C) Mass is the same, weight is less D) Mass is less, weight is the same. 4) You throw a baseball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down. A) The work is positive on the way up and positive on the way down. B) The work is positive on the way up and negative on the way down. C) The work is negative on the way up and positive on the way down. D) The work is negative on the way up and on the way down because gravity is always downward. 5) King Kong falls from the top of the Empire State Building, through the air (air friction is present), to the ground below. How does his kinetic energy (K) just before striking the ground compare to his potential energy (U) at the top of the building? A) K is greater than U. B) K is equal to U. C) K is less than U. D) It is impossible to tell. 6) A satellite is in orbit around the earth. Which one feels the greater force? A) the satellite because the earth is so much more massive B) It depends on the distance of the satellite from Earth. C) the earth because the satellite has so little mass D) Earth and the satellite feel exactly the same force