1. When an astronaut is drifting in space, he will travel at a constant speed in a straight line forever if no force act on it. 2. Lighter vehicles accelerate faster than heavier vehicles. 3. When we walk on the ground, our foot pushes the ground backward, and as a reaction, the ground pushes our foot forward.
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- 1. Suppose a car is involved in a collision in which it is brought to a constant speed of 31 "/s. Fortunately, the seat belt worn by the 65 kg driver brought the driver to rest in 0.35 s. How much force is exerted by the seat on the driver? Compute for the acceleration experienced by the driver during collision.13. You are in an elevator that is traveling upward, but slowing down at a rate of 2 m/s?. If your mass is 60 kg, what is your apparent weight during this period? This one is also from the Normal force slideshow/video, near end of the unit. lenovo2. Astronauts in space (aboard the International Space Station, for instance) are effectively weightless. Suppose an astronaut gently throws a tool to a companion. What type of path (a circle, parabola, straight line, zigzag etc.) will the tool follow? Once let go, which of the three laws is the tool explicitly obeying?
- 46. If a constant, nonzero force is applied to an object, what can you say about the velocity and acceleration of the object? A. Velocity is constant; acceleration varies B. Velocity varies; acceleration constant C. Velocity is constant; acceleration constant D. Velocity varies; acceleration varies 47. Static friction VARIES from zero to its maximum value. A. True B. False 48. The normal force is ALWAYS ___ to the surface. A. Parallel B. Perpendicular C. Neither60. An 8.0-kilogram block and a 2.0-kilogram block rest on a horizontal frictionless surface. When horizontal force F is applied to the 8.0-kilogram block, it accelerates at 5.0 meters per second east. If the same force was applied to the 2.0-kilogram block, the magnitude of the block's acceleration would be (1) 1.3 m/s2 (2) 2.5 m/s2 (3) 10. m/s2 (4) 20. m/s SHOW WORK, CIRCLE ANSWER, WRITE NEAT18. According to Newton's third law, every force is accompanied by an equal and opposite reaction force. The reason that these forces do not cancel each other is a. the action force acts for a longer time period b. the two forces are not always in the same direction c. one of the two forces is greater than the other d. the two forces act upon different objects; only forces on the same object can balance each other. e. . nonsense! They do cancel each other. Objects accelerate because of the presence of a third force Justify your answer:
- 7. If we know an object is moving at constant velocity, then we can be certain... the net force acting on the object is zero. the object is losing mass. the object is accelerating. there are no forces acting on the object.1. A 100-g box slides across a frictionless horizontal plane and is accelerating at 15 m/s2. What is the opposing force needed to reduce the acceleration to 5 m/s2. Note that the question is asking for the opposing force to the original force, NOT the resultant force that results to 5 m/s2.1. Your friend's daughter slides down an icy sliding board. Her motion can be described as motion with: a. A constant speed b. A constant acceleration greater than 10 m/s² C. A constant acceleration less than 10 m/s² d. A constant speed that depends on the steepness of the sliding board 2. A bowler lifts a bowling ball from the floor and places it on a rack. If you know the weight of the ball, what else must you know in order to calculate the work she does on the ball? a. Ball's diameter b. Rack height Lift time C. d. Lifter mass 3. A bug rides on a phonograph record. In which direction does the acceleration of the bug point? Tangent to the circular path Toward the center of the record C. Away from the center of the record d. up a. b.