D0112025d01 - Name Class Date ID A Web practice Chapter 4...

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Name: ______________________ Class: _________________ Date: _________ ID: A 1 Web practice Chapter 4 Newton's Laws of Motion Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. If we know an object is moving at constant velocity, we may assume: a. the net force acting on the object is zero. b. there are no forces acting on the object. c. the object is accelerating. d. the object is losing mass. e. the net force acting on the object isn't zero. ____ 2. What condition must apply to a system's state of motion for it to be regarded as an inertial frame of reference? a. in decreasing velocity b. in constant velocity c. in constant acceleration d. in increasing acceleration e. in increasing velocity ____ 3. A 7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration? a. 35 m/s 2 b. 7.0 m/s 2 c. 5.0 m/s 2 d. 0.71 m/s 2 e. 0.52 m/s 2 ____ 4. The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What net force would be required to accelerate a 20-kg object at 6.0 m/s 2 on the moon? a. 1.3 N b. 20 N c. 33 N d. 120 N e. 130 N ____ 5. A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest (45 ° N of W). What is the magnitude of the resultant acceleration? a. 2.2 m/s 2 b. 2.1 m/s 2 c. 1.5 m/s 2 d. 3.0 m/s 2 e. 1.2 m/s 2 ____ 6. A cart of weight 20 N is accelerated across a level surface at 0.15 m/s 2 . What net force acts on the wagon? ( g = 9.8 m/s 2 ) a. 0.92 N b. 0.31 N c. 3.0 N d. 4.5 N e. 5.2 N

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Name: ______________________ ID: A 2 ____ 7. Rita accelerates a 0.40-kg ball from rest to 9.0 m/s during the 0.15 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick? a. 48 N b. 72 N c. 24 N d. 60 N e. 76 N ____ 8. A 70.0-kg man jumps 1.00 m down onto a concrete walkway. His downward motion stops in 0.0200 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones? a. 15 500 N b. 7 010 N c. 4 900 N d. 3 500 N e. 2.600 N ____ 9. The accelerating force of the wind on a small 200-kg sailboat is 707 N northeast. If the drag of the keel is 500 N acting west, what is the acceleration of the boat? a.
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D0112025d01 - Name Class Date ID A Web practice Chapter 4...

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