1) A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon? a) It would cause the wagon to move faster. b) It would cause the wagon to change mass. c) It would cause the wagon to change direction. d) It would cause the wagon to slow down. 2) A runner measured the time it took him to run 5 km. What can he calculate from the distance and time measurements? a) direction b) mass c) speed d) force 3) Which best explains why a bicycle slows down when its brakes are applied? a) The brakes heat the rubber on the bicycle tires. b) The brakes add energy to the bicycle. c) The brakes increase the force of gravity on the bicycle. d) The brakes cause frictional forces on the wheels of the bicycle. 4) A ball is kicked and rolls along a level field until it comes to a stop. What is most responsible for the ball coming to a stop? a) air b) gravity c) mass d) friction 5) If a car is moving backward along a road, can its speed be measured? a) Yes, it can, because the car does not have friction acting on it. b) Yes, it can, because the car travels a distance in a certain amount of time. c) No, it cannot, because speed can only be measured if the car is moving forward. d) No, it cannot, because the distance traveled backward by a car cannot be measured. 6) Scientists discover an asteroid that is moving through space. What information is needed to determine the average speed of the asteroid? a) the mass and size of the asteroid b) the distance the asteroid is from Earth c) the direction the asteroid is moving and its distance from Earth d) how far the asteroid has moved in 24 hours 7) What causes a wagon to speed up when going down a hill? a) gravity b) friction c) air pressure d) mass 8) A bowling ball moves across a flat surface at 7 feet per second. If a student is asked to calculate the total distance traveled by the ball, what other information does the student need to know? a) amount of friction between the ball and the surface b) amount of force applied to the ball c) total time the ball rolled d) mass of the ball

Forces in Motion

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