21 POINTS

Label each statement "1," "2," or "3" for the law of motion it illustrates.

Pushing a baby on a swing is easier than pushing an adult on the same swing.

Water spills from a glass carried by someone who is walking steadily and suddenly stops short.

When thrown with the same force, a soccer ball accelerates more than a bowling ball.

A magician pulls a tablecloth out from under a dish on a table without disturbing the dish.

A rocket launches into space, pushing fuel exhaust in one direction and the rocket in the opposite direction.

A book rests on top of a shelf and does not move until a student accidentally knocks it off.

Think About It
You exert the same force on two objects of different masses. Which object will have the greater acceleration? Explain your answer.

Who was the first scientist to measure speed as distance over time?

An airplane is flying with a velocity of 240 m/s at an angle of 30.0∘ with the horizontal, as the drawing shows. when the altitude of the plane is 2.4km,a flare is released from the plane. the flare hits the target on the ground. what is the angle θ?

Multiple choice. choose the one alternative that best completes the statement or answers the question. 1) if the force on an object is in the negative direction, the work it does on the object must be 1) a) negative. b) positive. c) the work could be either positive or negative, depending on the direction the object moves. 2) a truck has four times the mass of a car and is moving with twice the speed of the car. if kt and kc refer to the kinetic energies of truck and car respectively, it is correct to say that 2) a) kt = 16kc . b) kt = 1 2 kc. c) kt = kc . d) kt = 2kc . e) kt = 4kc . 3) you and your friend, who weighs the same as you, want to go to the top of the eiffel tower. your friend takes the elevator straight up. you decide to walk up the spiral stairway, taking longer to do so. compare the gravitational