Question

1. You are swinging back and forth in arcs through the air on a playground swing. At the moment you reach the lowest point in your forward swing, your acceleration vector points

a. backward. (B) forward. (C) downward. (D) upward. (E) nowhere, it is zero.

2. You hang a mass of 270 grams from the ceiling by a 65 centimeter long string and cause it to swing in a horizontal circle at a constant speed. It makes an angle of 55◦ with the ceiling as it moves. What is the size of the net force acting on the mass? (A) 4.6 N (B) 3.2 N (C) 2.7 N (D) 1.9 N (E) 1.5 N

3. You dribble a basketball. During the bounce, the basketball goes from having an initial downward velocity of 12 m/s to a final upward velocity of 10 m/s. Which statement is true about the net force on the ball during the bounce? (A) The average net force is directed straight down during the bounce. (B) The average net force is directed straight up during the bounce. (C) The average net force is zero during the bounce. (D) None of the above are true statements.

8. A person was driving a car when it crashed into a tree and came to a stop. Because his airbag went off, the driver’s face and chest collided with the air bag rather than with the steering wheel. The chances of serious injury are reduced by hitting the air bag because: (A) the driver transfers the same amount of momentum to the air bag as he would to the steering wheel, but he does it with smaller force due to the air bag. (B) the driver transfers the same amount of momentum to the air bag as he would to the steering wheel, but he does it with larger force due to the air bag. (C) the driver transfers more momentum to the air bag than he would the steering wheel. (D) the driver transfers less momentum to the air bag than he would the steering wheel.

Answer 1

8. As rate of change if komemtum decrease menaing force decreses to friver colided with smaller force aA). Is your answer.

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