Multiple answer- cirle s u) 1. A car drives along a flat road with a constant ac
ID: 1784503 • Letter: M
Question
Multiple answer- cirle s u) 1. A car drives along a flat road with a constant acceleration. Which of the following MUST BE true? The force of the engine is balanced by the forces of friction and drag. The weight of the car is balanced by the normal force. a) The car's velocity is changing. The car will eventually change the direction in which it is moving. The net force on the car is zero. 2. Shirley Muldowney is one of the greatest NHRA Top Fuel drag racers of all time Nicknamed "Cha Cha," she was the first person ever to win three NHRA Top Fuel championships. For a particular race her mechanics decide to put less fuel in the gas tank. Ignore friction and air resistance. As a result her dragster now: a) Accelerates more quickly Feels a stronger normal force from the ground Feels a weaker force of gravity d) Takes less time to get to the finish line (assuming it doesn't run out of fuel) e) Accelerates at a constant rate 3. Which of these are true about "weight" force (i.e., the force of gravity) on Earth: a) It is always equal to the mass of the object times 9.8 m/si b) It is always down. c) It is the only force that does not obey Newton's 3rd law It is the only force measured in units of pounds (lbs) not Newtons. e)t is always equal and opposite the normal force. 4. Which of these are true about the "normal" force? It is always up. b) It is always equal and opposite the weight force. It is the only force that does not obey Newton's 3nd law. ) It only exists if the object is on a solid surface. e) It is named after physicist Abby Normal.Explanation / Answer
1. When a car is moving with constant acceleration it means that the rate of change of velocity of the car is constant. So the velocity is always changing. So the correct options are :
(a) The car's velocity is changing
(b) The force on the engine is being balanced by the forces of friction and drag.
(c) The weight of the car is balanced by the normal force.
3. The correct options are : (a), (b)
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