Indicate whether the following statements are always true or can be false. (Sele
ID: 2051063 • Letter: I
Question
Indicate whether the following statements are always true or can be false.(Select T-True, F-False. If the first is F and the rest T, enter
FTTTTT).
A) During the collision of a car with a large truck, the truck exerts an equal size force on the car as the car exerts on the truck.
B) An object's velocity will change if a non-zero net force acts on the object.
C) The net force which acts on an object which maintains a constant velocity is zero.
D) If a non-zero net force acts on an object, the object's speed will change.
E) If two objects are under the influence of equal forces, they have the same acceleration.
F) In order not to slow down, a car moving at a constant velocity needs a small net force applied.
Explanation / Answer
1 can be false. A truck moving on a road in air needs a small net force to counter road and air friction (this is why you must constantly use fuel despite driving in a straight line at constant speed). One moving in empty space in a vacuum would not. 2 can be false. The object could have a constant speed but a changing direction which would require a force to be applied, a great example is uniform circular motion 3 is true, 3rd law of motion 4 is true, 2nd law of motion 5 is true, 1st law of motion 6 can be false, If the mass of the objects is different the acceleration will be different