题目

物理题Indicate whether the following statements are always true or can be false
A.If a net force acts on an object,the object's velocity will change.
B.During the collision of a large truck with a car,the car exerts an equal size force on the truck as the truck exerts on the car.
C.If two objects have the same acceleration,they are under the influence of equal forces.
D.If an object's speed does not change,no net force is acting on the object.(Notice:speed,not velocity!)
E.In the absence of friction or air resistance of any kind,a car initially moving at a constant velocity will slow down unless a small net force is applied.
F.The net force which acts on an object which remains at rest is zero.

提问时间：2020-10-26

答案

A,B,F are always true
C,D can be false
E is always false