Indicate whether the following statements are always true or can be false. #1 Du
ID: 1655281 • Letter: I
Question
Indicate whether the following statements are always true or can be false.
#1 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.
#2 The net force which acts on an object that remains at rest is zero.
#3 If two objects are under the influence of equal forces, they have the same acceleration.
#4 If a non-zero net force acts on an object, the object's velocity will change.
#5 If a non-zero net force acts on an object, the object's speed will change.
#6 A bicycle initially moving at a constant velocity will slow down unless a small, non-zero net force is applied.
Explanation / Answer
1) According to Newton's third law of motion, The given situation is always true. Same force will exerted on the car by the truck.
2) Yes, the net force which acts on an object that remains at rest is zero. It is always true.
3) This statement is true if the masses of these two objects is same. Otherwise it is false for different masses objects. We can use relation F = mass* acceleration.
4) If a non-zero net force acts on an object, the object's velocity will change. It is always true. According to Newton's second law of motion, there is change in momentum so as in velocity. So this situation is always true.
5) It is always true. As explained in statement 4, because speed is scalar quantity of velocity.
6) It is also always true. To slow down a bicycle, other force is required which will oppose to its motion.