Question

(Please answer E and F regardless of if the statement is valid)

Consider the following:

If an object has a non-zero net force acting on it during an interval, then its speed changes during the interval.

a) Is this statement valid? __________

(b) If you contend the statement is valid, how do you know?

(c) If you contend the statement is invalid, what is wrong with it?

(d) If the statement is invalid, restate it to give a valid statement

(e) Is the valid statement (original, or your revision) a conditional or a bi-conditional? How do you know?

(f) Would the following investigation provide data to either support the valid hypothesis, contradict the valid hypothesis (either the original or your revision), or would it fail to test the hypothesis? Explain:

Twenty seven ice gliders move across a lake with zero net forces and their speeds are monitored throughout.

Answer 1

a.) Yes! The statement is valid.

b.) this comes from the newtons first law of motion or law of inertia.

e.) The statement is by conditional that means the statement "if the speed of object is changing in an interval that means there must always be some non-zero force acting on it." Is also equally valid.

f.) The investigation involving seven ice skaters proves the hypothesis because when skaters moves through ice there is no net zero force on them and hence their velocity is constant which support the hypothesis.