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Clicker question 1

The area under a velocity-versus-time graph of anobject’s motion is:A. the object’s speed at that point.B. the object’s acceleration at that point.C. the distance traveled by the object to that point.D. the displacement of the object.E. huh?

Clicker question 1

The area under a velocity-versus-time graph of anobject’s motion is:A. the object’s speed at that point.B. the object’s acceleration at that point.C. the distance traveled by the object to that point.D. the displacement of the object. X

E. huh?

Example problem: Chameleons

Example problem: Chameleons

Chameleons catch insects with their tongues, which theycan extend to great lengths at great speeds. A chameleonis aiming for an insect at a distance of 18 cm. The insectsenses the attack and get away after 50 ms. In this first50 ms, the chameleon’s tongue accelerates at 250 m/s2

for 20 ms, then travels at constant speed for theremaining 30 ms. Does the tongue reach the 18 cmextension it needs to catch the insect during this time?

Clicker Question 2

Two identical stones are dropped from a tallbuilding, one after the other. Assuming airresistance is negligible, what will happen to thevertical distance between the stones?A. It will increase.B. It will decrease.C. It will remain the same.D. It will first increase and then remain constant.

Clicker Question 2

Two identical stones are dropped from a tallbuilding, one after the other. Assuming airresistance is negligible, what will happen to thevertical distance between the stones?A. It will increase. X

B. It will decrease.C. It will remain the same.D. It will first increase and then remain constant.