Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon.

the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster?
a) use less air in the balloon.
b) blow up the balloon more.
c) use a longer straw.
d) use larger tires.

What can Sandy do to make the toy car move faster?

The Answer is B) Blow p the balloon more

Explanation:

A) Use less air in the balloon. Its wrong because what we need is to make the toy car move faster and if its source is the air inside the balloon, removing air will cause it to move less.

B) Blow up the balloon more. It is correct because if you blow up the balloon more, the air inside it escapes through the straw faster and will increase the speed of the toy car.

C) Use a longer straw. It is wrong because what we are looking for is to increase the speed of the toy car, and that is only achieved by reducing the weight of the toy car or increasing the force applied to its movement. The straw has nothing to do with it.

D) Use larger tires. It is wrong because using larger tires increases the weight of the toy car and as the air in the balloon remains the same there would be no changes in speed.

answer; (cognitive   dissonance);

answer; psychological influences;