Question 1

The diagram shows a duck swimming in a stream in the opposite direction the stream is flowing. The duck pushes against the water, so the water pushes the duck forward with $20$ newtons of force. The water also exerts $15$ newtons of resistive force against the duck.

Which statement best describes the resulting motion of the duck?

Accepted Answer

The duck will continue moving in its current direction.

Answer

The duck will stop moving.

Answer

The duck will stop and then start moving again.

Answer

The duck will move in the direction that the stream is flowing.

Question 2

A sea turtle swims east against a current. The water pushes the turtle forward with 40 N east, while the current and drag push 28 N west. The turtle’s mass is 20 kg.

Which statement best describes the resulting motion?

Accepted Answer

The turtle will keep moving east and speed up.

Answer

The turtle will stop moving.

Answer

The turtle will slow down and reverse to the west.

Answer

The turtle will keep moving east at the same speed.

Question 3

A skateboarder is already rolling north at a constant speed. A friend pulls with 18 N north, while rolling resistance is 18 N south.

What happens next?

Accepted Answer

The skateboarder continues north at the same speed.

Answer

The skateboarder accelerates north.

Answer

The skateboarder slows down and stops.

Answer

The skateboarder reverses direction.

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