S1.25_Inertia

Multiple Choice

Which forces are acting on a rocket before launch, and what is their effect on the rocket's motion?

• Gravity and normal force; the rocket remains stationary

• Thrust and drag; the rocket moves upward

• Gravity and thrust; the rocket accelerates downward

• Drag and normal force; the rocket moves sideways

Multiple Choice

During a rocket launch, which force must be greater for the rocket to lift off the ground?

• Thrust

• Gravity

• Drag

• Friction

Fill in the Blank

After the thrust has stopped, what are the only forces acting on the rocket?

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​https://interactives.ck12.org/simulations/physics/everglades-airboat/app/

Multiple Choice

Which of Newton's Laws best explains why the airboat continues to move after the engine is turned off, and why does it eventually stop?

• Newton's First Law (Inertia)

• Newton's Second Law (F=ma)

• Newton's Third Law (Action-Reaction)

• Law of Universal Gravitation

Fill in the Blank

Newton's ___ Law explains why the dishes stay on the table when the tablecloth is quickly pulled out from under them.

Multiple Choice

Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place and throw a rock. The rock will –

• gradually stop.

• continue in motion in the same direction at constant speed.

• continue to accelerate at 9.8 m/s² in the direction it was thrown.

• lose mass.

Multiple Choice

Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the Jell-O with a greater speed it will have a greater inertia. Tosh argues that inertia does not depend upon speed, but rather upon mass. Who do you agree with?

• Mac

• Tosh

Multiple Choice

You are driving an airboat in the swamps of Louisiana giving a tour of the ecosystem. Your boat is heavily loaded with tourists so you increase the thrust until it is greater than the drag, this will have which of the following effects?

• You will maintain constant velocity

• You will slow to a stop

• You will accelerate

• Your boat will be in equilibrium

Multiple Choice

Which of the following best describes the concept of inertia as it relates to a rocket launch?

• The rocket remains at rest until a force is applied.

• The rocket moves faster as it burns more fuel.

• The rocket changes direction due to wind.

• The rocket launches because of gravity.