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Question

D.A hockey puck slides along a rough concrete surface.E.A cockroach is speeding up from rest.F.A rock is thrown horizontally; air resistance is negligible.G.A rock is thrown horizontally; air resistance is substantial.H.A rock is dropped vertically; air resistance is negligible.I.A rock is dropped vertically; air resistance is substantial.J.

Part H Which of these situations describe the motion shown in the motion diagram at point A?Type the letters corresponding to all the right answers in alphabetical order. Do not use commas. For instance, if you think that only situations C and D are correct, type CD.

Part I Which of these situations describe the motion shown in the motion diagram at point B?Type the letters corresponding to all the right answersin alphabetical order. Do not use commas. For instance, if you think that only situations C and D are correct, type CD.

MasteringPhysics: Assignment Print View

Part J Which of these situations describe the motion shown in the motion diagram at point C?Type the letters corresponding to all the right answers in alphabetical order. Do not use commas. For instance, if you think that only situations C and D are correct, type CD.

Understanding Newton’s Laws

Part A An object cannot remain at rest unless which of the following holds?

Hint A.1 How to approach the problemHint not displayed

Hint A.2 Newton’s 1st law: a body at restHint not displayed

The net force acting on it is zero.

The net force acting on it is constant and nonzero.

There are no forces at all acting on it.

There is only one force acting on it.

If there is a net force acting on a body, regardless of whether it is a constant force, the body accelerates. If the body is at rest and the net force acting on it is zero, then it will remain at rest. The net force could be zero either because there are no forces acting on the body at all or because several forces are acting on the body but they all cancel out.

Part B If a block is moving to the left at a constant velocity, what can one conclude?

Hint B.1How to approach the problemHint not displayed

Hint B.2 Newton’s 1st law: a body in motionHint not displayed

There is exactly one force applied to the block.

The net force applied to the block is directed to the left.

The net force applied to the block is zero.

There must be no forces at all applied to the block.

If there is a net force acting on a body, regardless of whether the body is already moving, the body accelerates. If

MasteringPhysics: Assignment Print View

a body is moving with constant velocity, then it is not accelerating and the net force acting on it is zero. The net force could be zero either because there are no forces acting on the body at all or because several forces are acting on the body but they all cancel out.

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