Newton's Laws

What is the shape of a projectile's trajectory?

• a line

• a semicircle

• a parabola

• none of the above

A boy pushes on a heavy box, but it does not move. What force is resisting the boy's push?

• static friction

• kinetic friction

• the force of gravity

• normal force

Neglecting air resistance, the horizontal velocity of a projectile_____.

• increases as it falls

• decreases as it falls

• it is constant

• depends on the vertical velocity

Which of the following is not true about the force of friction?

• it opposes motion

• it acts between any two solid bodies that are in contact

• it acts only on objects that are at rest

• it can act on a solid body that is traveling through a liquid

What effect does the force of gravity have on a projectile while it is in the air?

• the force of gravity produces a downward acceleration

• the force of gravity produces an upward acceleration

• the force of gravity produces a horizontal acceleration

• the force of gravity does not affect the projectile

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Kinetic friction acts on two bodies that are ____ relative to each other.

• moving

• at rest

• accelerating

• decelerating

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What affects the vertical velocity of a projectile over time?

• the acceleration due to gravity

• the horizontal velocity

• forces in both the vertical and horizontal direction

• nothing affects the vertical velocity, and therefore it remains constant

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Which physical law most directly describes the motions of objects that are acted on by forces?

• Newton's law of universal gravitation

• Newton's second law of motion

• Coulomb's law of electrostatic interaction

• The Conservation of Mass law

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According to Newton's law of universal gravitation, which of the following changes would increase the gravitational force between two massive objects most?

• doubling the distance between them

• halving the distance between them

• doubling one of the masses

• halving one of the masses

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In which case are Newton's laws not valid?

• for a moving object inside a train that is rounding a bend

• when an object is sitting on the floor at rest

• when an object in motion is subject to a force

• for a stationary object on a table

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