Entrance Tic ket: Newton's First and 2nd Laws

What does Newton's First Law of Motion state?

• An object in motion will eventually stop unless acted upon by a force.

• An object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity unless acted upon by a net external force.

• The force acting on an object is equal to the mass of the object times its acceleration.

• For every action, there is an equal and opposite reaction.

Which of the following best describes inertia?

• The tendency of an object to change its state of motion.

• The resistance of an object to any change in its state of motion.

• The force required to accelerate an object.

• The speed of an object in a given direction.

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If a car is moving at a constant velocity, what can be said about the net force acting on it?

• The net force is positive.

• The net force is negative.

• The net force is zero.

• The net force is equal to the weight of the car.

A 10 kg object is subjected to a net force of 50 N. What is the acceleration of the object?

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Explain how mass and inertia are related.

• Mass is the measure of inertia; the greater the mass, the greater the inertia.

• Inertia is the measure of mass; the greater the inertia, the lesser the mass.

• Mass and inertia are unrelated.

• Inertia is the force required to change the mass of an object.

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NGSS.MS-PS2-2

A force of 10 N is applied to a 2 kg object. If the object starts from rest, what will be its velocity after 3 seconds?

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Discuss the effect of increasing mass on the acceleration of an object when the same force is applied.

• Increasing mass increases acceleration.

• Increasing mass decreases acceleration.

• Increasing mass has no effect on acceleration.

• Increasing mass doubles the acceleration.

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Which of the following scenarios best illustrates Newton's Second Law of Motion?

• A book resting on a table.

• A car accelerating when the driver steps on the gas pedal.

• A ball rolling on a flat surface at constant speed.

• A person pushing against a wall and not moving.

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NGSS.MS-PS2-2