Unit 4 - Colliding Galaxies

What does Newton’s 1st Law state?

• An object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force.

• Force equals mass times acceleration.

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

• Energy cannot be created or destroyed.

Give an example of Newton’s 1st Law.

• A book resting on a table remains at rest until someone moves it.

• A car accelerating down the highway.

• A ball thrown into the air follows a curved path.

• A magnet attracting iron filings.

What does Newton’s 2nd Law state?

• Newton's 2nd Law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

• Newton's 2nd Law states that every action has an equal and opposite reaction.

• Newton's 2nd Law states that objects at rest stay at rest and objects in motion stay in motion unless acted upon by a net external force.

• Newton's 2nd Law states that energy cannot be created or destroyed, only transformed.

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Give an example of Newton’s 2nd Law.

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

• A book resting on a table.

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

• A satellite orbiting the Earth.

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What is net force?

• The total force acting on an object

• The force of gravity on an object

• The force of friction on an object

• The force of air resistance on an object

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What is the difference between balanced vs unbalanced force in regards to motion?

• Balanced forces do not change the motion of an object, while unbalanced forces do.

• Balanced forces change the motion of an object, while unbalanced forces do not.

• Both balanced and unbalanced forces change the motion of an object.

• Neither balanced nor unbalanced forces change the motion of an object.

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What is acceleration?

• The rate of change of velocity

• The rate of change of speed

• The rate of change of distance

• The rate of change of time

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Under what circumstances does acceleration occur?

• When an object changes its speed

• When an object changes its direction

• When an object changes both speed and direction

• All of the above

What formula is used for Newton’s 2nd Law?

• F = ma

• V = IR

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How does the formula for Newton’s 2nd Law change when solving for acceleration?

• The formula becomes F = ma.

• The formula becomes a = F/m.

• The formula becomes m = F/a.

• The formula becomes a = m/F.