8.7 Understanding Newton's Laws of Motion

What is the formula for calculating acceleration according to Newton's Second Law of Motion?

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TEKS.SCI.8.7A

If a car travels 150 meters in 10 seconds, what is its average speed?

• 10 m/s

• 15 m/s

• 20 m/s

• 25 m/s

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TEKS.SCI.7.7A

Which of the following best describes Newton's First Law of Motion?

• 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.

• The acceleration of an object is dependent on the net force and mass.

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TEKS.SCI.8.7B

A box is pushed with a force of 20 N to the right and 10 N to the left. What is the net force acting on the box?

• 10 N to the right

• 10 N to the left

• 30 N to the right

• 30 N to the left

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TEKS.SCI.6.7B

How does Newton's Third Law of Motion apply to a rocket launch?

• The rocket's engines push down on the ground, and the ground pushes the rocket upwards.

• The rocket's mass decreases as fuel is burned, increasing acceleration.

• The rocket's speed is constant due to balanced forces.

• The rocket's acceleration is independent of its mass.

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TEKS.SCI.8.7B

A cyclist travels 30 km in 2 hours. What is the cyclist's average speed?

• 10 km/h

• 15 km/h

• 20 km/h

• 25 km/h

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TEKS.SCI.7.7A

Which graph best represents an object moving at a constant speed?

• A straight horizontal line

• A straight line with a positive slope

• A curved line

• A straight line with a negative slope

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TEKS.SCI.7.7C

If a force of 50 N is applied to a 5 kg object, what is the acceleration of the object?

• 5 m/s²

• 10 m/s²

• 15 m/s²

• 20 m/s²

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TEKS.SCI.8.7A

Describe how vehicle restraints use Newton's Laws of Motion to protect passengers.

• They apply a force opposite to the motion to stop passengers.

• They increase the mass of passengers to reduce acceleration.

• They decrease the net force acting on passengers.

• They allow passengers to move freely during a collision.

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TEKS.SCI.8.7B

A force of 30 N is applied to a stationary object, causing it to move. What can be inferred about the forces acting on the object?

• The forces are balanced.

• The forces are unbalanced.

• The net force is zero.

• The object is in equilibrium.

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TEKS.SCI.6.7B