Forces and Motion -REVIEW STAAR

In the example of the pool balls, what causes the red balls to move?

• Gravity acting alone.

• Magnetic field interaction.

• Balanced forces from the pool table.

• An unbalanced force from the white ball.

What does Newton's first law of motion state about an object at rest?

• It remains at rest unless acted upon by an unbalanced force.

• It will move without any force.

• It changes direction spontaneously.

• It accelerates without external influence.

What happens when the moving car strikes the car at rest?

• The moving car stops instantly.

• The resting car remains unmoved.

• The cars exchange colors.

• The resting car moves due to the unbalanced force.

What keeps the weights from moving before the weightlifter acts?

• Balanced forces between gravity and the rack.

• Only the structural strength of the rack.

• An unbalanced force from the weightlifter.

• Only the gravitational pull.

What happens when two unbalanced forces act in opposite directions?

• They cancel each other out completely.

• Their combined force is the difference between the two forces.

• They multiply each other's effect.

• Their combined force equals the sum of the two forces.

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A car is moving at a constant speed on a straight road. According to Newton's First Law of Motion, what can be inferred about the forces acting on the car?

• The forces are balanced.

• The forces are unbalanced.

• There are no forces acting on the car.

• The car is accelerating.

Tags

TEKS.SCI.7.7D

A 5 kg object is subjected to a net force of 20 N. What is the acceleration of the object?

• 2 m/s²

• 4 m/s²

• 5 m/s²

• 10 m/s²

Tags

TEKS.SCI.8.7A

A book is lying on a table. Which of the following statements best describes the forces acting on the book?

• The forces are unbalanced, causing the book to move.

• The forces are balanced, keeping the book at rest.

• There are no forces acting on the book.

• The book is accelerating upwards.

Tags

TEKS.SCI.6.7B

A 10 kg object is accelerating at 3 m/s². What is the net force acting on the object?

• 10 N

• 30 N

• 3 N

• 13 N

Tags

TEKS.SCI.8.7A