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 effect do balanced forces have on a moving object?

• They do not change the object's speed.

• They change the object's direction.

• They stop the object immediately.

• They cause the object to accelerate.

How do balanced forces affect an object that is not moving?

• They keep it at rest.

• They cause it to start moving.

• They make it rotate.

• They have no effect.

What results from unbalanced forces acting on an object?

• The object's motion remains unchanged.

• The object's speed and direction change.

• The object levitates.

• The object becomes weightless.

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.

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 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 illustrates the effect of an unbalanced force in tennis?

• The balls levitating.

• The net stopping the balls.

• The balls moving when struck.

• The balls rotating on their own.

What does the car jack demonstrate in terms of forces?

• Frictional force acting alone.

• Gravity pulling the car downwards only.

• Unbalanced force lifting the car.

• Balanced forces keeping the car at rest.

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.