The Effect of Force on Objects Quiz

What happens to the acceleration of a car on a ramp if the mass of the car is increased, assuming the force applied remains constant?

• The acceleration increases.

• The acceleration decreases.

• The acceleration remains the same.

• The car stops moving.

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TEKS.SCI.5.7B

What is the dependent variable in an experiment where a car is rolled down a ramp to measure how far it travels?

• The height of the ramp.

• The distance the car travels.

• The type of car used.

• The surface of the ramp.

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TEKS.SCI.5.7B

What is the relationship between mass and acceleration when the force applied is constant?

• They are directly proportional.

• They are inversely proportional.

• They are not related.

• They are equal.

Answer explanation

According to Newton's second law, F = ma. When force (F) is constant, an increase in mass (m) results in a decrease in acceleration (a), indicating they are inversely proportional.

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NGSS.MS-PS2-2

If a car is placed on a ramp with a steeper incline, what effect does this have on the car's acceleration?

• The acceleration decreases.

• The acceleration increases.

• The acceleration remains the same.

• The car moves backward.

Answer explanation

A steeper incline increases the component of gravitational force acting along the ramp, leading to greater acceleration of the car. Therefore, the correct answer is that the acceleration increases.

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In an experiment with a balloon rocket, what would be considered the dependent variable?

• The type of string used.

• The distance the balloon travels.

• The amount of air in the balloon.

• The color of the balloon.

Answer explanation

The dependent variable is what you measure in an experiment. In this case, the distance the balloon travels depends on factors like air amount and string type, making it the correct choice.

If the mass of a car is doubled while the force applied remains the same, what happens to the car's acceleration?

• It doubles.

• It halves.

• It remains the same.

• It becomes zero.

Answer explanation

According to Newton's second law (F = ma), if the force remains constant and the mass is doubled, the acceleration must decrease. Specifically, it halves because acceleration is inversely proportional to mass.

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NGSS.MS-PS2-2

How does increasing the mass of an object affect its acceleration when the same force is applied?

• The acceleration increases.

• The acceleration decreases.

• The acceleration remains constant.

• The object moves in the opposite direction.

Answer explanation

According to Newton's second law, F = ma. If the mass increases while the force remains constant, the acceleration (a) must decrease, as a = F/m. Thus, the correct answer is that the acceleration decreases.

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NGSS.MS-PS2-2

Which of the following is an independent variable in an experiment testing the effect of incline angle on a car's speed?

• The speed of the car.

• The incline angle of the ramp.

• The mass of the car.

• The color of the car.

Answer explanation

The incline angle of the ramp is the independent variable because it is the factor being manipulated to observe its effect on the car's speed, which is the dependent variable.

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The acceleration of an object (a)   if the force applied to it is increased while its mass remains constant.

• The acceleration decreases.

• The acceleration increases.

• The acceleration remains the same.

• The object stops moving.

Answer explanation

According to Newton's second law, acceleration is directly proportional to the net force acting on an object and inversely proportional to its mass. If the force increases while mass remains constant, the acceleration increases.

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NGSS.MS-PS2-2

In an experiment testing the effect of mass on acceleration, the (a)   is an independent variable.

• The acceleration of the object.

• The mass of the object.

• The force applied to the object.

• The color of the object.

Answer explanation

In this experiment, the independent variable is what is changed to observe its effect on acceleration. Here, the mass of the object is varied, making it the independent variable, while acceleration is the dependent variable.

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NGSS.MS-PS2-2