Science LESSON: Newton's Laws [WIMS 8th Grade]

Multiple Choice

Which of the following is the metric unit for measuring force?

• Newton (N)

• Joule (J)

• Watt (W)

• Meter (m)

Fill in the Blank

Fill in the blank: To calculate net force, you ___ forces that are acting in the same direction and ___ forces that are acting in opposite directions.

Multiple Choice

Which of the following statements about balanced forces is correct?

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

• Balanced forces cause an object to accelerate.

• Balanced forces always act in opposite directions.

• Balanced forces result in a net force greater than zero.

Multiple Select

Select all statements that are true about unbalanced forces.

• Unbalanced forces do not cancel completely.

• Unbalanced forces cause acceleration in the direction of the net force.

• Unbalanced forces result in zero net force.

• Unbalanced forces always act in the same direction.

Multiple Choice

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

• An object at rest will remain at rest and an object in motion will remain in motion unless a net force acts upon it.

• An object will accelerate if a net force is applied.

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

• Objects with smaller mass have greater inertia.

Open Ended

How does this comic demonstrate the Law of Inertia?

Multiple Choice

According to Newton's Second Law of Motion, what happens to the acceleration of an object if its mass decreases and the force applied remains the same?

• Acceleration increases.

• Acceleration decreases.

• Acceleration stays the same.

• Acceleration becomes zero.

Multiple Select

Which of the following statements are correct according to Newton's Second Law of Motion?

• Acceleration and mass are inversely proportional.

• Acceleration and force are directly proportional.

• Force is measured in Newtons (N).

• Mass is measured in meters (m).

Fill in the Blank

Fill in the blank: The equation representing Newton's Second Law of Motion is F = ___ x a.

Multiple Choice

Which of the following is an example of an action-reaction force pair?

• A person sitting on a chair and the chair pushing up on the person

• A person lifting a box

• A car accelerating on a road

• A ball rolling down a hill

Multiple Choice

Which of the following statements about friction is correct?

• Friction helps objects move faster on smooth surfaces

• Friction opposes the motion between two surfaces that touch

• Friction only occurs between rough surfaces

• Friction does not affect moving objects

Fill in the Blank

Friction is caused by the rough edges of one object ___ to the rough edges of another object.

Multiple Select

Select all the factors that increase friction between two surfaces.

• Rougher surfaces

• Greater force pushing surfaces together

• Smoother surfaces

• Smaller force pushing surfaces together

Multiple Choice

Which of the following best describes the difference between mass and weight?

• Mass is the amount of matter in an object, while weight is the gravitational force acting on it.

• Mass is the gravitational force acting on an object, while weight is the amount of matter in it.

• Mass and weight are the same on every planet.

• Weight never changes, but mass does depending on location.

Multiple Choice

Based on the diagrams and information provided, why would you weigh less on Mars than on Earth even if your mass stays the same?

• Mars has less gravitational pull than Earth.

• Mars is closer to the Sun than Earth.

• Mars has more air resistance than Earth.

• Mars is larger than Earth.

Multiple Choice

The balls SHOULD hit the ground at the SAME TIME because…

• The acceleration due to gravity of ALL objects is the same (9.8 m/s²).

• The heavier ball falls faster due to more weight.

• The lighter ball is affected more by air resistance.

• Gravity only acts on heavy objects.

Fill in the Blank

Air resistance is caused by the friction between the surface of a moving object and the ___.

Multiple Select

Which of the following factors increase air resistance on a moving object?

• Greater surface area

• Faster speed

• Smoother surface

• Less mass

Multiple Choice

Which of the following best explains why a feather falls slower than a bowling ball when dropped from the same height in air?

• The feather has more air resistance due to its shape and surface area.

• The feather is lighter than the bowling ball.

• Gravity acts less on the feather.

• The bowling ball is rounder than the feather.

Fill in the Blank

A force is any ___ or ___ that is applied to an object.