Force & Motion exam prep

The diagram below shows a balloon rocket. When the air in the balloon is released, the rocket will move forward. Which of the following statements best describes the force that causes the movement in the situation explained above?

• The force of the balloon pushes upward on all sides when the air is released.

• The air outside the balloon pushes the balloon forward by opposing the released air.

• The force of the released air pushes backward as the balloon gets smaller.

• The gravitational force pulls the balloon downward when the air is released.

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NGSS.MS-PS2-1

A soccer ball rolling on the grass slows down until it finally stops. What net force is most directly responsible for making the ball stop moving?

• Friction

• Gravity

• Inertia

• Mass

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NGSS.MS-PS2-2

A car travels at a constant speed of 70 miles per hour. The car crashes into a concrete wall. What is the main factor affecting the movement of the car, the driver wearing a seatbelt, and the passenger not wearing a seatbelt?

• Inertia

• Friction

• Gravity

• Air resistance

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two friends are driving north when they have to brake suddenly to avoid an accident. They notice that all the objects in the trunk slide forward in the same direction they were moving. Which of the following options best explains why the objects moved in this direction?

• Objects in motion continue in motion until acted upon by a net force.

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

• Acceleration is directly proportional to the applied force.

• Energy must be conserved.

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NGSS.MS-PS2-1

A toy car starts at rest, and then a force is applied that causes it to move as seen in the diagram below. What force is being applied to the car shown above?

• A balanced force to the right

• A balanced force to the left

• An unbalanced force to the right

• An unbalanced force to the left

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NGSS.MS-PS2-2

While cleaning the science lab, a group of students must move a large box of beakers. To slide the box across the floor, the force of their push must counteract the force of -

• air resistance

• friction

• gravity

• mass

Tags

NGSS.MS-PS2-2

An object of 22.4 kg is accelerating at 1.40 m/s². What net force is being applied to the object? Record your answer. Be sure to use the correct place value.

• 31.36 N

• 20.00 N

• 50.00 N

• 10.00 N

Tags

NGSS.MS-PS2-2

Which statement best describes the movements of a small car and a school bus when the same amount of force is applied to them?

• The small car and the school bus will have equal acceleration.

• The bus will have greater acceleration than the small car.

• The small car will have greater acceleration than the bus.

• The small car will accelerate forward while the bus accelerates in the opposite direction.

Tags

NGSS.MS-PS2-2

With the same applied force, which of these will have a greater acceleration?

• 100 grams of mass

• 200 grams of mass

• 300 grams of mass

• All objects would have the same acceleration.

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NGSS.MS-PS2-2

Two boxes are dropped from an airplane, one with a mass of 100 kg and the other with a mass of 75 kg. How would the impact force between the two boxes compare?

• The box with less mass will have a greater impact force.

• The box with more mass will have a greater impact force.

• The boxes will have the same impact force.

• There is not enough information to determine which would have a greater impact force.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2