Unit 6-7 Assessment: Motion, Forces, Momentum

Two friends are driving down to school when a dog runs into the street. The driver slams on the breaks and their backpacks slide off the seat forward in the same direction they were moving.

Which of the following best explains why the objects moved in this direction?

• Objects in motion continue in motion until a net force is applied to it.

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

• Acceleration is directly proportional to the force applied.

• Energy must be conserved.

A 22.4 kg object is accelerating at 1.40 m/s². What net force is being applied to the object?

• 16 Newtons

• 0.0625 Newtons

• 31.4 Newtons

Tags

NGSS.MS-PS2-2

Which statement below best describes the motions of a small car and a school bus that have an equal amount of force applied?

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

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

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

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

Tags

NGSS.MS-PS2-2

A soccer ball rolling across the grass slows until it eventually stops. What net force is most directly responsible for causing the ball to stop moving?

• Friction

• Gravity

• Inertia

• Mass

Tags

NGSS.MS-PS2-2

Two students are playing on skateboards. The first student and their skateboard have a combined mass of 99.2 kg. The second student and their skateboard have a combined mass of 42.3 kg. The two students stand still on their skateboards facing each other and then push off on each other as hard as they can.

Refer to the information and diagram shown. Using the law of conservation of momentum, what is the speed of the second student?

• 2.35 m/s

• 3.20 m/s

• 7.50 m/s

• 13.2 m/s

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A toy car starts at rest, and then a force is applied to it which causes it to move to the right.

What force is being applied to the car?

• A balanced force to the right

• A balanced force to the left

• An unbalanced force to the right

• An unbalanced force to the left

Tags

NGSS.MS-PS2-2

A 10 kg bicycle is pushed with a force of 4 N. What is the acceleration of the bicycle?

• 0.4 m/s²

• 40 m/s²

• 2.5 m/s²

Tags

NGSS.MS-PS2-2

By definition, which of the following is an example of Velocity?

• 5 m/s

• 5 m/s²

• 5 m/s, North

• 5 m/s², North

Choose the example that demonstrates acceleration.

• A runner is moving at constant speed, in a straight line.

• A runner is moving at constant speed.

• A runner is moving backwards.

• A runner is moving at constant speed and changing direction.

What is the speed of a car that travels 30 km in 20 minutes?

• 1.5 m/s

• 0.7 m/s

• 600 m/s

• 50 m/s

Tags

NGSS.MS-PS3-1