Unit 1 DFA Practice

Which diagram shows the direction of the two balls after the collision?

• A. [Diagram: Both balls moving away from each other in opposite directions]

• B. [Diagram: Both balls moving to the left]

• C. [Diagram: Both balls moving away from each other at an angle]

• D. [Diagram: Both balls moving away from each other at a different angle]

Tags

NGSS.MS-PS2-1

How do seat belts protect passengers when a vehicle moving at a high speed stops abruptly?

• Seat belts prevent all forward motion of the passengers due to their inertia.

• Seat belts reduce the amount of forward motion of the passengers due to their inertia.

• Seat belts reduce the amount of forward motion of the passengers by decreasing the inertia of the car.

• Seat belts prevent all forward motion of the passengers by increasing the inertia of the car.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force. Which law best explains this event?

• The Law of Universal Gravity

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

Which example will result in no motion?

• A. [Diagram: 20 N left, 18 N box, 20 N right]

• B. [Diagram: 12 N left, 10 N box, 5 N right]

• C. [Diagram: 2 N left, 18 N box, 19 N right]

• D. [Diagram: 4 N left, 10 N box, 14 N right]

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

At which point on the graph is the object at rest?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

John drove a truck for one hour at a rate of 80 kilometers per hour (km/hr). The next hour, he drove at 100 km/hr. What was his average speed during those two hours?

• 90 km/hr

• 85 km/hr

• 95 km/hr

• 100 km/hr

What will happen to the force of gravitational attraction between the objects shown if one of the two objects is doubled in size?

• It will increase.

• It will decrease.

• It will stay the same.

• It will repel.

Tags

NGSS.MS-PS2-4

Planets X and Y orbit each other in space. Which changes would have the greatest effect on increasing the gravitational attraction between the two planets?

_______________ of planet X and ____________ between the planets

• doubling the mass
• halving the mass

• doubling the distance

• halving the distance

Tags

NGSS.MS-PS2-2

Which is needed to determine the amount of gravitational force between two objects?

• weight and time

• distance and mass

• volume and mass

• area and weight

When riding a roller coaster, an electric motor pulls the roller coaster to the top of the first hill. What force pulls the roller coaster down the hill?

• friction

• speed

• gravity

• mass

Tags

NGSS.MS-PS2-4