Forces and Momentum

An astronaut is in a spaceship far far away at a location where effects of gravity and friction are too small to be noticed. If the astronaut's spaceship turns off its engines, then...

• the spaceship will continue in motion with the same speed and direction.

• the spaceship will eventually stop as its inertia slowly becomes used up.

• the spaceship will speed up in the direction it was going as the spaceship loses its resistance.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

Which statement is true because of Newton's second law? F = ma.

• When the force on an object increases, the object's acceleration decreases.

• When the force on an object increases, the object's acceleration increases.

• When the force on an object decreases, the acceleration doesn't change.

• When the force on an object decreases, the object's acceleration increases.

Tags

NGSS.HS-PS2-1

Newton's 3rd law states that for every action, there is an_________ reaction

• unequal and opposite

• stronger and opposite

• equal and opposite

Tags

NGSS.MS-PS2-1

Inertia refers to _____

• the natural tendency that objects have to resist changing their motion (stubborness).

• the force which keeps moving objects in motion with a constant velocity.

• the force that keeps stationary objects at rest.

• the natural tendency that objects have to be attracted to other objects (loneliness).

Two cars collide and stick together. What type of collision is this, and is momentum conserved?

• Elastic collision; momentum is not conserved.

• Inelastic collision; momentum is conserved.

• Elastic collision; momentum is conserved.

• Inelastic collision; momentum is not conserved.

Tags

NGSS.HS-PS2-2

According to the Law of Conservation of Momentum, in the absence of external forces, the total momentum of a system

• Increases over time

• Decreases over time

• Remains constant

• Becomes zero

Tags

NGSS.HS-PS2-2

The Law of Conservation of Momentum states that the total momentum of a closed system is:

• Increasing over time

• Decreasing over time

• Constant, if no external forces act on it

• Zero

Tags

NGSS.HS-PS2-2

In a collision between two objects, which of the following statements is true regarding momentum?

• The total momentum before the collision is always greater than the total momentum after the collision.

• The total momentum before the collision is equal to the total momentum after the collision.

• The total momentum before the collision is always less than the total momentum after the collision.

• Momentum is not conserved in any type of collision.

Tags

NGSS.HS-PS2-2

What is required for two objects to have an elastic collision in a one-dimensional system?

• Their masses must be equal.

• They must collide head-on.

• They must not stick together after the collision.

• They must exchange their velocities.

Tags

NGSS.HS-PS2-2

In any collision (crash) the ______ is ALWAYS constant

• Total Momentum

• total speed

• total Velocity

• Energy

Tags

NGSS.HS-PS2-2