Unit 1 Test_PSI 101

Which of the following quantities is a scalar?

• Energy

• Force

• Velocity

• Momentum

Which of the following are vector quantities?

• Force

• Energy

• Acceleration

• Speed

Place the following stages of an object falling through the atmosphere in order:

• Object is in free fall

• Net force becomes zero

• Air resistance builds

• Object moves at a constant velocity downwards

Tags

NGSS.HS-PS2-1

As we learned in class,​ (a)   is how strong a gravitational pull is whereas​ (b)   is counting how many bits of stuff is in an object. We measure the latter in​ (c)   and it reflects the object's total​ (d)   .

• weight
• mass
• kilograms
• inertia
• force
• pressure
• density
• meters
• volume
• pounds

A ball is thrown horizontally from the top of a cliff. What shape does its path follow as it falls?

• A straight vertical line

• A straight diagonal line

• A parabolic curve

• A circular arc

Tags

NGSS.MS-PS2-4

Two objects of different masses are dropped from the same height at the same time (neglecting air resistance). What happens?

• The heavier one falls faster

• The lighter one falls slower

• Both hit the ground at the same time

• The lighter one floats

Tags

NGSS.MS-PS2-4

Two balls are released at the same time—one dropped straight down, the other launched horizontally. Which hits the ground first (neglecting air resistance)?

• The dropped ball

• The launched ball

• Both at the same time

• The one with more mass

What physical quantity measures how difficult it is to change an object's velocity?

• Energy

• Force

• Inertia

• Work

What does an object's mass tell us?

• Its size in space

• Its thermal energy

• How many bits of stuff it contains

• How quickly it moves

What happens to an object in motion if no external forces act on it?

• It eventually stops

• It moves at constant speed in a straight line

• It speeds up

• It changes direction randomly