Physical Science Second Semester Exam Review (NO waves)

If you were standing next to the barn, what object would appear to be moving?

• The water tower
• The plane
• The barn
• None would appear to be moving.

A person jogs 3 miles, leaving her porch at 11 AM, then returns to her porch at 12 PM. What is her displacement? _____ miles

• 0 miles
• 3 miles
• 6 miles
• It's not possible to determine

When the distance something travels is divided by the time it takes. What is being calculated?

• Acceleration
• Speed
• Velocity
• Displacement

When the speed of an object slows down, the acceleration is _________________.

• Negative
• Positive
• Unchanged
• Variable

Acceleration is the change in _____.

• Speed
• Velocity
• Speed and Velocity
• Frame of Reference

What is the difference between speed and velocity (the science definitions!)?

• velocity has direction
• speed has direction
• velocity has units of m/s2
• Nothing. They are exactly the same.

Constant speed is:

• When the speed increases or decreases
• When the speed of the object does not change

What is the difference between instantaneous speed and average speed?

• Average speed happens in a particular instant, Instantaneous speed is the speed of an object over a longer period of time.
• Instantaneous speed is never right, average speed is always right
• Instantaneous speed happens in a particular instant, Average speed is the speed of an object over a longer period of time.

Relative motion

• the motion of an object in comparison to other objects in a specific frame of reference
• the point of view used to measure the position and movement of objects
• how fast something moves
• the distance

A textbook is dropped from a second floor window and falls to the ground. What happens to the velocity as the book falls to the ground

• the velocity remain constant
• the velocity decreases
• the velocity increases