Physical Science 2021 Midterm

When one object exerts a force on a second object, that second object exerts a force that is equal in magnitude and opposite in direction.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• Newton's 4th Law

Vector quantities need __________________.

• Magnitude

• Direction

• Neither magnitude nor direction

• Both magnitude and direction

What is Newton's First Law saying?

• Objects in space move randomly.
• Object won't move unless pushed or pulled.
• Object at rest will always move.
• Balanced forces cause objects to move.

According the Newton's Second Law, what factors affect force?

• speed and power
• shape and material
• mass and acceleration
• mass and weight

You walk 10 meters to math class in 20 seconds. Your average speed is

• 2 m/s
• 0.5 m/s
• 200 m/s
• 5 m/s

When something has speed in a certain direction it is called ___________.

• motion
• position
• velocity
• speed

What is the net force?

• 30 N 
• 25 N 
• 5 N 
• 55 N 

A horse accelerates from a velocity of 0m/s to 20 m/s in 3 seconds. What is the acceleration of the horse?

• 60 m/s²

• 6.67 m/s²

• 0.15 m/s²

• 30 m/s²

speed

• distance traveled per unit of time

• a change in the position of an object compared to another object (related term: move, movement)

• measured period during which something occurs

• a change in the velocity (speed, direction, or both) of a body (related word: accelerate)

Displacement is

• position of object

• final position minus initial position

• distance divided by time

• initial position plus final position