Physics Review - 8th grade

Which two triangles are correct?

• 1 & 4

• 2 & 3

• 2 & 4

• 1 & 2

A runner races in the 100 meter dash.  It takes her 10 seconds to finish.  What is her average speed?

• 10 m/s
• 1000 m/s
• 100 seconds
• 10 seconds

A 0.5 kg football experiences a 16 m/s² acceleration when thrown. What force was applied on the football?

• 32 N

• 8 N

• 15.5 N

• 0.04 N

What is Newton's First Law

• F=ma
• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion. 
• Friction 

When the net force is zero, the forces on an object are balanced. True or false.

• true
• false

What is the net force?

• 40 N left
• 0 N Balalnced
• 400 N right
• 40 N right

Unit for Force

• Newton

• Kilogram

• Meter and Vector for direciton

• Meter/Second²

Why does a book on a table not move?

• No forces are acting on the book
• Gravity is the only force acting on the book
• Forces of the table pushing up and gravity pulling down are balanced