Post-Test: Unit 3 - Force and Motion

He keeps flying, when the bike stops because of _________.

• Gravity
• Friction
• Inertia
• Velocity

A bus traveling at 60 kmh notices a broken down car on the side of the road.  To be safe the bus slows to 30 kmh in 2 seconds.  What is the acceleration of the bus?

• 10 kmh/s
• 120 kmh/s
• 15 kmh/s
• -15 kmh/s

How much force does a bear weighing 300 Kilograms and moving at 30 m/s generate?

• 9,000 N

• 90 N

• .0009 N

• .09 N

What is Newton's First Law

• F=ma, acceleration is dependent on force applied and mass

• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion-unless a force acts on it
• Friction 

What is Newton's Third Law

• F=ma, acceleration is dependent on force applied and mass

• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion-unless a force acts on it
• Friction 

John is swimming at a speed of 1.6 m/s. He is swimming toward a boat floating on the water 500 m away. How long will it take John to reach the boat?

• 312.5 seconds

• 0.0032 seconds

• 31.25 seconds

• 0.032 seconds

Sean is driving his car at a speed of 25 mph. He arrives at Henderson Middle in 3.5 minutes (0.058 hours). How far away was Sean from Henderson Middle when he began his trip?

• 1.45 miles

• 87.5 miles

• 7.14 miles

• 0.14 miles

Match the following measurements/variables with their units/symbols.

• V_f

• Final Velocity

• ΔV

• Starting Velocity

• V_i

• mass

• Kg

• Force

• N

• Chance in Velocity

Match the following measurements with their units.

• m/s with direction

• time

• m/s

• speed

• m

• velocity

• m/s²

• acceleration

• s

• distance

A bullet travels down the barrel of gun in .001 seconds and leaves the barrel at a speed of 500 m/s. What was the bullet's acceleration? If the bullet has a MASS of .0211kg what was the force that was required to accelerate it? (hint: first solve for acceleration then use the force equation to solve for F)

• a=500,000m/s

  F=105,000N

• a=105,000N

  F=500,000m/s

• a=50,000m/s

  F=10,500N

• a=500,000m/s

  F=105,000,000N