Newton's Second Law

What is Newton's 2nd Law?

• Every action has an equal and opposite reaction

• An object at rest stays at rest, an object in motion stays in motion.

• F = ma

• Friction

If the man pushes with an equal amount of force, which object will accelerate more?

• Car because it has more mass

• Lawnmower because it has less mass

• Car because it has less mass

• Lawnmower because it has more mass

What unit do we measure force in?

• Kilometer/hr

• Joules

• Seconds

• Newtons

The larger the mass you have the _____ force you need to change its motion.

• more
• less

Your car has a mass of 2500 kg and a force of 5000 N. How fast will it accelerate?

• 20 m/s²

• 0.5 m/s²

• 2 m/s²

• 120 N

Find how much force the man will need to exert to move the car.

• 5000 N

• 50 N

• 20,000 N

• 500 N

A 25 kg bike accelerates at 10 m/s². What was the force?

• 250 N

• 2.5 N

• 25 N

• 15 N

If an object was accelerating at 5 m/s², and a force of 10 newtons was required to accelerate it, what was the object's mass?

• 50 kg

• 2 kg

• 0.5 kg

• 5 kg

True or False. 800 N = 800 kg ⋅ m/s²

• True

• False

When mass is 10 kg, acceleration is 2 m/s/s, what is force?
F = ma

• 5 N
• 20 N
• 8 N
• 12 N