Newton's 2nd 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

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

• 5000 N

• 50 N

• 20,000 N

• 500 N

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

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

• 250 N

• 2.5 N

• 25 N

• 15 N

What unit do we measure force in?

• Kilometer/hr

• Joules

• Seconds

• Newtons

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

Velocity has two components

(pick 2 below)

• direction

• speed

• speeding up

• acceleration

In science, acceleration refers to. . .(pick more than one)

• increasing speed

• decreasing speed

• changing direction

• increasing speed only

Which of the following cars is NOT accelerating?

• A car shortly after a stoplight turns green.

• A car approaching a red light

• A car with the cruise control set at 80 km/h

• A car turning a curve at a constant speed

Which of the following is a unit for acceleration?

• km/s
• m/s²
• mi/hr
• ft