Forces Quiz #4

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

An evil ewok threw a rock with a force of 24.6N and an acceleration of 6m/s² at an innocent stormtrooper. What was the rocks mass?

• 147.6 kg

• 41 kg

• 4.1 kg

• 0.24 kg

A 20 kg bike accelerates at 10 m/s2. What was the force?

• 2 Newtons

• 30 Newtons

• 200 Newtons

• 0.5 Newtons

Jenny applies a 60 N force to a 20 Kg cart, what is the acceleration of the cart if friction can be neglected?

• 1200 m/s/s

• 0.33 m/s/s

• 20 m/s/s

• 3 m/s/s

The mass of a wagon is 40 kg. The wagon accelerates at 8 m/s² . What is the force?

• 38.25 Kg

• 320N

• 5N

• 3.825Kg

You push on a tree with 20 N of force. If the tree doesn't move, the tree is pushing back on you with _____of force.

• 20N

• 10N

• 40N

• 70N

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

• 1kg

• 100 kg

• 5kg

• 2kg

What is the mass of a falling rock if it produces a force of 147 N? (Acceleration due to gravity = 9.8 m/s²)

• 15 kg

• 1,440.6 kg

• 156.8 kg

• 137.2 kg