Motion, Force, and Newton's Law

What is newtons 1st law?

• an object will not change its motion unless a force acts on it.

• the force on an object is equal to its mass times its acceleration.

• when two objects interact, they apply forces to each other of equal magnitude and opposite

• the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

What is the equation for the 2nd Newton's Law.

• F = m - a

• F = ma

• F = m/a

• F = m + a

Define Newton's 3rd Law.

• ‘An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force

• for every action (force) there is an equal and opposite reaction” now onto the example

• defines a force to be equal to change in momentum (mass times velocity) per change in time

A push or pull that causes a change in motion

• Force

• Gravity

• Inertia

• Friction

The amount of matter in an object

• force

• weight

• mass

• gravity

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

• The cannon moving forward

• the cannon moving backwards

• the cannonball moving backwards

• The cannonball moving forward

What unit do we measure force in?

• Kilometer/hr

• Joules

• Seconds

• Newtons

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

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

"An object in motion (or at rest) will to stay in motion (or at rest) until an outside force acts upon it."

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• Newton's 4th Law