Physics - newton's laws (type 2)

Review of newton's laws

Newton’s first law

An object in motion stays in motion and an object at rest stays at rest unless acted on by an unbalanced force

Newton’s second law

F = ma

Newton’s third law

For every action, there is an equal but opposite reaction

Inertia define it

Inertia is the tendency of all objects to resist any change in motion.

Acceleration

change in velocity over time

Would it be harder or easier to move a heavier object

Harder (more mass, less acceleration for same force)

Which has more inertia? 1 quarter or 4?

4 - more mass = more inertia

If the force you apply to an object is the same, then the acceleration of an object DECREASES as the mass of the object ______________.

Increases. Objects with heavier mass will accelerate less

Is acceleration and force directly related or inversely related?

Directly related. As one goes up, the other goes up. As one goes down, the other goes down.

As mass (increases/decreases), acceleration increases.

decreases. Mass and acceleration have an inverse relationship. The more mass an object has, the less it will accelerate.

A car is moving at a constant velocity on a straight road. What force is acting on the car?

no net force (since no acceleration)

If the mass of an object increases, what happens to its acceleration when a constant force is applied?

Acceleration decreases

If the force applied to an object increases, what happens to its acceleration?

acceleration increases

If the mass of an object remains constant, but its velocity increases, what happens to its kinetic energy?

KE increases

If the force applied to an object is doubled, and its mass remains constant, what happens to its acceleration?

acceleration doubles

If the velocity of an object is doubled, and its mass remains constant, what happens to its kinetic energy?

Kinetic energy quadruples

If the mass of an object is tripled, and the force applied to it remains constant, what happens to its acceleration?

Its acceleration is reduced to one-third of its original value

If the force applied to an object is reduced to half its original value, and its mass remains constant, what happens to its acceleration?

Its acceleration is reduced to half its original value

If the mass of an object is reduced to half its original value, and the force applied to it remains constant, what happens to its acceleration?

acceleration doubles