Newton's Laws of Motion

What is Newton’s first law?

Objects will remain at rest or move with a constant velocity unless acted upon by a resultant force.

What does Newton’s first law mean?

A stationary object will remain stationary and a constant moving object will continue to move unless acted on by a resultant force.

What does Newton’s first law explain?

Why things move with constant velocity because if forces are balanced then resultant force is zero.

What is Newton’s Second Law?

The acceleration of an object is proportional to the resultant force acting on it and inversely proportional to the object’s mass.

What does Newton’s Second Law explain?

An object will accelerate as a response to a resultant force, the larger the force the larger the acceleration so for a given force the greater the object’s mass the smaller the acceleration.

What is the method for the investigating force and acceleration RQP?

1. Use a metre ruler to measure 20cm intervals.

2. Attach a bench pulley to the end of the bench, tie string to a toy car and pass the string over the pulley and attach a mass hanger to the end.

3. Hold car at a set start point and attach the full set of masses.

4. Release the car stopwatch, lapping it at each interval.

5. Repeat to create an average time for each interval

6. Repeat with decreasing masses on the hanger.

What does constant velocity mean that?

Resultant force is 0.

What is Newton’s first law also called?

The inertia law

What is acceleration if a car is at max speed?

0

What is Newton’s Third Law?

Whenever two bodies interact the forces they exert on each other are both equal and opposite.

What is the difference between Newton’s third law and the other two?

The third law is about two different objects interacting whereas the others are about single objects.

What does Newton’s Third Law explain?

When two forces interact the forces occur in pairs, and the pairs are of the same type of force explaining the force that allows someone to walk.

How does Newton’s Third Law explain walking?

The foot and the ground are the two different interacting objects, the foot exerts a push force on the ground and the ground exerts a push force on the foot which is equal in magnitude but opposite in direction.

What is intertia?

The tendency of an object to continue in its state of rest or in uniform motion unless acted upon by an external force.

What does inertia mean?

An object’s resistance to a change in motion, if at rest it will remain at rest or remain at constant velocity.

What is the relationship between acceleration and inertial mass?

Inversely proportional, larger inertial masses are harder to accelerate.