FORCES AND NEWTONS LAWS OF MOTION NOTES

What is Newton’s first law?

Every object continues in a state of rest or uniform motion in a straight line unless acted on by a resultant external force

Name 4 external forces

• Air resistance

• Friction

• Pushing/pulling it

• Driving force

What is Newton’s second law?

Resultant force = mass x acceleration

F=ma

What is Newton’s third law?

When one object A exerts a force on another object B, then object B exerts an equal and opposite force on object A

What does the following terms mean?

• Particle

• Light

• Inextensible

• Smooth

• Ignore the size - no air resistance

• Ignore the weight

• Ignore stretch - fixed length

• Ignore friction - ice like

Explain the following types of force:

• Weight

• Resistance

• Reaction

• Friction

• Driving force

• Braking force

• Tension

• Thrust

• Equilibrium

• Weight = mass x gravity (10m/s²)

• Resistance = always opposing motion

• Reaction = always perpendicular to surface

• Friction = builds up as forces of motion increase

• Driving force = from an engine

• Braking force = in a car, putting the brakes on

• Tension = in a string (pulling force)

• Thrust = in a rod (pushing force)

• Equilibrium = means that forces are balanced

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