Forces

• What are the 9 kinds of forces?

  Friction, air resistance, push, pull, electrostatic, weight, upthrust, magnetic, reaction force
• What happens to an object when balanced forces act on it?

  It will move at a constant speed or remain stationary
• What is the effect of unbalanced forces on an object?

  They will cause the object to accelerate or decelerate
• Name some scalar quantities.

  Temperature, speed, mass, energy, distance, density
• Name some vector quantities.

  Force, momentum, displacement, velocity
• What does Hooke's law state?

  Force is directly proportional to extension
• What is elastic deformation?

  Material returns to its original shape after the force is removed
• What is inelastic deformation?

  Material does not return to its original shape after the force is removed
• What does Newton's 2nd Law state?

  The acceleration of an object is directly proportional to the force acting on it
• What does Newton's 3rd Law state?

  Whenever two objects interact, the forces they exert on each other are equal and opposite
• Distance is a scalar quantity because it contains magnitude (size, like 5m) but no direction (u can travel is any and all directions yet it doesn’t effect ur distance, it still measures)