module 2 forces in action

Module 2 Forces in Action

Forces in Equilibrium

Forces in EquilibriumYou should be able to:• draw and use a triangle of forces to represent the equilibrium of three forces acting at a point in an object.• analyse unfamiliar situations so that you can

draw a vector triangle.• resolve force vectors into horizontal and

vertical components.

Forces in EquilibriumResolving Forces Vertically & Horizontally

What are the horizontal and vertical components of these forces ( scale – one square = 1 Newton )

Forces in EquilibriumResolving Forces Vertically & Horizontally

Forces in EquilibriumResolving Forces Vertically & Horizontally

Forces in EquilibriumResolving Forces Vertically & Horizontally

Forces in EquilibriumResolving Forces Vertically & Horizontally

When is the weight most difficult to support and why?

Forces in Equilibrium

The Triangle of Forces

Forces in Equilibrium

The Triangle of Forces

Forces in Equilibrium

The Triangle of Forces

Weight F2 F1 θ

W

N

F

Forces in EquilibriumObject on a Slope

Forces in Equilibrium

Forces in Equilibrium

Forces in Equilibrium

Forces in Equilibrium

Forces in Equilibrium

3.4 N

N

F

Calculate (a) the normal reaction, N, and (b) the horizontal force, F.

Forces in Equilibrium

(a) The total mass of the performer plus props is 76.5 kg. Using a scale of 1 cm to 100 N, draw a vector triangle to show the forces acting on the performer.(b) Use your diagram to find the tensions T1 and T2 in the cable.(c) A member of the audience is worried that the cable might break, and thinks that this would be less likely to happen if the cable were shorter so that it did not sag so much.Explain, with the aid of a diagram, whether this would really reduce the tension in the cable.

Centre of Gravity

• Define the centre of gravity of an object.

• Describe a simple experiment to determine the centre of gravity of an object.

Centre of Gravity

Centre of Gravity

• Define the centre of gravity of an object.

• Describe a simple experiment to determine the centre of gravity of an object.