A vehicle is at rest on a slope. It is considered to have three forces acting on it to keep it in equilibrium. They are its weight $$$W$$$, a normal reaction force $$$R$$$ and a frictional force $$$F$$$. Which triangle of forces is correct?

Physics

IGCSE&ALevel

CAIE

Exam No：9702_s13_qp_12 Year：2013 Question No：12

Answer:

Knowledge points:

4.1.1 define and apply the moment of a force

4.1.2 understand that a couple is a pair of forces that tends to produce rotation only

4.1.3 define and apply the torque of a couple

4.4 pending

5.1.1 describe the force on a mass in a uniform gravitational field and on a charge in a uniform electric field

5.1.2 understand the origin of the upthrust acting on a body in a fluid

5.1.3 show a qualitative understanding of frictional forces and viscous forces including air resistance (no treatment of the coefficients of friction and viscosity is required)

5.1.4 understand that the weight of a body may be taken as acting at a single point known as its centre of gravity

5.3.1 state and apply the principle of moments

5.3.2 understand that, when there is no resultant force and no resultant torque, a system is in equilibrium

5.3.3 use a vector triangle to represent coplanar forces in equilibrium

5.4.1 define and use density

5.4.2 define and use pressure

5.4.3 derive, from the definitions of pressure and density, the equation Δp = ρgDh

A vehicle is at rest on a slope. It is considered to have three forces acting on it to keep it in equilibrium. They are its weight $$\(W\)$$, a normal reaction force $$\(R\)$$ and a frictional force $$\(F\)$$. Which triangle of forces is correct?

Answer:

Knowledge points:

Solution:

A vehicle is at rest on a slope. It is considered to have three forces acting on it to keep it in equilibrium. They are its weight $$\(W\)$$, a normal reaction force $$\(R\)$$ and a frictional force $$\(F\)$$. Which triangle of forces is correct?

Answer:

Knowledge points:

Solution:

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