1cForces, movement, shape and momentum

Syllabus objectives

• 1.11describe the effects of forces between bodies such as changes in speed, shape or direction
• 1.12identify different types of force such as gravitational or electrostatic
• 1.13understand how vector quantities differ from scalar quantities
• 1.14understand that force is a vector quantity
• 1.15calculate the resultant force of forces that act along a line
• 1.16know that friction is a force that opposes motion
• 1.17know and use the relationship between unbalanced force, mass and acceleration: force = mass × acceleration F = m × a
• 1.18know and use the relationship between weight, mass and gravitational field strength: weight = mass × gravitational field strength W = m × g
• 1.19know that the stopping distance of a vehicle is made up of the sum of the thinking distance and the braking distance
• 1.20describe the factors affecting vehicle stopping distance, including speed, mass, road condition and reaction time
• 1.21describe the forces acting on falling objects (and explain why falling objects reach a terminal velocity)
• 1.22practical: investigate how extension varies with applied force for helical springs, metal wires and rubber bandsPractical
• 1.23know that the initial linear region of a force-extension graph is associated with Hooke’s law
• 1.24describe elastic behaviour as the ability of a material to recover its original shape after the forces causing deformation have been removed
• 1.25know and use the relationship between momentum, mass and velocity: momentum = mass × velocity p = m × vSeparate Physics only
• 1.26use the idea of momentum to explain safety featuresSeparate Physics only
• 1.27use the conservation of momentum to calculate the mass, velocity or momentum of objectsSeparate Physics only
• 1.28use the relationship between force, change in momentum and time taken: change in momentumforce time taken= t mumvF )( −=Separate Physics only
• 1.29demonstrate an understanding of Newton’s third lawSeparate Physics only
• 1.30know and use the relationship between the moment of a force and its perpendicular distance from the pivot: moment = force × perpendicular distance from the pivotSeparate Physics only
• 1.31know that the weight of a body acts through its centre of gravitySeparate Physics only
• 1.32use the principle of moments for a simple system of parallel forces acting in one planeSeparate Physics only
• 1.33understand how the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beamSeparate Physics only