| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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Newton's Second Law:
The acceleration of an object is proportional to the resultant force acting on the object, and inversely proportional to the mass of the object. |
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What is Newton's second law? |
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Students should be able to estimate the speed, accelerations and forces involved in large accelerations for everyday road transport. |
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What is the typical mass of a cyslist, car and lorry? mix and match activity with sizes |
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Momentum is defined by the equation:
momentum = mass ? velocity
p = m v
momentum, p, in kilograms metre per second, kg m/s
mass, m, in kilograms, kg
velocity, v, in metres per second, m/s |
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what is the momentum equation and units? Demo:
Use the air track to show the effects of momentum when:
- moving object hitting a stationary one
- moving with same speed towards each other
- both moving at the same direction with same speed
- both moving in the same one going faster than the other.
GF: Discuss the changes in momentum that occur when particles collide during a chemical reaction. You should refer to activation energy in your answer. |
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Students should be able to complete calculations involving an event, such as the collision of two objects. |
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two model cars collide reversing into one another), the blue car has a of mass 1.2Kg and the red car has a mass of 1.4 kg they collide at speeds of 0.5m/s (blue) and 0.2m/s (red) what is the velocity of the cars after the collision? |
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When a force acts on an object that is moving, or able to move, a change in momentum occurs.
The equations F = m × a and a = ( v − u ) / t
combine to give the equation F = m Δ v / Δ t
where mΔv = change in momentum
ie force equals the rate of change of momentum. |
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The equations F = m × a and a = ( v - u ) / t combine to give what equation? |
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(HT only) Students should be able to explain that inertial mass is defined as the ratio of force over acceleration. |
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(HT only) What is the definition of inertial mass? |
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In a closed system, the total momentum before an event is equal to the total momentum after the event. This is called conservation of momentum. |
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What is conservation of momentum? EW: Ice skater or skate boarder exam question to explain concept of conservation of momentum
Q1 - level 2
Q2 - level 3
http://EIGUIYC.exampro.net |
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Students should be able to explain safety features such as: air bags, seat belts, gymnasium crash mats, cycle helmets and cushioned surfaces for playgrounds with reference to the concept of rate of change of momentum. |
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In terms of rate of change of momentum, how do different examples of safety features work? |
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Students should be able to apply equations relating force, mass, velocity and acceleration to explain how the changes involved are inter-related. (MS) |
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Students should recognise and be able to use the symbol that indicates an approximate value or approximate answer ~ |
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What is the symbol that indicates an approximate value or approximate answer? |
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Students should be able to use the concept of momentum as a model to describe and explain examples of momentum in an event, such as a collision |
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Explain what happens to momentum in a collision? |
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(HT only) Students should be able to explain that inertial mass is a measure of how difficult it is to change the
velocity of an object |
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What is inertial mass a measure of? |
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(HT only) The tendency of objects to continue in their state of rest or of uniform motion is called inertia. |
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(HT only) What is the definition of inertia? |
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