School / IB / PHYSICS SL / Space, time and motion Question practice
Space, time and motion About this practice Kinematics, forces and momentum, work, energy and power.
Physics: Standard Level Space, time and motion
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5 Define linear momentum, and state the principle of conservation of momentum. Easy 2 marks No calculator + 6 Marking analysis: A learner attempts the following task: “Define linear momentum, and state the principle of conservation of momentum.” Their response addresses only this point: “Defines momentum as the product of an object's mass and velocity (p = mv), a vector quantity.” Evaluate the response against the complete 2-mark task. Identify what earns credit and state every additional requirement needed for full marks. Marking analysis Easy 2 marks No calculator + 7 A 0.50 kg ball moving at 8.0 m/s collides head-on with a stationary 1.5 kg ball, and they stick together. Calculate their common velocity after the collision. Easy 3 marks Calculator + 8 Marking analysis: A learner attempts the following task: “A 0.50 kg ball moving at 8.0 m/s collides head-on with a stationary 1.5 kg ball, and they stick together. Calculate their common velocity after the collision.” Their response addresses only this point: “Uses conservation of momentum: total momentum before = total momentum after.” Evaluate the response against the complete 3-mark task. Identify what earns credit and state every additional requirement needed for full marks. Marking analysis Easy 3 marks Calculator + 9 State the work-energy theorem, and use it to explain why a car's braking distance depends on the square of its initial speed. Easy 3 marks No calculator + 10 Marking analysis: A learner attempts the following task: “State the work-energy theorem, and use it to explain why a car's braking distance depends on the square of its initial speed.” Their response addresses only this point: “States that the work done by the resultant force on an object equals its change in kinetic energy.” Evaluate the response against the complete 3-mark task. Identify what earns credit and state every additional requirement needed for full marks. Marking analysis Easy 3 marks No calculator + 15 An object moves in a horizontal circle of radius 0.50 m at a constant speed of 4.0 m/s. Calculate its centripetal acceleration and state the direction of the resultant force causing it. Easy 3 marks Calculator + 16 Marking analysis: A learner attempts the following task: “An object moves in a horizontal circle of radius 0.50 m at a constant speed of 4.0 m/s. Calculate its centripetal acceleration and state the direction of the resultant force causing it.” Their response addresses only this point: “Uses centripetal acceleration a = v²/r.” Evaluate the response against the complete 3-mark task. Identify what earns credit and state every additional requirement needed for full marks. Marking analysis Easy 3 marks Calculator + 17 State Newton's third law of motion, and use it to explain the forces acting when a swimmer pushes against the water to move forward. Easy 3 marks No calculator + 18 Marking analysis: A learner attempts the following task: “State Newton's third law of motion, and use it to explain the forces acting when a swimmer pushes against the water to move forward.” Their response addresses only this point: “States Newton's third law: for every action force, there is an equal and opposite reaction force acting on a different object.” Evaluate the response against the complete 3-mark task. Identify what earns credit and state every additional requirement needed for full marks. Marking analysis Easy 3 marks No calculator + 29 An electric motor is supplied with 400 J of electrical energy and does 260 J of useful work lifting a load against gravity. Calculate the efficiency of the motor, and state one reason why the efficiency is less than 100%. Easy 3 marks Calculator + 30 Marking analysis: A learner attempts the following task: “An electric motor is supplied with 400 J of electrical energy and does 260 J of useful work lifting a load against gravity. Calculate the efficiency of the motor, and state one reason why the efficiency is less than 100%.” Their response addresses only this point: “Uses efficiency = (useful energy output ÷ total energy input) × 100%.” Evaluate the response against the complete 3-mark task. Identify what earns credit and state every additional requirement needed for full marks. Marking analysis Easy 3 marks Calculator + Self-assessed Not marked yet
Set total 110
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