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Mechanics: lesson checks flashcards

This deck has 9 check-yourself questions and 6 spot-the-error cards. The misconception each lesson corrects, and its check-yourself question with the worked answer. Rate each answer, and the card comes back sooner or later depending on how you rated it.

Years 12–13 · all 584 maths cards

How the five kinds differ

Standard results ask you to recall a formula or a value. Definitions ask you to state a mathematical term precisely. Recall prompts ask for a rule, condition or method. Check yourself cards are a short question with its answer. Spot the error cards ask you to correct a statement that is wrong.

Every card in this deck

Choose any card to try it in the player above. Each card links to the lesson that teaches it.

• A negative velocity means the object is slowing down.Spot the error
• A load hangs from a crane by a steel cable. The cable is modelled as a light inextensible string. State what each of the two words contributes to the model.Check
• A stone is dropped from rest down a well and hits the water after 2 s. Taking g = 9.8 m s⁻², find the depth and the speed at impact.Check
• If a particle's velocity is zero at some instant, its acceleration is zero then too.Spot the error
• A particle starts from rest and has a = 12t − 6. Find v(t), and the time after t = 0 at which it is next at rest.Check
• A 1200 kg car accelerates at 2.5 m s⁻² against a total resistance of 600 N. Find the driving force.Check
• The tension on the heavy side of a pulley is larger than on the light side.Spot the error
• Masses of 7 kg and 3 kg hang over a smooth pulley. Write the two equations of motion and find the acceleration in terms of g.Check
• A projectile's horizontal speed gradually decreases during flight.Spot the error
• A stone is thrown horizontally at 15 m s⁻¹ from a 19.6 m cliff. How long does it fall, and how far from the cliff base does it land?Check
• A 4 kg box rests on a rough horizontal floor, μ = 0.5. A horizontal force of 15 N is applied. Show the box does not move, and state the friction force acting.Check
• If a particle is in equilibrium, there are no forces acting on it.Spot the error
• A particle of weight 20 N on a smooth slope inclined at 30° is held by a string parallel to the slope. Find the tension and the normal reaction.Check
• A bigger force always has a bigger turning effect.Spot the error
• A uniform 4 m plank of weight 80 N rests on a support at its centre. A child of weight 400 N sits 0.5 m from one end. How far from the centre, on the other side, must a 500 N adult sit to balance it?Check

The lessons these cards come from

• Connected particles and pulleys
• Forces and Newton's laws
• Friction and inclined planes
• Kinematics with constant acceleration
• Kinematics with variable acceleration
• Modelling, quantities and units
• Moments
• Projectiles
• Statics of a particle

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