Course

AS Physics: Measurement and Motion (9702)

Name: AS Physics: Measurement and Motion (9702)
Price: 1799 BDT

9702 topics 1 and 2. Units, uncertainty and vectors, then motion read off a graph: the two topics every later paper quietly assumes you already own.

32 lessons3h 44mEnglish

What you'll learn

Check an equation for homogeneity, and use that check to catch your own algebra
Combine uncertainties through a calculation instead of quoting the largest one
Resolve a vector and add vectors, including the relative-velocity case
Read a gradient and an area off a motion graph, and say what each one means physically
Solve a projectile by treating the two directions separately, which is where most marks are lost

Requirements

Able to rearrange an equation with several symbols in it
Comfortable with standard form, prefixes and significant figures
Basic trigonometry: sine and cosine of an angle in a right triangle
O Level Physics speed, distance and time is helpful but is re-derived here

Course content

32 lessons · 3h 44m

1.1-1.4 · Physical quantities and units

Tell a vector from a scalar, add vectors that are not in a line, and split one into components. Every later chapter assumes this without saying so.

0/12

Base quantities and SI units

Seven base quantities, six of them on 9702, and why nothing smaller will do.

Preview7m 2.

Derived units

The newton, joule, watt and pascal, each built from its defining equation.

Preview8m

Prefixes and standard form

Pico to giga, and why cubing a centimetre does not just cube the number.

Checking an equation for homogeneity

Reduce every term to base units, then find the trick this test can never catch.

Precision, accuracy and the two kinds of error

A systematic error survives averaging. A random error does not.

Combining uncertainties

Add absolute errors for a sum, percentage errors for a product, and derive why.

Vector or scalar?

Two quantities can be the same size and still behave differently.

Preview5m 8.

Adding vectors that are not in a line

Drag two arrows until their resultant hits the target.

Preview7m

Splitting a vector into components

One arrow, two perpendicular parts, and the reason exam questions start here.

10.

Velocity depends on who is watching

Rain falls straight down, until you drive through it.

11.

One exam question, end to end

Eight marks, four parts, no options: a resultant, a direction, a component, then one explanation.

12.

Paper 1 practice: physical quantities and units

Original 9702-style Paper 1 practice: eight multiple-choice questions, one mark each, no working shown.

2.1 · Kinematics

Describe motion the way the exam asks for it. Displacement against distance, gradients and areas on the two graphs, the four constant-acceleration equations, free fall, and a projectile solved as two independent motions.

0/18

Distance is the path, displacement is the gap

Two legs of a walk: 7 km covered, 5 km from the start. Both answers are honest.

Preview5m 2.

Average speed hides the journey

One emergency stop, and an average speed the bus never actually held.

Preview5m

Acceleration is about velocity, not speed

A car at a steady 30 km/h round a roundabout is accelerating. Here is why.

The gradient of a displacement-time graph

Velocity at an instant is the gradient of a tangent, never the height of the point.

The gradient of a velocity-time graph

The gradient is the acceleration, and a curve warns you which equations you may not use.

The area under a velocity-time graph

A ball thrown up and caught again: the area above cancels the area below, so displacement is zero.

Choosing a SUVAT equation

Five quantities, three given: pick the equation that leaves out the one you never meet.

Why braking distance grows with the square of speed

Double the speed. Thinking distance doubles. Braking distance becomes four times as large.

Free fall: the mass cancels

A hammer and a feather in a vacuum land together, and the algebra says they must.

10.

Two motions that ignore each other

Separate across-river and downstream motion, then use one shared time to predict the landing point.

Preview8m

11.

Aim upstream to land opposite

Spend part of the launch speed cancelling the current, then find when landing opposite becomes impossible.

12.

Fired straight up from a moving cart

The ball lands back in the cart: gravity never touches the horizontal motion. Then one ball dropped and one thrown, landing together.

14m

13.

Working a projectile: the time comes from the vertical

The worked exam question for this chapter: a ball thrown horizontally off a 20 m cliff.

14.

Aim straight at the falling target

The monkey and the hunter as a game: both fall ½gt² below their straight paths, so aiming straight at a dropping coconut hits it.

11m

15.

Catch-up on one road: work in the gap

A bus 60 m ahead and a faster car behind it. The gap is the only thing that goes to zero, and it closes at the difference of the speeds.

16.

Beyond the syllabus: catching something that moves

For BUET and HSC candidates: a tiger leading a deer, where the relative velocity must point along the line of sight.

11m

17.

One exam question, end to end

Ten marks, four parts, no options: components, flight time, range, then why u_x never changes.

18.

Paper 1 practice: kinematics

Original 9702-style Paper 1 practice: eight multiple-choice questions, one mark each, no working shown.

About the creator

8bitlesson

Cambridge O Level, A Level and university courses, taught through interactive labs.

Mentora builds the sciences and mathematics as things you can move rather than videos you watch. Cambridge O Level and A Level mathematics, physics, chemistry and accounting, a primary mathematics track, and first-year university computer science. Every lesson works a real exam question end to end.