AL MAWAKEB AL KHAWANEEJ

Final Exam
Revision Session

Grade 12 Physics — 2025–2026
June 2, 2026
Have ready: paper, pen, calculator, formula sheet.
Work through each problem step by step.
Take your time — there is no rush.
AMK PHYSICS Your Exam on Tuesday
Topic Points
Newton's 2nd Law & Forces 24
Work & Energy 30
Momentum & Impulse 46

Momentum is almost half your exam. We start there.

AMK PHYSICS What Your Exam Looks Like
Part Points
Part I — Multiple Choice (15 questions) 30
Part II — True / False (10 questions) 20
Part III — Problem Solving (7 questions) 50
Bonus 3

Problem solving has step-by-step boxes — fill in each step.
Pick only ONE answer per MCQ and T/F — two answers = zero.

AMK PHYSICS Block 1 of 3
Block 1

Newton's 2nd Law
& Forces

24 points — 2 practice problems
AMK PHYSICS Forces — Round 1
Round 1 Step-by-step 2 min
A 6 kg block is pushed by a horizontal force of 18 N on a frictionless surface.

Find the acceleration.
Steps to follow
Step 1: Write down m = ? and Fnet = ?
Step 2: Write the formula: a = Fnet / m
Step 3: Plug in the numbers
Step 4: Calculate
Solution — Step by Step
Step 1: m = 6 kg,   Fnet = 18 N
Step 2: a = Fnet / m
Step 3: a = 18 / 6
Step 4: a = 3 m/s²
Remember
The formula is Fnet = m × a.
To find a, rearrange: a = Fnet / m (divide force by mass).
AMK PHYSICS Forces — Round 2
Round 2 Step-by-step 2 min
A 5 kg box rests on a flat horizontal floor.
No other vertical forces act on it. Use g = 10 m/s².

Find the weight Fg and the normal force Fn.
Steps to follow
Step 1: Write down m = ? and g = ?
Step 2: Fg = m × g → plug in
Step 3: On a flat surface with no extra force: Fn = Fg
Solution — Step by Step
Step 1: m = 5 kg,   g = 10 m/s²
Step 2: Fg = m × g = 5 × 10 = 50 N
Step 3: Fn = Fg = 50 N
Remember
On a flat surface with nothing else pushing down or pulling up:
Fn = Fg — they are equal. The box is in equilibrium (Fnet = 0).
AMK PHYSICS Forces — Quick Check
Quick Check
Which one is Newton's second law?

a) Fnet = m + a
b) Fnet = m × a
c) Fnet = m / a
b) Fnet = m × a

Force equals mass times acceleration.
Not plus, not divided by — times.
AMK PHYSICS Block 2 of 3
Block 2

Work & Energy

30 points — 3 practice problems
AMK PHYSICS Energy — Round 3
Round 3 Step-by-step 2 min
A worker pushes a box 8 m using a horizontal force of 15 N parallel to the motion.

Find the work done by the worker.
Steps to follow
Step 1: Write down F = ? and d = ?
Step 2: W = F × d → plug in
Step 3: Calculate and write the unit (J)
Solution — Step by Step
Step 1: F = 15 N,   d = 8 m
Step 2: W = F × d = 15 × 8
Step 3: W = 120 J
Remember
Work = Force × distance. The unit is joules (J).
Work is zero when the force is at 90° to the motion.
AMK PHYSICS Energy — Round 4
Round 4 Step-by-step 2 min
A 4 kg ball is moving at 5 m/s.

Find its kinetic energy KE.
Steps to follow
Step 1: Write down m = ? and v = ?
Step 2: Square the velocity: v² = ?
Step 3: KE = ½ × m × v² → plug in
Step 4: Calculate
Solution — Step by Step
Step 1: m = 4 kg,   v = 5 m/s
Step 2: v² = 5 × 5 = 25 m²/s²
Step 3: KE = ½ × 4 × 25
Step 4: KE = 50 J
Watch out!
Square the velocity FIRST, then multiply.
½ × 4 × 5 = 10 is WRONG. You must do v² = 25 first!
AMK PHYSICS Energy — Round 5
Round 5 Step-by-step 2 min
A ball has KE = 30 J and PEg = 20 J.

What is its mechanical energy ME?
Steps to follow
Step 1: Write the formula: ME = KE + PEg
Step 2: Plug in the values
Step 3: Calculate
Solution — Step by Step
Step 1: ME = KE + PEg
Step 2: ME = 30 + 20
Step 3: ME = 50 J
This is on your exam TWICE
ME = KE + PEg — it is PLUS, not minus.
This shows up as an MCQ and a True/False question. Free marks!
AMK PHYSICS Energy — Quick Check
Quick Check
True or False:

"Mechanical energy is ME = KE − PEg"
FALSE

ME = KE + PEg  (PLUS, not minus)
Don't lose this mark — it's a free point.
AMK PHYSICS Block 3 of 3
Block 3

Momentum, Impulse
& Conservation

46 points — 4 practice problems
AMK PHYSICS Momentum — Round 6
Round 6 Step-by-step 2 min
A 5 kg cart moves to the right at +6 m/s.

Find the momentum p of the cart. (Take right as positive.)
Steps to follow
Step 1: Write down m = ? and v = ? (include the + sign!)
Step 2: p = m × v → plug in
Step 3: Write the answer with the sign and direction
Solution — Step by Step
Step 1: m = 5 kg,   v = +6 m/s
Step 2: p = m × v = 5 × (+6)
Step 3: p = +30 kg·m/s  (to the right)
Remember
Momentum has a direction — always include the + or − sign.
The unit is kg·m/s.
AMK PHYSICS Momentum — Round 7
Round 7 Step-by-step 2 min
A constant force of 8 N acts on an object for Δt = 3 s.

Find the impulse J.
Steps to follow
Step 1: Write down F = ? and Δt = ?
Step 2: J = F × Δt → plug in
Step 3: Write the answer with the unit (N·s)
Solution — Step by Step
Step 1: F = 8 N,   Δt = 3 s
Step 2: J = F × Δt = 8 × 3
Step 3: J = 24 N·s
Key fact
Impulse = change in momentum. They are the same thing.
J = Δp = F × Δt
The unit N·s and kg·m/s are the same unit.
AMK PHYSICS Momentum — Round 8
Round 8 Step-by-step 3 min
A 6 kg cart and a 3 kg cart are at rest on a frictionless surface.
They push each other apart.
After the push, the 6 kg cart moves to the left at −2 m/s.

Find the velocity of the 3 kg cart.
Steps to follow
Step 1: Write m₁, m₂, and v₁f
Step 2: Both were at rest → total initial momentum = 0
Step 3: 0 = m₁ × v₁f + m₂ × v₂f → plug in what you know
Step 4: Solve for v₂f
Solution — Step by Step
Step 1: m₁ = 6 kg, m₂ = 3 kg, v₁f = −2 m/s
Step 2: Both at rest → total initial momentum = 0
Step 3: 0 = (6)(−2) + (3)(v₂f)
           0 = −12 + 3 · v₂f
Step 4: 3 · v₂f = 12 → v₂f = +4 m/s  (to the right)
Key pattern
Recoil from rest → the equation always starts with 0 = ...
The two carts move in opposite directions — one is + and the other is −.
AMK PHYSICS Momentum — Quick Checks
Quick Check
True or False:

"Momentum is a scalar quantity."
FALSE

Momentum is a vector — it has magnitude AND direction.
That's why we always write the + or − sign.
AMK PHYSICS Momentum — Quick Check 2
Quick Check
True or False:

"Two skaters at rest push each other apart.
Their total momentum after the push is greater than zero."
FALSE

They started at rest → total momentum = 0
Momentum is conserved → total momentum after = still 0
(One goes + and one goes −, they cancel out)
AMK PHYSICS Momentum — Quick Check 3
Quick Check
If the contact time Δt increases
but the impulse J stays the same,

what happens to the force F?

a) increases    b) stays the same    c) decreases
c) decreases

J = F × Δt → if Δt goes up and J stays the same,
then F must go down.

Think: catching an egg gently (long Δt) = less force.
AMK PHYSICS Final Review
Before the Exam

The 8 Things
You Must Know

Screenshot this next slide
AMK PHYSICS Screenshot This
  1. 1 Fnet = m × a — to find a, divide force by mass
  2. 2 On a flat surface: Fn = Fg = m × g
  3. 3 Work W = F × d — zero work when force is at 90°
  4. 4 KE = ½mv² — square the velocity first, then multiply
  5. 5 ME = KE + PEg — PLUS, not minus
  6. 6 Momentum p = m × v — it is a vector, not scalar
  7. 7 J = Δp = F × Δt — impulse and change in momentum are the same
  8. 8 Recoil from rest → start with 0 = m₁v₁ + m₂v₂
AMK PHYSICS Formula Sheet

Forces & Motion

Fnet = m × a
Fg = m × g
Fn = Fg = m × g
Equilibrium: Fnet = 0

Work

W = F × d
W = 0  (force at 90°)

Energy

KE = ½ m v²
PEg = m × g × h
ME = KE + PEg

Momentum & Impulse

p = m × v
J = Δp = F × Δt

Conservation of Momentum

m₁v₁i + m₂v₂i = m₁v₁f + m₂v₂f  (general)
m₁v₁i + m₂v₂i = (m₁ + m₂) × Vf  (stick together)
0 = m₁v₁f + m₂v₂f  (push apart from rest)

AMK PHYSICS

You Can Do This

Your exam has step-by-step boxes.
Fill in each step — one at a time.

Step 1 is always: write down what you know.
Step 2 is always: write the formula.
Step 3 is always: plug in the numbers.

The formula sheet is on the last page of your exam.
Use it.

Good luck tomorrow.

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