SA2 FOCUS · Forces & Speed
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Secondary 1 · SA2 Topic Focus · Section D

Health, Speed
& Forces

Joints · Speed · Moments · Pressure
15 questions · self-marked · drill until 100%

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BBC Bitesize · Speed BBC Bitesize · Pressure & Moments Crash Course Physics · Motion in a Straight Line PhET sim · Balancing Act (moments) More videos →
💪 Joints & Muscles 🏃 Speed & Graphs ⚖️ Moments 👣 Pressure
💪
Part 1

Joints & Muscles

Remember: Muscles can only pull (contract) — never push. That is why they work in antagonistic pairs.
Q1
What type of joint is the elbow?
1 mark
Ball-and-socket joint
Pivot joint
Hinge joint
Fixed joint
Q2
Which joint lets your shoulder move in almost every direction (round and round)?
1 mark
Hinge joint
Fixed joint
Ball-and-socket joint
Gliding joint
Q3
Muscles that work in opposing pairs, like the biceps and triceps, are called what?
1 mark
Parallel muscles
Antagonistic muscles
Symmetric muscles
Voluntary muscles
Q4
You bend your arm to lift a drink to your mouth. What happens to the biceps and triceps?
2 marks
Biceps relaxes, triceps contracts
Biceps contracts, triceps relaxes
Both contract at the same time
Both relax and the arm bends by itself
JOINTS & MUSCLES — SECTION SCORE
0/5
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Part 2

Speed & Distance–Time Graphs

Formula triangle: Speed = Distance ÷ Time  •  Distance = Speed × Time  •  Time = Distance ÷ Speed. Units: metres per second (m/s).
Q5
Which formula correctly gives speed?
1 mark
Speed = Distance ÷ Time
Speed = Time ÷ Distance
Speed = Distance × Time
Speed = Distance + Time
Q6
A cyclist travels 150 m in 10 s. Calculate the average speed.
1 mark
m/s
Q7
A runner moves at 8 m/s for 12 s. How far does she travel? (Distance = Speed × Time)
2 marks
m
Q8
On a distance–time graph, what does a flat (horizontal) line tell you about the object?
1 mark
It is stationary (not moving)
It is moving at a steady fast speed
It is speeding up
It is moving backwards
Q9
Two lines are drawn on the same distance–time graph. Line P is steeper than line Q. What does the steeper line P show?
1 mark
P is moving slower than Q
P is moving faster than Q
P has stopped
P and Q move at the same speed
SPEED & GRAPHS — SECTION SCORE
0/6
⚖️
Part 3

Turning Moments

Moment = Force × distance from the pivot. Units: newton-metres (Nm). A see-saw balances when clockwise moment = anticlockwise moment.
Q10
How do you calculate the moment of a force?
1 mark
Force ÷ distance from the pivot
Distance ÷ force
Force + distance from the pivot
Force × distance from the pivot
Q11
A child pushes down with a force of 20 N at a distance of 3 m from the pivot of a see-saw. Calculate the moment.
2 marks
Nm
Q12
A see-saw is balanced. On the left, a 40 N weight sits 2 m from the pivot (moment = 80 Nm). On the right, a weight sits 4 m from the pivot. What force must the right-hand weight be?
2 marks
N
MOMENTS — SECTION SCORE
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Part 4

Pressure

Pressure = Force ÷ Area. Same force over a smaller area → higher pressure. Same force over a larger area → lower pressure.
Q13
Which formula correctly defines pressure?
1 mark
Pressure = Force ÷ Area
Pressure = Force × Area
Pressure = Area ÷ Force
Pressure = Mass × Gravity
Q14
A box pushes down with a force of 200 N over an area of 4 m². Calculate the pressure.
2 marks
Pa
Q15
A camel weighs 4000 N and has wide feet (area 2000 cm²). A horse also weighs 4000 N but has small feet (area 400 cm²). Why does the camel not sink into the soft sand while the horse does?
2 marks
The camel is lighter than the horse
Sand is harder where camels walk
The camel pushes with less force because it has four legs
The camel's wider feet spread its weight over a larger area, so the pressure on the sand is lower
PRESSURE — SECTION SCORE
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