Cognito · AQA Physics 2026/27Resultant Forces and Moments
Key facts
Vectors and scalars — fill in the table
Term
Definition
Scalar
Vector
Resultant force
Moments and centre of mass — fill in the table
Term
Definition
Moment
Centre of mass
Exam questions — 4 questions · 12 marks
⚡ Extended questions included. Show all working for calculation questions. The AI marks against the real AQA mark scheme.
1 markVector vs scalarAQA 8463 P2 style
Which pair of quantities are both vectors?
A Speed and velocity
B Force and acceleration
C Mass and weight
D Distance and displacement
3 marksResultant forceAQA 8463 P2 style
A car of mass 1200 kg has a driving force of 3000 N forwards and a friction force of 800 N backwards. Calculate (a) the resultant force and (b) the acceleration of the car. (3 marks)
Hint: (a) Subtract opposing forces. (b) Use F = ma, rearranged as a = F/m.
+30 XP
4 marksMoment calculationAQA 8463 P2 style
A 3 m uniform beam is balanced on a pivot at its centre (1.5 m from each end). A 60 N weight hangs 1.5 m to the left of the pivot. Calculate the force F that must be applied 0.5 m to the right of the pivot to balance the beam. (4 marks)
Hint: Moment = force × distance from pivot. Set clockwise = anticlockwise moments and solve for F.
+40 XP
1 markCentre of mass stabilityAQA 8463 P2 style
Why is a racing car designed with a very low centre of mass and a wide wheelbase?
A To reduce air resistance and allow higher speeds
B To make the car heavier so it has more grip
C A low centre of mass and wide base means the car can tilt further before the centre of mass moves outside the base — making it much harder to topple