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CAIE IGCSE Physics Effects of Forces Question Bank

Practise resultant forces, friction, drag, springs and circular motion, linking force to deformation, acceleration, equilibrium and changes in velocity.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • combine force magnitudes and directions to determine the resultant and resulting motion
  • apply F = ma, friction or drag to acceleration, balanced motion and terminal behaviour
  • use spring graphs and k = F/x or identify inward resultant force in circular motion

Covered syllabus points

1.5.1.1—Forces may produce changes in the size1.5.1.2—Load–extension graphs for an elastic1.5.1.3—Resultant of two or more forces acting1.5.1.4—An object either remains at rest or1.5.1.5—A resultant force may change the1.5.1.6—Solid friction as the force between1.5.1.7—Friction (drag) acts on an object1.5.1.8—Friction (drag) acts on an object1.5.1.9—Spring constant as force per unit1.5.1.10—Term ‘limit of proportionality’ for a1.5.1.11—Recall/use: F = ma1.5.1.12—Circular motion caused by a force

1.5.1 Effects of forces question 1

[Maximum number: 3]

Question (a)

(a)

A resultant force is applied to an object moving with a velocity v in a straight line.

[ 3 ]

Question (i)

(i)

State two different changes to the motion that the resultant force may cause.

1
2

[ 2 ]

Question (ii)

(ii)

State one other way that forces may change a stationary object.

[ 1 ]

1.5.1 Effects of forces question 2

[Maximum number: 6]

A force is a vector quantity.

Question (a)

(a)

A student suspends a spring from a clamp stand and measures the length l0l_{0} of the spring.

Fig. 2.1 shows the apparatus.

Fig. 2.1 (not to scale)

Fig. 2.1 (not to scale)

The student then suspends loads of different weights from the spring and measures the length of the spring for each load. He then plots a graph of the length of the spring against weight.

Fig. 2.2 is the graph that the student plots.

Fig. 2.2

Fig. 2.2

[ 6 ]

Question (i)

(i)

Using Fig. 2.2, determine the initial length l0l_{0} of the spring.

l0=l_{0}=
[ 1 ]

Question (ii)

(ii)

State what is meant by the limit of proportionality and, using Fig. 2.2, determine the weight of the load that causes this spring just to reach the limit of proportionality.
limit of proportionality
weight =

[ 2 ]

Question (iii)

(iii)

Using Fig. 2.2, determine the spring constant of this spring.
spring constant =

[ 3 ]

1.5.1 Effects of forces question 3

[Maximum number: 3]

Question (a)

(a)

A 20 N force and a 15 N force act at the same time on an object of mass 14 kg .

Calculate

[ 3 ]

Question (i)

(i)

the maximum possible force on the object due to these two forces,
force =

[ 1 ]

Question (ii)

(ii)

the acceleration caused by a resultant force equal to this maximum force.
acceleration =

[ 2 ]
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