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DP IB Physics: HL

Topic Questions

Home / IB / Physics: HL / DP / Topic Questions / 2. Mechanics / 2.2 Forces / Multiple Choice

2.2 Forces

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Question 1

Marks: 1

A wooden block of weight W rests on a rough board that produces a friction force F. The end of the board is then raised up to angle θ until the block slides down the plane of the board at constant velocity v.

q11_forces_ib-sl-physics-mcq

Which row describes the forces acting on the block as it slides down the board?

	Frictional force on block	Resultant force on block
A.	W sin θ	0
B.	W cos θ	W sin θ – F
C.	W cos θ	0
D.	W sin θ	F – W sin θ

Key Concepts

Newton's Second Law

Question 2

Marks: 1

Which row gives the correct Newton’s third law force pair for a book on a table?

	Force A	Force B
A.	Weight of the book	Force of book on the table
B.	Gravitational force of the Earth pulling on the book	Gravitational force of the book pulling on the Earth
C.	Weight of the book	Reaction force from the table surface
D.	Gravitational force of the Earth pulling on the book	Gravitational force of the table pulling on the Earth

Key Concepts

Newton’s Third Law

Question 3

Marks: 1

An object of mass m is connected via a frictionless pulley to an object of mass M, where M > m. M rests on a horizontal rough surface with a frictional force f. q13_forces_ib-sl-physics-mcq

What is the acceleration of the system?

0
$\frac{m g + f}{(M + m)}$
$\frac{m g - f}{(M + m)}$
g

Key Concepts

Newton's Second Law

Question 4

Marks: 1

A photo hangs from two strings. It has a weight W and the two strings have equal tension T.

What is the free–body diagram for this situation?

q14_forces_ib-sl-physics-mcq

Key Concepts

Free-Body Diagrams
Vectors

Question 5

Marks: 1

Which of the following are possible values for the maximum coefficient of static friction, $μ_{S}$ and dynamic friction, $μ_{d}$ ?

	$μ_{S}$	$μ_{d}$
A.	0.012	0.78
B.	0.35	0.12
C.	1.50	0.90
D.	0.26	–0.77

Key Concepts

Question 6

Marks: 1

A uniform ladder resting in equilibrium on rough ground leans against a smooth wall.

Which diagram correctly shows the forces acting on the ladder?

q16_forces_ib-sl-physics-mcq

Key Concepts

Vectors
Free-Body Diagrams

Question 7

Marks: 1

A block of mass m rests on a trolley of mass M. The coefficient of dynamic friction between the block and the trolley is µ.

A horizontal force F acts on the block causing it to slide over the trolley. What is the acceleration of the trolley?

$\frac{F - μ m g}{M}$
$\frac{μ m g}{(M + m)}$
$\frac{F - μ M g}{m}$
$\frac{μ m g}{M}$

Key Concepts

Friction
Newton's Second Law

Question 8

Marks: 1

A sled with a child has a combined weight of 400 N and rests on a horizontal surface. The coefficient of static friction between the sled and the surface is 0.50 and the coefficient of dynamic friction is 0.30.

A horizontal force F is applied to the sled and its magnitude increases uniformly from zero. Once the sled starts moving, the pulling force no longer increases.

What is the minimum resultant force required on the moving sled?

80 N
–80 N
320 N
0 N

Key Concepts

Friction
Free-Body Diagrams

Question 9

Marks: 1

Two coplanar forces of 11 N and 7 N act on an object. Which force could not be the resultant for these two forces?

18 N
1 N
9 N
4 N

Key Concepts

Vectors
Newton's Second Law

Question 10

Marks: 1

Two boxes in contact are pushed in a line along a floor with a force F. The boxes are moving at a constant speed. Box X has a mass m and box Y has a mass 3m. q20_forces_ib-sl-physics-mcq

What is the resultant force acting on Y?

F
$\frac{F}{3}$
3F
0

Key Concepts

Newton's Second Law

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