Question 1
A ladder rests on a rough wall and rough horizontal ground. Which diagram correctly labels all forces acting on the ladder?
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DP IB Physics: HL
Topic Questions
2.2 Forces
Question 2
A parachutist of mass 75 kg is falling vertically through the air at a constant speed of 0.6 m s–1.
What is the resultant force on the parachutist?
0 N
75 N
750 N
1000 N
Question 3
Which statement best summarises Newton's Third Law of Motion?
If object X exerts a force on object Y, then object Y exerts a greater and opposite force on object X
If object X exerts a force on object Y, then object Y exerts a lesser and opposite force on object X
If object X exerts a force on object Y, then object Y exerts an equal and opposite force on object X
If object X exerts a force on object Y, then object Y exerts no force on object X
Question 4
The image shows a block resting on an inclined plane.
Which row in the table gives the correct interpretation of the forces acting on the block, R, F and W?
| R | F | W | |
| A. | weight | reaction | static friction |
| B. | dynamic friction | weight | reaction |
| C. | reaction | dynamic friction | weight |
| D. | reaction | static friction | weight |
Question 5
Which statement about Newton's Second Law of Motion is true?
For bodies of constant mass, the resultant force acting on it is inversely proportional to its acceleration
For bodies of a non-constant mass, the resultant force acting on it is proportional to its acceleration
For bodies of constant mass, the resultant force acting on it is proportional to its acceleration
For bodies of a non-constant mass, the resultant force acting on it is inversely proportional to its acceleration
Question 6
Which of the following statements about friction is not true?
Friction always acts in the opposite direction to the direction of motion
Static friction occurs when two solid objects are in contact and no movement occurs between the two objects
For a stationary object, the force due to the coefficient of dynamic friction is at a maximum
For a stationary object, the force due to the coefficient of dynamic friction is zero
Question 7
Which statement best summarises Newton's first law of motion?
Whenever two objects interact the forces they exert on each other are opposite.
A resultant force on an object is equal to the rate of change in momentum.
A body will remain at rest or move with constant velocity unless acted on by a resultant force
A body will move in a constant velocity only if there is a resultant force acting upon it
Question 8
Which statement about drawing free body diagrams is not correct?
Arrows must be drawn to scale and represent the size of the force involved
All force arrows must touch the object applying the force
Force arrows must be drawn as straight lines with a ruler
Force arrows don't have to be labelled
Question 9
Which of the following equations for static friction is correct?
F = ma
Ff ≤ μsR
Ff = μdR
F = IΔt
Question 10
Which statement is correct about the coefficient of friction, μ?
It is always between 0 and 1
The coefficient of friction can be different for the same material in different situations
The coefficient of dynamic and static friction between the same two surfaces will be different
The coefficient of dynamic friction is equal to the frictional force multiplied by the reaction force
