Lesson 3.03r
3.03r Frictional forces Quiz: OCR Maths, Unit 18
20 questions
In partnership with Revision Ninja
Lesson 3.03r, Frictional forces: 20 multiple choice questions for the OCR Maths (H240), Unit 18: Forces and Newton's Laws, written with Revision Ninja.
Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.
The 20 questions
-
What two components make up the total contact force between two rough surfaces?
- Weight and friction
- Tension and normal
- Normal and frictional
- Tension and thrust
-
What is the relationship between maximum friction F, coefficient mu, and normal reaction R?
- F = mu + R
- F = R / mu
- F = mu R
- F = mu / R
-
Which term describes the state of a body when friction reaches its maximum possible value?
- Dynamic equilibrium
- Neutral equilibrium
- Limiting equilibrium
- Unstable equilibrium
-
A body on a rough horizontal plane is not moving. What inequality bounds the frictional force F?
- F = mu R
- F <= mu R
- F > mu R
- F >= mu R
-
How is the magnitude of the total contact force C related to normal force R and friction F?
- C = sqrt(R^2 + F^2)
- C = R + F
- C = R - F
- C = sqrt(R + F)
-
A block of mass 4 kg rests on a rough horizontal surface with mu = 0.5. Find limiting friction.
- 2 N
- 9.8 N
- 19.6 N
- 39.2 N
-
In which direction does the frictional force always act relative to potential motion?
- Same
- Perpendicular
- Opposite
- Parallel
-
What is the value of the coefficient of friction mu for a smooth surface?
- 9.8
- Infinity
- 1
- 0
-
A 2 kg box slips on a rough floor with mu = 0.3. Calculate the frictional force acting.
- 5.88 N
- 19.6 N
- 2.94 N
- 0.6 N
-
A horizontal force of 10 N acts on a block, but it stays at rest. What is the friction force?
- 10 N
- 0 N
- 9.8 N
- 5 N
-
If normal reaction doubles and the surface roughness is unchanged, what happens to limiting friction?
- It quadruples
- It doubles
- It halves
- It stays constant
-
A block of mass 5 kg is placed on a rough plane inclined at 30 degrees. What is R?
- 10 N
- 24.5 N
- 42.4 N
- 49 N
-
Which component of contact force acts perpendicular to the surface of contact?
- Normal contact force
- Frictional contact force
- Gravitational force
- Tension force
-
A force vector for contact force is (3i + 4j) N. What is its magnitude?
- 1 N
- 12 N
- 7 N
- 5 N
-
A box on a rough slope is on the point of slipping down. Which direction does friction act?
- Vertically downwards
- Up the slope
- Down the slope
- Perpendicular to slope
-
A block of mass 10 kg slides down a rough slope with acceleration 1 m/s^2. What is net force?
- 98 N
- 88 N
- 10 N
- 1 N
-
What dimensionless scalar quantity measures the roughness between two interacting surfaces?
- Contact force magnitude
- Normal reaction force
- Coefficient of friction
- Limiting force ratio
-
A 3 kg object on a horizontal plane has limiting friction 14.7 N. What is coefficient mu?
- 0.8
- 0.2
- 0.5
- 0.3
-
If friction vector is -6i N and normal contact vector is 8j N, what is total contact force?
- 14ij N
- 2i + j N
- 48ij N
- -6i + 8j N
-
An object on a rough slope inclined at angle theta is in limiting equilibrium. What is mu?
- 1 / tan(theta)
- tan(theta)
- cos(theta)
- sin(theta)
Related quizzes
- Methods of proof Quiz · 1.01 · 20 questions
- Indices and surds Quiz · 1.02a · 20 questions
- Straight lines and circles Quiz · 1.03a · 20 questions
- Binomial expansion Quiz · 1.04a · 20 questions
- Trigonometric functions and triangles Quiz · 1.05a · 20 questions
- Exponential functions Quiz · 1.06a · 20 questions
- Gradients and second derivatives Quiz · 1.07a · 20 questions
- Fundamental theorem of calculus Quiz · 1.08a · 20 questions
- Locating and approximating roots Quiz · 1.09a · 20 questions
- Vectors in two and three dimensions Quiz · 1.10a · 20 questions