Lesson 3.03t
3.03t Coefficient of friction Quiz: OCR Maths, Unit 18
20 questions
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Lesson 3.03t, Coefficient of friction: 20 multiple choice questions for the OCR Maths (H240), Unit 18: Forces and Newton's Laws, written with Revision Ninja.
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The 20 questions
-
Which symbol represents the coefficient of friction between two surfaces?
- eta
- lambda
- rho
- mu
-
What is the maximum value of frictional force called before slipping occurs?
- Dynamic friction
- Limiting friction
- Normal reaction
- Terminal friction
-
Which equation defines the maximum frictional force, F, in terms of normal reaction, R?
- F = R / mu
- F = mu R
- F = m R
- F = mu / R
-
When a body is at rest on a rough surface, which inequality describes friction F?
- F <= mu R
- F >= mu R
- F > mu R
- F = mu / R
-
A block rests on a rough horizontal surface with R = 20 N and mu = 0.3. Find limiting friction.
- 60 N
- 20.3 N
- 6 N
- 20 N
-
What happens to the magnitude of friction once an object begins to slide?
- F > mu R
- F becomes zero
- F = mu R
- F < mu R
-
What force acts perpendicular to the contact surface between two rough objects?
- Weight
- Tension
- Normal reaction
- Frictional force
-
How is the magnitude of the total contact force C related to reaction R and friction F?
- C = R + F
- C = sqrt(R + F)
- C = sqrt(R^2 + F^2)
- C = R - F
-
A block of mass 4 kg rests on a rough plane. What is its normal reaction R?
- 4 N
- 4g N
- 0.4g N
- 4/g N
-
A horizontal force of 5 N tries to move a stationary block, but it stays still. What is F?
- 5 N
- 9.8 N
- 0 N
- mu R N
-
An object slides down an inclined plane. In which direction does friction act?
- Perpendicular to slope
- Vertically downwards
- Up the slope
- Down the slope
-
If a surface is described as smooth, what is the value of the coefficient of friction?
- Undefined
- 0
- 1
- Infinity
-
A 2 kg box is on a rough slope inclined at 30 degrees. What is the normal reaction?
- 2g tan(30) N
- 2g sin(30) N
- 2g cos(30) N
- 2g N
-
What is the unit of the coefficient of friction mu?
- Metres per second
- Newtons
- No units
- Kilograms
-
A block on a rough horizontal plane has R = 50 N. If mu = 0.4, find maximum friction.
- 20 N
- 50.4 N
- 12.5 N
- 200 N
-
When an object is on the point of sliding, in what state is it said to be?
- Dynamic equilibrium
- Neutral equilibrium
- Limiting equilibrium
- Unstable equilibrium
-
A body of mass m accelerates down a rough slope. What is the net force down the slope?
- mg sin(theta) - F
- F - mg sin(theta)
- mg cos(theta) - F
- mg sin(theta) + F
-
If mu = 0.5 and maximum friction F = 15 N, what is the normal reaction force R?
- 7.5 N
- 15.5 N
- 60 N
- 30 N
-
A 10 kg mass moves at constant speed horizontally with mu = 0.2. What horizontal force is required?
- 0.2 N
- 10g N
- 2g N
- 5g N
-
On a rough plane inclined at angle theta, what condition allows a block to remain at rest without slipping?
- tan(theta) <= mu
- sin(theta) <= mu
- cos(theta) <= mu
- tan(theta) >= mu
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