Lesson 2.5.1
2.5.1 Moments, centre of gravity and the principle of moments Quiz: Pearson Edexcel Physics, Unit 2
20 questions
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Lesson 2.5.1, Moments, centre of gravity and the principle of moments: 20 multiple choice questions for the Pearson Edexcel Physics (9PH0), Unit 2: Mechanics, written with Revision Ninja.
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The 20 questions
-
Which distance is multiplied by force to calculate the moment about a pivot?
- Parallel distance
- Perpendicular distance
- Direct displacement
- Total path length
-
According to the principle of moments, what balances clockwise moments for a body in equilibrium?
- Horizontal forces
- Resultant acceleration
- Vertical forces
- Anticlockwise moments
-
Where is the centre of gravity located for a uniform rod?
- At geometric centre
- At left end
- At one-quarter length
- At right end
-
The SI unit of moment of a force is:
- N m^-1
- N
- J
- N m
-
A spanner of length 2.0 m is pushed at its end by a force of 40 N, perpendicular to the spanner. What is the moment about the nut?
- 80 N m
- 20 N m
- 40 N m
- 0.05 N m
-
A force of 40 N acts on a 0.50 m lever at 30 degrees to the lever. What is the moment about the pivot at the end of the lever?
- 35 N m
- 10 N m
- 20 N m
- 17 N m
-
A child of weight 300 N sits 1.5 m from the pivot of a seesaw. Where must an adult of weight 500 N sit on the other side to balance it?
- 2.5 m from the pivot
- 0.90 m from the pivot
- 0.60 m from the pivot
- 1.5 m from the pivot
-
A uniform plank 4.0 m long weighs 200 N and is pivoted at its left end. Where does its weight act from the pivot?
- 4.0 m from the pivot
- 200 m from the pivot
- 1.0 m from the pivot
- 2.0 m from the pivot
-
A uniform beam 4.0 m long and weighing 100 N rests on two supports at its ends. What is the reaction force at each support?
- 200 N
- 50 N
- 100 N
- 25 N
-
A uniform beam 3.0 m long weighs 60 N and is pivoted at its left end. A 90 N load acts at 2.0 m from the pivot. A rope holds the right end vertically upwards. What is the tension in the rope?
- 180 N
- 150 N
- 60 N
- 90 N
-
Why does a longer spanner make a tight nut easier to turn?
- Increases applied force
- Reduces thread friction
- Decreases required torque
- Increases the moment
-
A 60 N m clockwise moment and a 25 N m anticlockwise moment act about the same pivot. What is the net moment?
- 0 N m
- 35 N m anticlockwise
- 85 N m clockwise
- 35 N m clockwise
-
An object will topple when the vertical line through its centre of gravity falls where?
- Outside its base
- Through its centre
- Above its top
- Inside its base
-
A non-uniform metre rule balances on a pivot at the 60 cm mark. Where is its centre of gravity?
- At 50 cm
- At 40 cm
- At 60 cm
- At 0 cm
-
A 2.0 m long uniform rod of weight 20 N is pivoted at one end. It is held horizontally by a force at its free end acting vertically upwards. What is this force?
- 5 N
- 20 N
- 10 N
- 40 N
-
A balanced plank rests on a central fulcrum. What change causes it to tip to the right?
- Fulcrum moved right
- Load moved left
- Mass removed right
- Load moved right
-
A 5.0 N force is applied perpendicular to a 0.20 m spanner. What is the moment about the bolt?
- 0.25 N m
- 1.0 N m
- 10 N m
- 4.0 N m
-
A horizontal beam is pivoted at one end and held by a rope. What balances to keep it steady?
- Horizontal forces
- Opposite moments
- End masses
- Beam densities
-
A uniform 2.0 m plank of weight 50 N rests on two supports at its ends, with a 150 N load placed 0.50 m from the left end. What is the reaction force at the left support?
- 100 N
- 200 N
- 62.5 N
- 137.5 N
-
If three non-parallel coplanar forces keep an object in equilibrium, where do their lines of action meet?
- At two points
- Parallel to each
- At one point
- They never meet
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