International A Level (IAL)PhysicsEdexcelExam Questions1. Mechanics & MaterialsMoments

Moments (Edexcel International A Level (IAL) Physics): Exam Questions

Exam code: YPH11

27 mins5 questions

Select a download format for Moments

Scroll for more

Select an answer set to view for
Moments

Easy
Medium
Hard
1a
2 marks

A student used a force meter attached to one end of a uniform metre rule to determine the mass of a block. The centre of the metre rule is attached to a stand about which it can pivot.

A block of unknown mass m can be attached to the metre rule through one of the small holes, as shown.

A metre rule balanced on a central pivot stand, with a force meter attached at the zero mark on the left end and small holes at the 60, 70, 80 and 90 cm marks. A block of unknown mass m is at rest on the ground.

The student attached the block to each small hole and adjusted the force meter to make it vertical before taking a reading.

Explain how the student could check the metre rule is horizontal before taking a reading.

How did you do?

1b
Sme Calculator
4 marks

The student places the block at the 80 cm mark and pulls the force meter vertically downwards until the ruler is horizontal. The reading on the force meter is 1.45 N.

Calculate the mass m of the block. You should take moments about the pivot.

How did you do?

1c
3 marks

The student wants to reduce the percentage uncertainty in the value obtained for the mass of the block.

The student moved the force meter towards the centre of gravity of the metre rule and repeated the measurements.

Deduce whether the percentage uncertainty in the value obtained for the mass of the block is reduced by the student moving the force meter. No calculations are required.

How did you do?

1a
Sme Calculator
3 marks

A dragster is a racing car designed for a very short race along a completely straight track, so must be able to accelerate at a very high rate. The dragster and driver shown below have a combined weight of 1.23 × 104 N. The centre of gravity is 1.80 m in front of the rear axle.

q16-wph11-01-june-2021-edexcel-int-as-a-level-phy

The front axle of the dragster is 6.00 m from the rear axle.

Calculate the reaction forces R1 and R2, shown on the diagram, when the dragster is stationary and not accelerating.

R1 = ................................

R2 = ................................

How did you do?

1b
Sme Calculator
2 marks

When the dragster starts, there is a driving force that gives the dragster an initial forward acceleration of 5.50 g.

Calculate the initial driving force on the dragster.

Initial driving force = ...............................

How did you do?

1c
Sme Calculator
2 marks

The power from the car’s engine is constant.

Explain how the force from the engine varies as the car accelerates.

How did you do?

1a
Sme Calculator
4 marks

A large parasol has been set up on a windy day. The centre of gravity of the parasol is vertically above the centre of the base. The bottom of the parasol starts to lift from the ground as shown. The weight of the parasol is 110 N.

q19-wph11-01-oct-2021-edexcel-int-as-and-a-level-phy

The force of the wind is 14 N in a horizontal direction.

q19a-wph11-01-oct-2021-edexcel-int-as-and-a-level-phy

Explain why the parasol will topple. Your answer should include a calculation.

How did you do?

1b
Sme Calculator
5 marks

To prevent the parasol from toppling, a rope is attached to the parasol at 1.50 m from the ground as shown. The rope makes an angle of 44° to the vertical.

q19b-wph11-01-oct-2021-edexcel-int-as-and-a-level-phy

The horizontal force from the wind is now 25 N.

Determine, by taking moments about the centre of the base, the vertical force that the base exerts on the ground.

Assume that the force which the ground exerts on the base acts through the midpoint of the base.

Force exerted on the ground = ..........................................

How did you do?