IGCSE FORCE AND PRESSURE

Which are examples of friction?

• 1 only

• 1 and 3

• 2 only

• 2 and 3

A spring is suspended from a stand. Loads are added and the extensions of the spring are measured. Which graph shows the result of plotting extension against load?

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An object is at rest on a horizontal surface. Which equation is used to calculate the pressure that the object exerts?

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The diagrams show the forces acting on four moving objects. Which object is moving at a constant speed?

• A

• B

• C

• D

A mass hangs vertically from a spring. The mass is raised to a point P and is then released. The mass oscillates repeatedly between point P and a lower point Q. Which energies alternately increase and decrease throughout the oscillations?

• gravitational potential energy, kinetic energy and elastic energy

• gravitational potential energy and kinetic energy only

• gravitational potential energy, kinetic energy and internal energy

• internal energy and elastic energy

Liquid of mass 92 kg is contained in a rectangular tank. The area of the base of the tank is 0.23 m2 . What is the pressure exerted by the liquid on the base of the tank?

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The table shows the weights and base areas of four metal blocks. Which block exerts the greatest pressure on its base?

• A

• B

• C

• D

Four of gravitational forces act between bodies in our solar system are listed below. Which of the following are an action-reaction pair?

• P and R

• P and S

• Q and R

• Q and S

Two vector quantities are added to produce a resultant. Which statement about the resultant is correct?

• The direction of the resultant is alway different from the direction of the vector.

• The direction of the resultant is always the same as the direction of one of the vector.

• The magnitude of the resultant is always different from the magnitude of the original vectors.

• The magnitude of the resultant may be zero.

A hydraulic lift is used to support a car of weight 9000 N. Piston A has a cross-sectional area of 0.05 m2 while piston B has a cross-sectional area of 2.0 m2 . What is the force F needed to support the weight of the car?

• 3600 N

• 900 N

• 450 N

• 225 N