iGCSE Physics 1st Final review

An object of mass 50 kg accelerates from a velocity of 2 m/s to a velocity of 10 m/s in the same direction. What is the impulse provided to cause this acceleration?

• 250 Ns

• 400 Ns

• 850 Ns

• 2500 Ns

A T-shaped girder is placed on the ground in position X. it is then turned over to position Y. What happens to the force on the ground and what happens to the pressure on the ground?

• force increases, pressure increases

• force increases, pressure remains the same

• force remains the same, pressure increases

• force remains the same, pressure remains the same

A cyclist travels down a hill from rest at point X, without pedalling. The cyclist applies his breaks and the cycle stops at point Y. which energy changes have taken place between X and Y?

• Gravitational potential -> kinetic -> thermal (heat)

• Gravitational potential -> thermal (heat) -> kinetic

• kinetic -> gravitational potential -> thermal (heat)

• kinetic -> thermal (heat) -> gravitational potential

A skier walks from the bottom of a ski slope to the top and gains 10,000J of gravitational potential energy. She skis down the slope. At the bottom of the slope, her kinetic energy is 2000J. How much energy is dissipated in overcoming friction and air resistance as the skier moves down the slope?

• 2000J

• 8000J

• 10,000J

• 12,000J

Which energy source is one that is used to boil water to make steam in power stations?

• energy from tides

• energy from waves

• hydroelectric energy

• nuclear energy

Which energy source is renewable and reliably available at all times?

• coal

• geothermal

• nuclear

• wind

Which energy resource is used to generate electricity without using any moving parts?

• geothermal

• hydroelectric

• nuclear

• solar

Which statement describes what happens as ice at 0°C starts to melt to become water?

• Energy is absorbed and the temperature remains constant

• Energy is absorbed and the temperature rises

• Energy is released and the temperature remains constant

• Energy is released and the temperature rises

Which quantity gives the thermal capacity of a beaker?

• The thermal energy required to change the state of the beaker at constant temperature

• The thermal energy required to raise the temperature of the beaker by 1°C

• The total mass of hot liquid that the beaker can hold

• The total volume of hot liquid that the beaker can hold

An athlete of mass 64 kg is bouncing up and down on a trampoline. At one moment, the athlete is stationary on the stretched surface of the trampoline. a.     State the form of energy stored due to the stretching of the surface of the trampoline.

• gravitational potential energy

• kinetic energy

• chemical energy

• elastic energy