Physics EASE2 Remedial

A learner is investigating springs. The learner hangs a spring from a clamp stand as shown. On the figure, label the point where the load should be attached.

A learner is investigating springs. The learner hangs a spring from a clamp stand as shown. First, she attached a 2 kg block on the spring. After that, she adds a heavier load to the spring. What will happen to the length of the spring compared to the previous length?

The figure shows a nail that will be pushed into wood using force from a hammer. Explain how the sharp point on the nail helps the nail go into the wood.

A nail will be pushed into wood using force from a hammer. The area of the point of the nail in contact with the wood is 0.065 cm². The force from the hammer is 400 N. Calculate the pressure exerted by the point of the nail on the wood. Give your answer to 2 significant figures.

A salmon is a fish that can swim in both rivers and in the sea. The density of water in the sea is greater than the density of water in rivers.

Salmon A is in a river.

Salmon B is in the sea.

Both salmon are at the same depth. EXPLAIN which salmon experiences greater pressure from the water.

The energy from the fuel is 2 kJ. Calculate the energy used for other processes in the power station?

A book is placed on a bookshelf 20 m high. The book falls. Using the concept of conservation of energy, calculate the speed of the book just before it hits the ground.

Match the energy resource with the source of the energy.

Groups:

(a) The Sun is the source

,

(b) The Sun is not the source

• wind power

• fossil fuels

• hydroelectric power

• tidal power

• biomass fuels

• nuclear fuels

• geothermal power

Your neighbour is lifting bricks and placing them on top of a wall. He lifts them slowly, one at a time. State a way in which he could increase his power (the rate at which he is transferring energy to the bricks).

The figure shows a learner modelling a sound wave in a long spring.