M2 Basic Science Midterm Review - Term 2

Which best describes work correctly?

• it is a push or pull

• it is the ability to do work

• it is the rate of work being done.

• it is the product of force and the distance an object moves

Which situation shows no work is done?

• A boy mopping the floor.

• A girl flipping the pages.

• A father sitting on the floor

• A mother cutting vegetables

Which of the following statements is correct?

• Power is the ability to do work.

• The SI unit for power is working.

• Power and energy have the same SI unit.

• A machine has a high power when it can get things done in a shorter time.

The power of the machine is 50 W. It manages to lift a 100 N box to a height in 5 secs. What is the height at which the machine manages to lift the box?

• 1 m

• 10 m

• 5 m

• 2.5 m

A monkey with a mass of 20kg climbs a tree 15 m high in 8s. What power does it generate? (Weight 1 kg = 10 N)

• 37.5 W

• 106.7 W

• 375 W

• 2400 W

What is Kinetic energy?

• stored by an object due to its position

• possessed by all moving objects

• given out by radioactive substances

• taken by plants to produce food

Potential energy can be stored in the following conditions, EXCEPT

• compressed spring

• a bent plastic ruler

• stretched rubber bands

• a campfire

Which of the following pairs is incorrect?

• Potential energy- A pendulum at its highest point

• Kinetic energy- A rubber band being stretched

• Chemical energy- Energy stored in cooking oil

• all of the above

Which of the following forms of energy will increase when the ball rolls down a smooth inclined plane?

• Kinetic energy

• Potential energy

• Heat energy

• Chemical energy

Which of the following types of energy is not involved in the change of energy when a torch is switched on?

• Electrical energy

• Light energy

• Potential energy

• Chemical energy