Other Physics Answers

1. Explain how you can use the technological process as an approach for teaching natural 

sciences and technology (NST) in the intermediate phase. (5)

2. Use suitable examples to clarify how it differs from but is closely linked to scientific 

method of investigations. (5)

3. The focus of natural sciences and technology (NST) as a school subject in the 

Intermediate Phase is the development of learners’ process-oriented thinking abilities / 

process skills. This focus of NST requires teachers to facilitate NST learning that 

encourages the development of learners’ critical thinking; decision-making, problem-

solving and design process skills.

Briefly discuss decision making and creative thinking as key educational objectives of the 

technological process and scientific process. (4+4 = 8)

4. There is a close relationship between the design process and problem-solving process. 

Discuss this relationship and its implication on the teaching of NST. 

Explain how you can use the technological process as an approach for teaching natural 

sciences and technology (NST) in the intermediate phase.

 A person rides up a lift to a mountaintop, but the person’s ears fail to “pop”—that is, the pressure of the inner ear does not equalize with the outside atmosphere.

The radius of each eardrum is 0.40 cm. The pressure of the atmosphere drops from 1.010 × 105 Pa at the bottom of the lift to 0.998 × 105 Pa at the top.

a. What is the pressure difference between the inner and outer ear at the top of the mountain?

b. What is the magnitude of the net force on each eardrum?

1. In a car lift, compressed air exerts a force on a piston with a radius of 5.00 cm.

This pressure is transmitted to a second piston with a radius of 15.0 cm.

a. How large a force must the compressed air exert to lift a 1.33 × 104 N car?

b. What pressure produces this force? Neglect the weight of the pistons.

How much force is required to pull a spring 3.0 cm from its equilibrium position if

the spring constant is 2.7 × 103 N/m?

Two people are attempting to push a 1000 kg car on a horizontal plan for 100 meters. Assume they are pushing on the car at a 20° angle upward with a force of 500N, how much work is being done?

What is the mass of an object that takes 495 joules of work to get to a height of 30 meters?

ABCD is a quadrilateral with G and H the mid points of line DA and DC respectively. Show that line AB + line DC = 2GH

What is the potential energy associated with an 80 kg skier at the top of a 200 m hill?

1) How much work is done when a 20 N force is applied horizontally to a block on a frictionless horizontal surface for a distance of 5 meters?