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Question 1

What are normal speeds for a person walking and a person runing?

Answer 1

Walking: 1.0m/s
Runing: 5.0m/s

Question 2

Explain the difference between scaler and vector quantities?

Answer 2

Scarlar quanitities only have size, vector quantities have size and direction.

Question 3

Name tree scaler quantities?

Answer 3

Distance, speed and mass

Question 4

Name three vector quantities?

Answer 4

Displacement, velocity and weight.

Question 5

state two factors that could increase the braking distance of a vehicle?

Answer 5

weather condition, state of brakes and speed of car

Question 6

Describe the energy transfer that takes place as a cyclist brakes.

Answer 6

Kenetic energy descreases, so the thermal energy increases.

Question 7

State how energy is stored in a spinning flywheel and how it can be increaded?

Answer 7

kinetic energy, increase the speed of spinning.

Question 8

State three different types of renewable energy sources?

Answer 8

Solar, wind and goethermal

Question 9

State three different types of non-renewable energy source?

Answer 9

Oil, gas and coal

Question 10

Explain why hydrogen atoms are isotopes

Answer 10

They have same number of protons but different mass.

Question 11

Explain how a nuclues changes when a B particle is emitted?

Answer 11

Number of protons descreases by one and number of protons increases by one.

Question 12

Explain what is meant by half-line?

Answer 12

time taken for the number of raioactive nuclei to half.

Question 13

Recall the speed with units

Answer 13

Speed=distance/time

Question 14

Recall the speed of wave equation with units

Answer 14

speed= frequency x wavelength

Question 15

Recall the force equation with units?

Answer 15

Force= Mass x Acceleration