9I Quick Quiz

What are the four forces acting on a plane and where do they act?

c

d

e

f

Drag

Lift from the wings

Weight

Thrust or driving force

Water resistance

Reaction

Balanced forces:

• make objects speed up.

• make objects slow down.

• do not change the speed of moving objects.

• only affect stationary objects.

A boat has a forwards force on it of 500N and water resistance is 400N. The forces are ​ (a)   and the boat will ​ (b)   .

• unbalanced
• balanced
• go faster
• continue to move at the same speed
• slow down

 Which of these is not a way in which energy is stored?

• Chemical

• Kinetic

• Elastic

• Thermal

Which of these is a way in which energy can be transferred?

• Movement

• Petrol

• Light

• Potential

In which ways is energy most often transferred as wasted energy?

• heating and light

• heating and sound

• sound and light

• sound and kinetic

Which of these machines is the more efficient and why?

• Y because it does not waste as much energy as X

• Y because it wastes more energy than X

• X because it transfers the most energy

• X because it wastes more energy than Y

The speed of a car is a measure of how:

• far it is travelling.

• fast it is travelling.

• long it is travelling.

• high it is travelling.

A bus travelled a distance of 20 km in 2 hours. Its speed was:

• 0.1 km/h

• 40 km/h

• 20 km/h

• 10 km/h

The mean (or average) speed of something is:

• its fastest speed.

• the total distance it travels divided by the time taken.

• its slowest speed.

• its speed limit.