Forces & Motion

What are forces X and Y?

• X is air resistance, Y is gravity

• X is air resistance, Y is friction

• X is weight, Y is air resistance

• X is friction, Y is air resistance

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 forward force on it of 500 N and water resistance is 400 N. Which statement is true?

• the forces are balanced and the boat will go faster

• the forces are balanced and the boat will continue to move at the same speed

• the forces are unbalanced and the boat will go faster

• the forces are unbalanced and the boat will continue to move at the same speed

All vehicles have a top speed. This is when...

• the air resistance is the same as the force from the engine

• the drag and friction forces balance the maximum force from the engine

• the force from the engine balances friction from the wheels

• the drag forces balance the friction forces

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

• chemical

• kinetic

• friction

• 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 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