A force meter, also called a _______________, is used to measure forces

The unit of force is called the ____________, and it has the symbol N.

The greater the force, the bigger the number, so 100 N is a greater force than 5 N. State true or false

Whenever an object moves against another object, it feels ____________________________. These forces act in the opposite direction to the movement.

Friction can be useful. For example:-

Friction can also be unhelpful. If you do not lubricate your bike regularly with oil, the friction in the chain and axles increases. What will happen to your bike if you do not lubricate it regularly?

When there is a lot of friction between moving parts, energy is transferred to the surroundings, causing heating. Think of what happens when you rub your hands together quickly.

Bikes, cars and other moving objects experience ___________ as they move. It is caused by the frictional forces of the air against the vehicle.

The _______________________the vehicle moves, the bigger the air resistance becomes. The top speed of a vehicle is reached when the force from the cyclist or engine is balanced by air resistance.

The force that pulls things to the ground on Earth (and other planets) is called ________________________.

Gravity also holds Earth and the other planets in their orbits around the __________________________________.

The force of gravity also exists on the Moon but it is not as strong as it is on Earth. This is because the Moon is much_________________________________ than our planet.

______________ is a type of friction between air and another material.

If you go swimming, there is friction between your skin and the water particles. This is known as _________________.