The state of an object when there is no resultant force or moment acting on it.

The turning effect of a force, measured in newton metres (Nm).

A type of lever that increases the size of an applied force.

A type of lever that increases the distance an applied force moves through.

Toothed wheels that rotate around an axle and are used to transfer moments.

Moments, levers and gears

Physics

In the Gravity in space unit, they will build on this knowledge to learn about centripetal forces, orbital motion, stellar evolution, red shift and the big bang.

In the Energy of moving objects unit, pupils learnt how to calculate the amount of energy of objects have because they are moving, stretched or in a gravitational field; and to calculate energy transfers using knowledge of energy conservation and dissipation.

Forces make things change

the state of an object if there is no resultant force or moment on it

the turning effect of a force, measured in newton metres (Nm)

a lever that increases the size of an applied force

a lever that increases the distance an applied force moves through

a toothed wheel that rotates and is used to transfer a moment

Match the following key terms to their definition.

In how many of the following situations is the box in equilibrium?

A lever can be a force multiplier or a distance multiplier. Which of the following levers is a distance multiplier?

What is the moment about the pivot caused by the force in the following diagram?

What is the moment caused by the force about the pivot in the following diagram? 
You need to choose the correct distance for your calculation.

Gear Y makes $$\frac{1}{3}$$ of a rotation.

The diagram shows a set of gears, X and Y, in a machine. Using an attached handle, a person produces a moment of 18 Nm about gear X, which rotates once. Which of the following statements are correct? 

Which of the following are the unit of force and its symbol?

An object is __________ if no resultant force acts on it.

What is the resultant force acting on the parachutist?

There are no forces acting on the object.

There is an even number of forces acting on the object.

The vector sum of the forces acting on the object is zero.

The forces acting on the object are all in equal and opposite pairs.

Which of the following conditions is required for an object to be in equilibrium?

When an object rotates in the same direction as the hands on a clock, the direction of rotation is called {{}}.

When an object rotates in the opposite direction as the hands on a clock, the direction of rotation is called {{}}.

Exit Quiz