Newton's First Law

Science

Calculating speed

Measuring speed: practical

Measuring speed accurately

Reading distance-time graphs

Interpreting distance-time graphs

Changing speed

Streamlining

Comparing the speeds of different parachutes

Changing the speed of a parachute

In the Measuring and calculating motion unit, they will build on this knowledge to learn how to measure and calculate velocity and acceleration, and how to interpret velocity-time graphs. 

In the Forces unit, pupils learn to accurately describe and explain the actions of forces in a range of situations. 

This unit explores speed, forces, and motion, including effects on objects. It covers deriving equations, calculations, and distance-time graphs. Learn to use force arrows, identify balanced and unbalanced forces, and understand their impact on movement.

Moving by force

force between two surfaces in contact when one tries to move

the sum of the forces on an object accounting for direction

a change in speed or direction of movement

A car speeding up as it travels along a road.

A shopping trolley being pushed by a customer.

Which of these is an example of an object that has no propelling (forwards acting) force?

If it is stationary it will remain stationary.

If it is moving it will stay moving at the same speed in the same direction.

If it is moving it must change speed or direction.

Which of these are true when there is no resultant force acting on an object?

The figure shows two forces acting on a lorry. What is the resultant force on the lorry?

The figure shows two forces acting on a moving lorry. What will happen to the lorry?

The ball is at its highest speed at point B.

There is no force acting forwards between B and C

There is no resultant force on the ball between B and C.

The ball speeds up between points B and C.

A frictional force acts on the ball between points B and C.

A bowling ball is launched from a ramp along a bowling alley as shown in the figure. Which of the following statements are true?

What can make an object speed up, slow down, change direction or change shape?

What is the name of the force which is produced when two solid surfaces rub against each other?

What is the name of the force that opposes movement when a solid object passes through a liquid or gas?

A firework has a weight of 0.2 N and it produces an upwards thrust of 1.0 N when launched. What it the resultant force on the firework?

The force of friction will push the trolley forwards.

A push force is still driving the trolley forwards.

There is no force pushing the trolley forwards.

Fiction and drag will cause the trolley to immediately stop.

Friction and drag will cause the trolley to gradually slow down.

Someone pushes a trolley along a flat road until it is moving quickly. They then jump on for a ride, putting both their feet up. Which of these statements is correct after they are on the trolley?

A child lets go of a bundle of ten large helium balloons, each has a weight of 0.5 N. Each balloon produces an upthrust of 1 N. What is resultant force on the bundle of balloons?

Starter Quiz

What can make an object speed up, slow down, change direction or change shape?