Lesson: Forces. Science Differentiation in action A force is a _ or . which can change the...

Lesson: Forces

Science Differentiation in action

A force is a _____ or ____.

which can change the shape, speed or direction of an object.

Push Pull

Can you think of some examples of forces changing the: (i) shape, (ii) speed and (iii) direction of an object?

A shopping trolley is pushed with a force of:

A force is measured in Newtons (N).

SIR ISAAC NEWTON

~ 75 N.

There are many different forces.

Can you give some examples?

We can measure small forces using a:

Spring Balance

Hang an object on the hook and read the scale to find the force of the object pulling down.

Forces act in pairs.

For every force there is an equal and opposite force.

FRICTION is a force.It slows down movement betweentwo objects in contact.

How can we prevent friction?

Friction is a disadvantage if we want to go quickly.

Friction is an advantage if we want to go slowly.

Why is it important that tyres have good treads?

Describe what is in this picture.

What do you think happened to the damaged tyres?

Rub your hands together very quickly.

What happens?

Friction causes heat.

Now put some washing up liquid on your hands and rub them together again.

What happens?

We can reduce friction using a Lubricant.

Where do we use oil to reduce friction?

An apple falls to earth because the force of gravity acts between the apple and the earth.

Gravity is the FORCE of attraction between two objects that have mass.

What are the forces in this picture?

1. Forces are measured using a ___________.

Review Questions

2. What unit are forces measured in?

Why doesn’t the satellite fall to earth?

Question to think about!

Lesson: Forces. Science Differentiation in action A force is a _____ or ____. which can change the...

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Lesson: Forces. Science Differentiation in action A force is a _ or . which can change the...

Transcript of Lesson: Forces. Science Differentiation in action A force is a _ or . which can change the...