Year 3: Forces, Gravity, Friction.

What is the definition of Friction?

• A force between two surfaces that slows down moving objects.

• A surface without much friction.

• The outside of an object (adjective).

What is the definition of Slippery?

• Being able to keep things in place.

• A surface without much friction (adjective).

Define surface (*hint: is it the inside or outside of an object?)

What is a forcemeter?

• An equipment (machine) used to measure the strength of a force.

• Being able to keep things in place.

What is gravity?

• The outside of an object.

• The weight of someone

• A force that pulls objects towards the centre of the Earth.

Define weight

• An unofficial way of measuring, like using your hand.

• The downwards force on an object pulling it towards the ground.

• A way of measuring used across the world (like Newtons).

What is to "fall"? To move where (up or down?) because of what force (Gravity or Friction?) ?

What is a Non-standard unit of measurement?

• A way of measuring using an object that other people would not be able to use, for example, your hand.

• A way of measuring that is used across the world (like Newtons, KGs, and grams).

What is a Standard unit of measurement?

• A way of measuring that is used across the world (like Newtons, KGs, and grams).

• A way of measuring using an object that other people would not be able to use, for example, your hand.