Contact forces | Science | Quizalize & Oak National Academy

Starter quiz

Which of these pictures shows a squash?

squeezing blu-tack between finger and thumb ✓

pulling blu-tack between two hands

twisting the blu-tack between two hands
A ______ force happens when two surfaces move over each other.

'Friction' ✓
What do friction forces do to moving objects?

speed them up

slow them down ✓

change their colour

change their weight
Which material can you squash?

dough ✓

wood

brick
How would you make this light switch work?

push it ✓

pull it

twist it
Are friction forces helpful or unhelpful for these activities? Match the word to the activity.

unhelpful

⇔

travelling down a slide fast ✓

helpful

⇔

running along a running track ✓

Forces are ______ and pulls.

'pushes' ✓
Which of these activities involves both pushing and pulling?

closing a cupboard door

rowing a boat ✓

opening curtains
Match the forces word to the activity.

pull

⇔

taking part in a tug of war competition ✓

push

⇔

ringing a doorbell ✓

pull

⇔

using a zip to fasten a coat ✓

push

⇔

using a remote control ✓
Contact forces act between objects that are ______ each other.

'touching' ✓
Which of these statements about skating is true?

When skating, there are no contact forces.

Skating uses contact forces. ✓

When skating, the wheels of the skate make contact with the floor. ✓
Which of these involves contact forces?

an apple falling off a tree

pushing a wheelchair ✓

rolling a bowling ball ✓

a magnet sticking to a fridge

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Pushes and pulls are forces
Some forces are contact forces
Contact forces are forces that act between two objects that are physically touching each other
Pushing a car up a hill and kicking a ball are examples of contact forces

Kicks/throws and catches are not pushes and pulls.

Explicit explanation that kicks and throws are pushes, and catches are pulls; that pushes and pulls can involve short term contact.

Force - A force is a push or a pull. Forces can make objects move, slow down, change direction or change shape.
Push - A push is a force that moves an object further away.
Pull - A pull is force that brings an object closer.
Contact force - Contact forces occur when objects are touching each other.
Venn diagram - A Venn diagram is a way of displaying how you group items. It is made up of overlapping circles.