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.