What is Force?

What is the role of Karl in his soccer team?

• Goalkeeper

• Striker

• Midfielder

• Defender

How is the size of a force measured in science?

• In newtons (N)

• In pounds (lbs)

• In kilograms (kg)

• In meters (m)

If Karl kicks the ball with a force of 190 newtons upwards and to the right, what does this indicate about the force?

• The force has both strength and direction

• The force is only strong

• The force is only in one direction

• The force is weak

What is a contact force?

• A force exerted through touch or contact

• A force that acts without touching

• A force that only acts on liquids

• A force that only acts on gases

Which of the following is an example of a non-contact force?

• Gravity

• Pushing a door

• Pressing piano keys

• Pulling a rope

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How does a pianist apply force to play a song?

• By pressing down on the piano keys

• By waving hands over the piano

• By using a remote control

• By clapping hands

What type of force is applied when opening a door?

• Contact force

• Non-contact force

• Magnetic force

• Gravitational force

Every force has both __________ and __________.

• 
  a strength; a direction

• 
  a movement; an object

• 
  a strength; a size

• 
  a direction; a volume

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Decide if the arrow shows a contact force or a non-contact force.

Groups:

(a) Contact Force

,

(b) Non-Contact Force

• 
• 
• 

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A contact force acts directly on an object by touching it. A non-contact force does not have to touch an object to affect it. The floor is exerting a ​ (a)   upward on the man doing a handstand. Gravity is exerting a downward ​ (b)   on the plane. The magnet is pulling the metal ball with a non-contact force.

• non-contact force
• contact force

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