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Force
- A push or pull on an object is a force
- To move an object, push or pull it
- Force has a direction
- Used in lifting, twisting, pressing
- A force arises from an interaction
- push the handle away to open
- pull the handle towards to close
- both are forces
- man interacts with the car
- a force acts on the car
- the car begins to move
- Interaction means a reciprocal action between two objects.
- At least two objects must interact for a force to act.
- The direction in which an object is pushed or pulled is the direction of force.
Magnitude and Direction of Force
- A force can be large or small
- Its strength is its magnitude
- Magnitude is measured in newton (N)
- A force also has a direction
- Two forces add or cancel out
- two men push a box together
- forces add up
- the box moves easily
- two teams pull equally
- equal and opposite forces
- net force is zero, rope still
- Forces in the same direction add; opposite forces give the difference.
- Equal and opposite forces give a net force of zero, so the object stays still.
- 1 newton can make a 1 kg object move at a speed of 1 metre per second.
Name the following: The push or pull on an object.
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Explanation
- A force makes an object move, stop or change shape.
Name the following: The unit of force.
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Explanation
- The SI unit of force is the newton, written as N.
Fill in the blank: If the two forces applied on an object are equal and act in opposite directions, the net force acting on the object will be ________.
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Explanation
- Equal and opposite forces cancel out, so the object does not move.
Fill in the blank: Force could be a ________ or a ________.
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Explanation
- A force is either a push or a pull on an object.
Fill in the blank: Force has magnitude as well as ________.
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Explanation
- Both the strength and direction of a force matter.
Fill in the blank: A force arises due to ________ between two objects.
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Explanation
- At least two objects must interact for a force to come into play.
Identify the action as push or pull, or both: opening a drawer.
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Explanation
- We pull the drawer towards us to open it.
Identify the action as push or pull, or both: a cricket ball hit by a batsman.
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Explanation
- The bat pushes the ball, sending it in another direction.
Identify the action as push or pull, or both: drawing a bucket of water from a well.
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Explanation
- We pull the rope upwards to draw the bucket out of the well.
Identify the action as push or pull, or both: moving a book placed on a table.
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Explanation
- We can move a book on a table either by pushing it or by pulling it.
Identify the action as push or pull, or both: a football player taking a penalty corner.
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Explanation
- The player's kick pushes the ball forward.
Identify the action as push or pull, or both: moving a wheel barrow.
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Explanation
- A wheel barrow can be moved by pushing it forward or pulling it.
