Teaching Forces. Background knowledge for teachers. NEWTON’S LAWS OF MOTION. 1. An object will stay at rest, or move at a constant speed, unless acted upon by an unbalanced force.
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Background knowledge for teachers
1. An object will stay at rest, or move at a constant speed, unless acted upon by an unbalanced force.
2. The acceleration of an object acted upon by an unbalanced force is directly proportional to the magnitude of the force and inversely proportional to its mass.
3. To every action force there is an equal and opposite reaction force.
Newton’s laws can confuse learners. The following slide provides simple explanations of Newton’s Laws of Motion.
At primary it is good for children to experience and discuss the effects of forces.
1. Balanced forces cause objects to stay at rest or travel at a constant speed.
A bullet travelling through space just keeps
2. Unbalanced Forces cause objects to speed up or slow down.
I’d rather push a Mini than a 4X4!
3. To every Action Force there is an equal and opposite Reaction Force.
If you shove me I’ll shove you back
(at the same time)!
An object which does not move has no forces acting on it.
Try strings and arrows!
Which forces are acting on
With a difficult concept such as upthrust
from a table it can be useful to get learners
to think about examples they can visualise
e.g. a nail pushing up on a string, water pushing up on a boat.
Different types of forces should be explored with learners. They need hands on opportunities to experience and investigate these and think about and discuss their ideas about everyday examples.
Therefore, the Moon can’t have Gravity because it doesn’t have an atmosphere.
Learners commonly have misconceptions
about gravity e.g. The Earth has gravity
because it has an atmosphere.