Force
What is the basic definition of force?
A pull or a push upon an object
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If an object has a mass of 4.56 kg on Earth, what is its weight in Newtons?
45.6 N
What is the S.I. unit used to measure force?
Newton (N)
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Name the laboratory instrument used to measure the magnitude of a force.
A spring balance
When a book rests on a table, its weight is the action force. What is the name of the reaction force produced by the table surface?
What is light and sound energy?
A duck floating on water stays afloat because its weight is balanced by which reaction force?
Buoyant force
Force is a vector quantity. Name the three characteristics that must be shown in a force diagram.
Magnitude, direction, and point of application
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When a goalkeeper catches a fast-moving ball, which effect of force is he demonstrating?
Stopping a moving object
Pressing a piece of plastisin or squeezing a sponge is an example of which effect of force?
Changing the shape and size of an object
According to Newton’s Third Law, if an action force is applied, what are the two characteristics of the reaction force?
It has the same magnitude but acts in the opposite direction
Which specific force points towards the centre of the Earth and causes objects thrown upwards to fall back down?
Gravitational Force
What type of force resists the movement between two surfaces that are in contact with each other?
Frictional Force