# Forces Flashcards

What is a force?

A force is a push or pull (or twist)

What is force measured in and what symbol do we use to represent force?

Measured in Newtons (N)

Symbol = F

What can forces change?

Forces can cause an object to change speed (decelerate or accelerate), direction or shape

What happens if a pair of forces are balanced?

The object will either: stay at rest (stationary) or continue moving in a straight line at a constant speed

How do you calculate resultant forces?

Minus the smaller number off the bigger number. eg. <===50 - 5=> =45

45N = resultant force <===

What is magnetism?

Magnetism is a field force - a non-contact force = acts over a distance. Magnets have 2 poles - a north and a south pole

What is mass?

Mass is the amount of matter that an object is made up of

What is mass measured in?

kilograms (kg) using an ordinary balance/scale

Is the mass of an object constant everywhere in the universe?

Yes

What is weight?

Weight is the force of gravity on a mass due to the pull of the Earth

What is weight measured in?

Newtons (N) using a spring balance

Does the weight of an object varie place to place depending on the force of gravity?

Yes

What is the equation to finding mass, weight and gravity?

W = m x g

m = W ÷ g

g = W ÷ m

Do opposite charges repel each other?

No they attract each other