# Forces Flashcards

1
Q

What is a force?

A

A force is a push or pull (or twist)

2
Q

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

A

Measured in Newtons (N)
Symbol = F

3
Q

What can forces change?

A

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

4
Q

What happens if a pair of forces are balanced?

A

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

5
Q

How do you calculate resultant forces?

A

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

6
Q

What is magnetism?

A

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

7
Q

What is mass?

A

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

8
Q

What is mass measured in?

A

kilograms (kg) using an ordinary balance/scale

9
Q

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

A

Yes

10
Q

What is weight?

A

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

11
Q

What is weight measured in?

A

Newtons (N) using a spring balance

12
Q

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

A

Yes

13
Q

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

A

W = m x g
m = W ÷ g
g = W ÷ m

14
Q

Do opposite charges repel each other?

A

No they attract each other