Topic 1- Forces Flashcards Preview

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Flashcards in Topic 1- Forces Deck (13)
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1
Q

What are balanced forces?

A
  • When two forces acting on an object are equal in size but act in opposite directions
  • If the forces on an object are balanced (or if there are no forces acting on it) this is what happens:
  • an object that is not moving stays still
  • an object that is moving continues to move at the same speed and in the same direction
2
Q

What are unbalanced forces?

A

*When two forces acting on an object are not equal in size and act in the same direction

  • If the forces on an object are unbalanced this is what happens:
  • an object that is not moving starts to move
  • an object that is moving changes speed or direction
3
Q

Whats the difference between equal forces and balanced forces?

A

Balanced forces- same size, opposite directions

Equal forces- not specific

4
Q

What is the definition of the term equilibrium?

A

When all the forces that act upon an object are balanced, then the object is said to be in a state of equilibrium.

5
Q

Whats Hooke’s law?

A

Force is proportional to extension up to the elastic limit

F= -k ( sprint constant) x

6
Q

what can a force be used for?

A

to stretch, compress and bend objects

7
Q

what does g stand for

A

gravitational field strenth

8
Q

give the definition of mass

A

how much matter ‘ stuff’ you are made of ( measured in kg)

9
Q

give the definition of weight and the unit

A

a force caused by gravity acting on your mass ( measured in N)

10
Q

how do you calculate weight?

A

weight (N)= mass (kg)* gravitational filed strength ( N/kg)

g on Earth = 10 N/kg

11
Q

give the equation for Force

A

F=ma

12
Q

give the definition of upthrust

A

the upward force that a liquid or gas exerts on a body floating in it.

13
Q

what happens to the acceleration when the forces are balanced

A

a = 0