Balanced force occurs if the forces on an object are the same size but in ....................................directions, then they will cancel out.

• the same

• opposite

If the resultant force is not zero the forces are balanced.

• True

• False

When the diver is floating, her weight is balanced by the upthrust of the water.

• True

• False

In an unbalanced force action, the object behaves as if there is no force acting on it.

• True

• False

If the forces acting on an object are balanced, then its motion will not change

• True

• False

If the forces acting on an object are balanced, then its motion will not change:

If it is not moving it will ...................

• keep moving at a steady speed

• stay still.

If the forces on an object are not equal and opposite, then they are ...................

• unbalanced

• balanced

If the forces are unbalanced then the motion of the object will change:

If it is not moving it will .................

• speed up (accelerate), slow down (decelerate), or change direction

• start moving

The resultant force is ............................

• zero

• zero to the left

• zero to the right

Friction and air resistance will slow down a ball kicked by a footballer. If we could remove both of these forces, then the ball would carry on travelling at a steady speed forever.

• True

• False