half-term 1- Forces Flashcards
types of forces
magnetism gravity friction (generates heat) upthrust air resistance electrostatic reaction force weight drag
contact forces
A contact force is any force that requires contact to occur. e.g. Friction, upthrust
non-contact forces
A non-contact force is a force which acts on an object without coming physically in contact with it. e.g. magnetism, gravity, electrostatic
effect of forces
- change speed
- change direction
- change shape
equation for force
mass x accelaration
balanced force
if the forces on an object are balanced the object will remain stationary or continue to do what it was doing without any change, so if it is moving, it will continue to move at the constant speed.
mass
The amount of matter that makes up an object, the mass of an object, will always be the same. (kg)
weight
A force due to the pull of gravity on an object, the weight of an object will vary depending where in the universe. (N) gravity= 10N
equation for weight
mass x gravity
equation for speed
distance/time
what is used to measure force
newton meter
what does arrows on a force diagram show
We can show the forces acting on an object using a force diagram. In a force diagram, an arrow represents each force, the size of the force (the longer the arrow, the bigger the force) the direction in which the force acts.
two things that friction does to an object
Friction works against the motion and acts in the opposite direction. When one object is sliding on another it starts to slow down due to friction. generates heat.
unbalanced force
Forces that cause a change in the motion of an object are unbalanced forces. Unbalanced forces are not equal and opposite.
calculate the force required to accelerate a mass of 50kg at 3 m/s2
50 x 3= 150N
