Forces Flashcards
Which is the best way to measure a force?
The best way to measure a force is using a force meter.
Forces can be:
Forces can be both pushes and pulls, not just pulls.
What is the unit of force called?
The unit of force is the newton, N.
What can we say about the forces on an object that is not moving?
If an object is not moving, the forces must be balanced
The arrows in this diagram represent the sizes of forces acting on a stationary tennis ball. What will happen to the tennis ball?
Bearing in mind the arrows are not the same size, the bottom one is larger.
The ball in this diagram will move downwards. It would stay still if the arrows were the same size.
What happens to the air resistance on a car as the car goes faster?
As a car goes faster, air resistance increases, not decreases
A force of 4 N acts on a lever 2 m from the pivot. What is the moment?
The moment is 8 Nm. Remember: moment = force x distance from pivot.
One way to increase the turning force on a spanner is to:
One way to increase the turning force on a spanner is to use a longer spanner
Gravity is an example of what?
Gravity is an example of a non-contact force
What store of energy does friction always produce?
Friction always produces heat
