Forces recap Flashcards
What are forces?
A force can be a pull, push or twist.
What is the unit of force called?
newton, N
Name common contact forces.
Friction, Air resistance, Upthrust, Drag, Tension, Reaction, Lift, Reaction, and Thrust.
Name the only 3 non-contact forces.
Weight, Magnetic force, and electrostatic force.
What can we say about the forces on an object that is not moving?
The forces are balanced.
A force of 4 N acts on a lever 2 m from the pivot. What is the moment?
moment = force x distance so 8.
One way to increase the turning force on a spanner is to:
Use a longer spanner.
What store of energy does friction always produce?
Heat.
What is lubrication?
The action of adding a substance such as oil or grease to reduce friction for smooth movement.
What are interaction pairs?
A force pair, composed of two forces that are opposite in direction and equal in magnitude.
What is used to represent forces in diagrams?
Arrow
When a force is applied to an object what can it change the object?
Speed, the direction of movement, shape (for example, an elastic band gets longer if you pull it.
What does hookes law state?
Hooke’s law is a law of physics that states that the force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance
