Forces (Seneca) Flashcards
Scalar quantities only have a …
magnitude (size).
Speed is a ——— quantity.
scalar
Scalar quantities, like speed, do not have a …
direction
Velocity describes …
an object’s direction as well as its speed.
Velocity is a vector quantity because …
it has a magnitude (or size) and a direction.
The average speed (measured in metres per second, m/s) is equal to the …
distance travelled (metres, m) divided by the time taken (seconds, s).
Average speed =
total distance / total time
If two people stand back-to-back and walk away from each other at the same speed, but in opposite directions, their speeds are the same but …
one will have a positive velocity and the other will have a negative velocity.
Velocity describes an object’s ———- as well as its speed.
direction
————- theorem is used to work out the resultant force.
Pythagoras’
Acceleration =
Change in velocity / time taken
Displacement is the …
distance an object moves in a straight line from a starting point to a finishing point.
Displacement is a ——— quantity.
vector
Distance is a ———- quantity.
scalar
Distance is …
how far an object moves.
A force is a …
push or a pull that acts on an object when it interacts with another object.
All forces between objects are either:
- Contact forces
- Non-contact forces
Contact forces happen when …
two objects are physically touching.
———- are all examples of contact forces.
Friction, air resistance, tension and normal contact force
Non-contact forces happen when …
objects are separated (not touching).
———— are all examples of non-contact forces.
Gravitational force, electrostatic force and magnetic force
Tension is …
the pulling force that a string or cable exerts (creates) when something or someone pulls on it.
When you push on a table, your hand doesn’t move through it.
This is because …
the normal contact force from the table pushes equally on your hand.
Air resistance comes about when …
an object moves through the air and collides with (hits) air molecules.