forces Flashcards
1
Q
what is a contact force
A
forces that are physically touching each other.
2
Q
Name 3 examples of contact forces
A
- Tension
- Friction
- Air resistance
3
Q
What is a non contact force
A
forces that are not physically touching each other.
4
Q
Name 3 non contact forces
A
- Magnetic force
- Electrostatic force
- Gravitational force
5
Q
what is a force
A
A force is a push or pull
6
Q
What is the unit of force
A
Newton (N)
7
Q
How can friction be increased
A
create a rougher surface for objects
8
Q
how can friction be reduced
A
by applying oil
9
Q
Name an example where friction is useful
A
Brakes on a car
10
Q
Give an example where friction is not useful
A
Engines and machinery
11
Q
Define pressure
A
The amount of force pushing on an area
12
Q
how do u calculate pressure
A
force / area = pressure
13
Q
what is the unit for pressure
A
N/m2
