forces - 1.3 Flashcards
(9 cards)
1
Q
equation for force
A
Force (N) = mass (kg) x acceleration (m/s²)
2
Q
equation for weight
A
Weight (N) = mass (body weight in kg) x acceleration (due to gravity is 10 m/s²)
3
Q
define reaction force
A
force exerted back against a body from the surface it is in contact with
4
Q
what are the two vertical forces?
A
weight and reaction force
5
Q
what are the two horizonatal forces?
A
friction and air resistance
6
Q
what are the 4 factors that effect friction ?
A
- Roughness of ground surface
- Roughness of contact surface
- Temperature - eg warming car tires in motor sport
- Size of normal reaction - heavier person has more friction
7
Q
define air resistance
A
force that opposes the motion of a body travelling through the air.
8
Q
define friction
A
opposes the sliding motion
9
Q
name the five factors affecting air ressitance
A
- velocity
- mass (mass = greater momentum)
- frontal cross sectional area
- streamlining
- surface characteristics
