Forces (5) Flashcards
1
Q
What is a vector quantity
A
- vector quantities have magnitude and direction (force, velocity, displacement, acceleration, momentum)
2
Q
What is a scalar quantity
A
- only have magnitude and no direction (speed, distance, mass, temperature, time)
3
Q
What is a contact force
A
- when two objects have to be touching for a force to act (friction, air resistance, tension in ropes)
4
Q
What is a non-contact force
A
- if the objects do not need to be touching for the force to act (magnetic force, gravitational force, electrostatic force)
5
Q
What is newtons third law
A
- when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction
6
Q
What is mass
A
- The amount of matter an object contains. Mass is measured in kilograms (kg) or grams (g).
7
Q
What is weight
A
The force acting on an object due to the pull of gravity from a massive object like a planet. The force acts towards the centre of the planet and is measured in newtons (N).
- this depends on the strength of the gravitational field at the location of the object (weight of an object changes with its location)
8
Q
What is a reaction force
A
- An object at rest on a surface experiences reaction force. For example, a book on a table.
9
Q
What is tension
A
- An object that is being stretched experiences a tension force. For example, a cable holding a ceiling lamp.
10
Q
What is friction
A
- Two objects sliding past each other experience friction forces. For example, a box sliding down a slope.
11
Q
What is air resistance
A
An object moving through the air experiences air resistance. For example, a skydiver falling through the air.
12
Q
What is the formula for weight
A
- Weight (N) = Mass (kg) x Gravitational field strength (N/kg)
13
Q
What is the resultant force
A
- the overall force acting on an object
14
Q
What is work done
A
- when Energy transferred by a force. Work done = force × distance moved in the direction of the force.
