S2 2026 Chapter 9 - Forces [27Q]
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27 Terms
1 m/s = ___km/h
3.6
Formula for gravitational force or weight
W = mg
SI unit for gravitational force or weight (W)
N (Newton)
SI unit for mass, m
kg
SI unit for gravitational field strength, g
N/kg
SI unit for force
N (Newton)
Definition of friction
Friction is the force that opposes motion between two surfaces in contact.
Definition of elastic force
Elastic force is the force acting on a stretched or compressed elastic object to return it to its original shape.
Definition of magnetic force
Magnetic force is the force exerted between a magnet and another magnetic material.
Types of contact forces
Friction, elastic force
Types of non-contact forces
Gravitational force, magnetic force
Definition of weight
Weight is the measure of the gravitational force acting on an object.
SI unit of weight is the same as for…
force
Definition of mass
Mass is the amount of matter in an object.
Formula for pressure
Pressure = Force/Area
SI unit for pressure
Pascal, Pa
SI unit for area
m2
Formula for work done
Work done = Force x distance moved in the direction of the force
Definition of work done
Work done by a force on an object is the product of the force and the distance moved by the object in the direction of the force.
SI unit of Energy
J (Joule)
Energy cannot be ___ or ____ but can be ____ from ____ to ____. The ___ energy in an ___ ___ is ___.
Energy cannot be created or destroyed but can be converted from one form to another. The total energy in an isolated system is constant.
changes in the state of rest or motion of an object (4)
moving a stationary object
changing the speed of an object
changing the direction in which an object moves
stopping a moving object
Definition of pressure
Pressure is the force per unit area.
Definition of speed
Speed is the distance travelled per unit time.
Definition of kinetic energy
Kinetic energy is the energy of a body due to its motion.
Definition of gravitational potential energy
Gravitational potential energy is energy stored in a body due to its height from the ground.
SI unit for speed
m/s