Work And Time Flashcards
What are the units for energy?
Joules
How is energy transferred to a light bulb?
By electricity
How is energy transferred away from a light bulb?
By light, heat
Describe one other way in which energy can be transferred
By sound, forces
What is a force?
A push or a pull
What are the units for measuring force?
Newton’s
What is your weight?
The force of gravity pulling on you
What does work done mean in physics?
Energy transferred by a force
What does power measure?
How fast energy is transferred
What are the units for power?
Watts
What are the units for work done?
Joules
How do you calculate work done?
Force x distance moved in the direction of the force
How do you calculate power?
Work divided by time
Name two non contact forces
Gravity, magnetism
What is a magnetic field?
The space around a magnet where it can affect things
What is a vector quantity ?
A quantity that had both magnitude and direction
Name two contact forces
Upthrust, air resistance
Name three non- contact forces
Magnetism, gravity, static electricity
How is a force represented in a diagram?
Arrow showing direction, with length indicating size
Why is weight a vector quantity?
It has a direction as well as magnitude
The earth attracts the moon via gravity. What is the other force in this action-reaction pair?
The moon attracting the Earth
What is the name for the space around an object where it attracts things with mass?
A gravitational field
What is the name for the space around something with an electric charge where it can affect other objects?
An electrostatic or electric field
What is the name for a single force that represents the combined effects of all the forces on an object?
A resultant force
What is the name for a diagram where a measurement on the diagram represents a larger measurement in real life?
A scale diagram
