Flashcards in Forces and Motion Deck (53)
What is the equation for speed?
speed = distance/time
What is the equation for weight?
weight = mass x gravity
What is the equation for acceleration?
acceleration = change in velocity/time
What is the relationship between force, mass, and acceleration?
force = mass x acceleration
What does the gradient in a distance time graph represent?
What does the gradient in a velocity time graph represent?
What does a curving line represent on a distance time graph?
What does a curving line represent on a velocity time graph?
increasing acceleration / deceleration
What does a horizontal line represent on a distance time graph?
What does a horizontal line represent on a velocity time graph?
What IS acceleration?
the rate of increase of velocity with time
Why do objects reach terminal velocity?
when an object has the balanced forces of air resistance and weight on it. It falls at a constant speed. The two examples are a sky diver and sycamore seeds.
How do you find distance from a velocity time graph?
area under graph
What is the unit for velocity?
What is the unit for acceleration?
What is the unit for force?
What is the unit for momentum?
What is the unit for volume?
What is the fancy unit for temperature?
What is the difference between a vector and a scalar quantity?
a vector quantity has both direction and magnitude, where as a scalar quantity just has magnitude.
What IS friction?
the force which opposes motion
Use ideas about molecules to explain how pressure is caused inside an object.
Any three of
MP1. idea of (continuous) random
MP2. collisions / impact/eq;
MP3. with (inside) walls;
MP4. idea that force is produced (by
MP5. idea of pressure as force on an
What is the equation for gravitational potential energy?
gravitational potential energy = mass x gravity x height
What is the equation for refractive index?
n = sin i/ sin r
What is Newton's third law of motion?
for every action, there is an equal and opposite reaction
What does stopping distance consist of?
thinking distance = braking distance
What 2 things affect thinking distance?
- state of driver (eg. old age, tiredness, dugs, alcohol, inexperience?
What 4 things affect breaking distance?
- mass of vehicle
- quality of brakes
- grip (road surface, weather, tyres)
What is the equation for momentum?
momentum = mass x velocity