Topic 2 Motion and Forces Flashcards
Q – What is the equation for acceleration?
A – acceleration = change in velocity / time
Q – What is the equation for distance using average speed?
A – distance = average speed x time
Q – What is the difference between a scalar and a vector?
A – Scalars only have magnitude whilst vectors have magnitude and direction
Q – Name 3 vectors
A – Momentum / Accel / Displacement / Force / Velocity
Q – what do the symbols in the following equation stand for….
v2 – u2 = 2 a x
A – v = final velocity / u = initial velocity / a = accel / x = distance
Q – What does the AREA under a speed-time graph represent?
A – Distance travelled
Q – What does a horizontal line on a distance-time graph represent?
A – Stationary – not moving.
Q – What does the gradient of a velocity-time graph equal?
A – the acceleration of the object.
Q – What is the value for the acceleration due to free-fall. This is also the strength of gravity
A – g = 10m/s or 10N/Kg
Q – What does Newton’s 1st law state?
A – if the resultant force on an object is zero then the object will not move or move at constant velocity
Q – What is the equation for Newton’s 2nd law of motion involving force, mass and accel?
A – Force = mass x aceleration
Q – What is the equation for weight?
A – Weight = mass x gravity
Q – What happens to my weight and mass if I travelled to the moon?
A – mass is the same but weight becomes smaller, because gravity is weaker on the moon.
Q – If something is moving in a circle at constant speed (like the Earth orbiting the Sun), then is he velocity also constant? Explain
A – No – velocity is changing because it is a vector and so have direction. As the Earth orbits the Sun it’s direction is constantly changing
Q – What is ‘braking distance’?
A – the distance travelled whilst the brakes are applied until a car finally stops
