Flashcards
OCR Gateway Physics P3 flashcards
Cards in this deck (33)
- 1Speed can be measure in..... [3]#metres per second
#kilometres per hour
#miles per hour - 2The faster the speed of an object: [2]the greater the distance it travels in a particular time
the shorter the time it takes to travel a particular distance - 3How to calculate speed?distance (m)
speed = ____________________ (m/s) time (s) - 4Why is the average speed used?The speed may change over a given distance, so an average distance over the whole journey is used
- 5How to work out average distance?Distance = (u + v) * t
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2 - 6Example question: Calculate the distance a car travels in 90 minutes if it's travelling at a constant speed of 80 km/h ?distance = speed * time
= 80 km/h * 1.5 hours
= 120 km - 7How do speed cameras work?They generally take 2 pictures of a vehicle a certain amount of time apart. the position of the vehicle in relation to the distance markings on the road in the 2 pictures can be used to calculate the vehicle's speed
- 8What is the formula for measuring the speed of a vehicle on a speed camera?speed of car = distance travelled between pictures / time taken between 1st and 2nd picture
- 9(Distance-time graphs) The steeper the gradient....the greater the speed
- 10distance - time graphs) a straight diagonal line shows...a constant speed
- 11(distance-time graphs) a straight horizontal line shows.....No movement (stationary)
- 12(distance-time graphs) a steeper diagonal line means....an increase in speed (object is going faster than it was before)
- 13(distance-time graphs) a diagonal line going downwards means....object is going backwards
- 14How do you work out the speed of an object on a distance-time graph?take any 2 points on the graph and read off the distance travelled for that part of the journey and the time taken to get there
- 15The acceleration / deceleration of an object is..... ?the change in speed per second
- 16How do you measure acceleration and deceleration?acceleration = metres / second squared
deceleration = -metres / second squared - 17How do you work out the acceleration of a moving object?acceleration = (final velocity - initial velocity) / time
- 18Example question: A car accelerates at 1.5 m/s2 for 12 seconds. Calculate the change in speed of the carchange in speed = acceleration * time taken
=1.5 m/s2 * 12
= 18 m/s - 19(speed-time graphs) a horizontal line means...No acceleration (0 m/s2)
- 20(speed-time graphs) a positive diagonal line shows....acceleration
- 21(speed-time graphs) a negative diagonal line shows..deceleration
- 22(speed-time graphs) the area underneath the speed-time can be used to measure....distance travelled
- 23How would you calculate the total distance travelled on a speed-time graph?Cut the graph into triangles and rectangles, then find the area for each shape and add them all up. REMEMBER!
area of rectangle = width * height
area of a triangle = 1/2 * base * height - 24What is Force measured in?Newtons
- 25Forces can cause objects to....?accelerate
- 26Weight causes an object to have.... ?gravity
(weight can also be called gravity) - 27How does friction affect a car?it slows it down
- 28What happens when a sky diver opens up a parachute mid-jump?Air resistance - Air resistance causes the skydiver to slow down A LOT when the parachute opens.
- 29What happens to a sky-diver mid-jump when air resistance and weight are balanced?they stay at a constant speed
- 30if an unbalanced force acts, the acceleration of an object will depend on: ? [2]#the force applied to the object
#the mass of the object - 31more force = ... ?= more acceleration
- 32more mass = ... ?= less acceleration
- 33What is the formula for the relationship between force, mass and acceleration force (N) = .... ?= mass (kg) * acceleration (m/s2)
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- Flashcards on OCR Gateway Physics P3 flashcards, created by xhallyx on 09/12/2014.
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