Drawing distance, speed, acceleration vrs time graphs NB: The slope of the ramp must stay constant and should be small ramp trolley mask LG1 LG2 1.Distance.

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Drawing distance, speed, acceleration vrs time graphs NB: The slope of the ramp must stay constant and should be small ramp trolley mask LG1 LG2 1.Distance verse time The light gates should be connected to a QED set to gap time. This measures the time between LG1 and LG2. Find this time at 5 different distances and draw a graph. time distance

2. Speed verses time Use one light gate and set QED to instantaneous speed. Measure the speed at the same distances down the ramp as before. This will allow you to draw a speed time graph. 3. Acceleration verses time Use one light gate and the double mask. Measure the acceleration at the same distances down the ramp as before. This will allow you to draw an acceleration time graph. time speed

play

Projectiles The only force which acts on a projectile is the force due to gravity ( weight) v v We need to resolve the velocity into its horizontal and vertical components

t vHvH t v Horizontal velocityVertical velocity Down + ve No force in horizontal direction so constant velocity Weight acts downward so accelerates at 9.8 m/s 2 down

Example A car travelling with a horizontal speed of 20 m/s goes off the top of a cliff. It lands 30 m from the foot of the cliff (i) How high was the cliff? (ii) What was the car’s velocity just before it hit the ground ? Tutorial questions page 31/32 Qu 1 to 3 Purple book Ex 1.4 Extra question satellite

Example A basket ball player throws the ball at 60 0 to the horizontal with an initial speed of 5 ms -1 (a) Calculate the initial horizontal and vertical components of velocity. (b) The maximum height of the ball above its initial position. (c) The horizontal range. Tutorial page 32 to 35 Qu 4 to 12 Purple book Ex 1.5

Estimate your take off velocity in a standing long jump. Step 1 Vertical jump Measure maximum vertical displacement, s v Calculate initial vertical velocity, u v and then the time for jump, t. Step 2 standing long jump s h maximum horizontal distance assume you stay in the air for the same length of time as your vertical jump ie u v and t will be the same as step 1. Calculate the horizontal velocity, v H Step 3 calculate take off velocity from u v and u H Do you think the assumption in step 2 is justified? If not, is the calculated value for horizontal velocity too big or too small? The world record for the standing long jump is 3.71 m