P5: Quiz 10
1)
a) Give a definition for acceleration.
b) An object is accelerating in the direction that it is travelling in. How will this change the velocity of the object?
c) An object is decelerating in the direction that it is travelling in. How will this change the velocity of the object?
d) We have a negative value for the acceleration of an object. What does a negative value for acceleration mean?
e) What are the units for acceleration?
2) Write down the equation that links acceleration, change in velocity and time taken.
3) It takes a car 6 seconds to accelerate uniformly from rest to 24 m/s. Find the acceleration rate.
4) A car has an initial velocity of 5 m/s. The car then accelerates uniformly and after 9 seconds the car reaches a velocity of 27.5 m/s. Work out the acceleration rate of the car.
5) A motorbike is slowing down as it approaches a school. The bike slows down from 21 m/s to 6 m/s. It takes him 3 seconds to slow down.
a) Find the acceleration rate.
b) Comment on your value.
6) A car accelerates uniformly at an acceleration rate of 1.5 m/s2. The car has an initial velocity of 7 m/s and a final velocity of 19 m/s. Calculate the time that it takes for the car to accelerate from 7 m/s to 19 m/s.
7) Write down the equation that links initial velocity, final velocity, acceleration and distance travelled (the equation also contains the number 2).
8) A car has an initial velocity of 6 m/s. It then accelerates uniformly at a rate of 3 m/s2 to reach a final velocity of 24 m/s. Find the distance that the car covers.
9) A car has an initial velocity of 9 m/s. It then accelerates uniformly at a rate of 1.5 m/s2. Whilst the car is accelerating, it covers 120 metres. Work out the final velocity of the car.
10) A speed boat is slowing down as it enters a harbour. The initial velocity of the speed boat is 23 m/s. The speed boat decelerates at a rate of 3 m/s2 and it covers 68 metres whilst decelerating. Find the final velocity of the speed boat.
11) A runner is practicing his starts for a 100 metre race. He starts from rest and reaches a final velocity of 7.3 m/s. Whilst accelerating, he covers 22.2 metres. Work out the acceleration rate of the runner. Give your answer to 2 significant figures.
12) A train slows down as it passes a road crossing on the train tracks. The train decelerates uniformly at a rate of 1.6 m/s2. After decelerating, the train has a velocity of 29 m/s. Whilst decelerating, the train covers 1.9 km. Find the initial velocity of the train. Give your answer to 3 significant figures.
13) An object has an initial velocity of 19.6 m/s. It then decelerates uniformly at an unknown rate. The object covers 129 metres whilst it is decelerating. After decelerating, the object has a velocity of 6.2 m/s. Find the deceleration rate of the object.
14) What is the acceleration due to gravity on earth?