[Part 3]- P9- motion 🚲

Question 1

What is acceleration ?

Hint: change in velocity…

Answer 1

• acceleration, [of an object] is the change in its velocity, over a given time

Question 2

What is deceleration ?

Hint: per second

Answer 2

• deceleration is the change of velocity per second, when an object slows down [deceleration has a negative value]

Question 3

What’s the difference between acceleration 🆚 deceleration ?

Answer 3

• the acceleration, [of an object] is the change in its velocity, over a given time
• ; deceleration is the change of velocity per second, when an object slows down [deceleration has a negative value]

Question 4

What does the gradient of a velocity-time graph, tell us ?

Answer 4

• the gradient of a velocity-time graph, tells us the acceleration of the object

Question 5

In a velocity-time graph, what does a horizontal line mean ?

Answer 5

• in a velocity-time graph, a horizontal line means the object is travelling at a constant velocity

Question 6

What does an upward sloping line, in a velocity-time graph mean ?

Answer 6

• in a velocity-time graph, an upward sloping line means the object is accelerating

Question 7

What does a downwards sloping line, in a velocity-time graph mean ?

Answer 7

• in a velocity-time graph, a downwards sloping line means the object is decelerating

Question 8

What does the total area under a velocity-time graph, tell you ?

Hint: in a specific direction

Answer 8

• the total area under a velocity-time graph, tells us the distance traveled, in a specific direction [also known as displacement]

Question 9

• Fill in the gaps: when we see constant ____________ or deceleration, we can simply divide the velocity-time graph into ______ and calculate their total ____

Answer 9

• when we see constant acceleration or deceleration, we can simply divide the velocity-time graph into shapes, and calculate their total area

Question 10

Fill in the gaps: If the acceleration and _____________ in a velocity-time graph isn’t constant, count the _______ , to calculate the total ____ under the graph.

Answer 10

• If the acceleration and deceleration in a velocity-time graph isn’t constant, count the squares, to calculate the total area under the graph.

Question 11

What happens when an object, falls towards the surface of the Earth ?

Hint: accelerates at…- why?

Answer 11

• when any object falls towards the surface of the Earth, it initially accelerates at around 9.8m/s^2
• this acceleration is due to the force of gravity, which acts on the object.