Kinematics

Question 1

What does the gradient of a displacement time graph show?

Answer 1

gradient shows velocity, when gradient is zero, object is stationary.

Question 2

What does a velocity time graph show?

Answer 2

gradient shows acceleration (when gradient is zero acceleration is zero), area under the graph shows the displacement.

Question 3

What is instantaneous velocity?

Answer 3

Rate of change of velocity.

Question 4

Why would a hammer and a feather, released together, hit the floor at the same time? (Assume no air resistance)

Answer 4

Hammer weighs more than a feather, so force from gravity is larger, however inertia is larger, so acceleration is slower.

Question 5

What is inertia?

Answer 5

The reluuctantce of an object to get moving

Question 6

What is terminal velocity?

Answer 6

The constant maximum velocity of an object when the resistive forces are equal and opposite to the accelerating force.

Question 7

What is the relationship between speed and drag?

Answer 7

Drag is proportional to speed^2