Topic 3.1 Motion

Question 1

Displacement

Answer 1

The distance of an object from a point in a specific direction (vector)

Question 2

Velocity

Answer 2

Rate of change of displacement (vector) ∆s/∆t if constant

Question 3

Speed

Answer 3

Change in distance traveled per unit time (scalar)

Question 4

Acceleration

Answer 4

Rate of change of velocity (vector) ∆v/∆t if constant

Question 5

What is meant by constant/uniform motion

Answer 5

Speed and direction of motion don’t change

Question 6

What is represented by the gradient of a distance-time graph?

Answer 6

Speed

Question 7

What is represented by the gradient of a displacement-time graph?

Answer 7

Velocity

Question 8

What is represented by the gradient of a velocity-time graph?

Answer 8

Acceleration

Question 9

What is represented by the area under a velocity-time graph?

Answer 9

Change in displacement

Question 10

What is represented by the area under an acceleration-time graph?

Answer 10

Change in velocity

Question 11

When can suvat equations be used?

Answer 11

When there is constant acceleration and motion along a straight line.

Question 12

What is the effect of mass on the acceleration for an object in free-fall?

Answer 12

None

Question 13

What is the relationship between displacement and time for an object falling freely from rest?

Answer 13

Displacement is proportional to time squared (sαt2)

Question 14

What is a projectile?

Answer 14

An object acted upon only by the force of gravity

Question 15

What shape is the path of a projectile?

Answer 15

Parabolic

Question 16

What is the initial vertical velocity of an object projected horizontally?

Answer 16

Zero

Question 17

What angle of projection that results in maximum range

Answer 17

45 degrees

Question 18

Ignoring air resistance what is the acceleration of a projectile?

Answer 18

Always g downwards

Question 19

How does horizontal velocity vary in projectile motion?

Answer 19

It is constant

Question 20

If a projectile returns to its starting height…

Answer 20

Initial and final velocities have the same magnitude

Question 21

What equation used for the horizontal component of projectile motion?

Answer 21

Displacement = Velocity x time (since horizontal velocity is constant)

Question 22

What aspect links the vertical and horizontal motion of a projectile

Answer 22

Time taken to fall

Question 23

Why can SUVAT equations can be used for the vertical component of projectile motion

Answer 23

Since the motion is in a single direction with a constant acceleration

Question 24

What is the vertical velocity at the peak of projectile motion?

Answer 24

Zero