Motion

Question 1

Definition of distance

Answer 1

• Scalar quantity
• A measure of how far an object moves

Question 2

Definition of displacement

Answer 2

• vector quantity
• total distance in a direction

Question 3

Definition of speed

Answer 3

• Scalar quantity
  The rate of change of distance

Question 4

Definition of velocity

Answer 4

• vector quantity
• The rate of change of displacement of an object

Question 5

If a car drives in a circle/loop what is the total displacement?

Answer 5

0 because it finishes back at the original point

Question 6

What is instantaneous velocity

Answer 6

The gradient in a displacement-time graph (velocity at a particular point in time)

Question 7

Definition of acceleration

Answer 7

Rate of change of velocity

Question 8

SUVAT EQUATIONS

Answer 8

v = u + at
v ² = u ² + 2as
s = ut + 1/2at ²
s = 1/2(u+v)t

S=Displacement
V=Final Velocity
U=Initial Velocity

Question 9

When would you use SUVAT equations?

Answer 9

Only when acceleration is constant

Question 10

What is the vertical acceleration of a falling object?

Answer 10

9.81

Question 11

What is the vertical acceleration when an object is thrown up

Answer 11

-9.81

Question 12

What is an objects vertical velocity at max height?

Answer 12

0

Question 13

What do you need to remember when calculating the motion of a projectile?

Answer 13

That vertical and horizontal motion are completely different

Question 14

Equation for calculating velocity

Answer 14

V = △x / △t
Distance in distance (displacement) divided by changing time

Question 15

Equation for calculating acceleration

Answer 15

a = △v / △t

Question 16

How is a stationary object represented in a displacement-time graph?

Answer 16

A straight horizontal line

Question 17

How is constant velocity represented in a displacement-time graph?

Answer 17

A straight line through the origin (the gradient)

Question 18

How is accelerating represented in a displacement-time graph?

Answer 18

A positively curved line

Question 19

How is deceleration represented in a displacement-time graph?

Answer 19

A negatively curved line

Question 20

How is constant velocity represented in a velocity-time graph?

Answer 20

A straight horizontal line

Question 21

How is constant acceleration represented in a velocity-time graph?

Answer 21

A straight line through the origin (the gradient)

Question 22

How is constant deceleration represented in a velocity time graph?

Answer 22

A negative gradient - diagonal from top to bottom

Question 23

How is increasing acceleration represented in a velocity-time graph?

Answer 23

A positively curved line

Question 24

Define terminal velocity

Answer 24

The highest speed and object can reach when falling through a fluid like air or water

Question 25

How can terminal velocity be measured?

Answer 25

Using light gates connected to a timer or data locker

Question 26

What is a projectile?

Answer 26

An object thrown at an angle to the horizontal - moving in both horizontal and vertical planes

Question 27

How do you calculate the velocity of a projectile?

Answer 27

Analyse horizontal and vertical components separately and assume there’s no air resistance

Question 28

How would you calculate the initial vertical and horizontal velocities of a projectile?

Answer 28

Horizontal = Vsin0 Vertical = Vcos0 There are no forces acting in the horizontal direction therefore horizontal velocity remains constant and can be analysed through speed=distance/time Vertical velocity changes due to acceleration, therefore we must use linear motion equations (SUVAT)

Question 29

What does the velocity equal at the maximum vertical height of a projectile?

Answer 29

0

Question 30

How do you resolve the final velocity once the vertical and horizontal components are found?

Answer 30

Pythagoras theorem