Mechanics

Question 1

When are all of an objects forces at equilibrium (resultant=0)

Answer 1

Either:
At rest
Constant velocity

Question 2

What must the moments be if an object is in equilibrium

Answer 2

Clockwise moment=anticlockwise moment

Question 3

Whats a couple?

Answer 3

Pair of equal and opposite forces (coplanar) acting on a body

Creates a turning effecy

Question 4

What does negative displacement mean

Answer 4

Opposite direction

Question 5

Whats the gradient in a displacement-time graph

Answer 5

Velocity

Question 6

What does a curved line mean in a displacement-time graph

Answer 6

Acceleration

Question 7

How do you find instantaneous velocity at a particular time on a displacement-time graph

Answer 7

Draw a tangent and find the gradient

Question 8

Whats the gradient in a velocity Time graph

Answer 8

The acceleration

Question 9

Whats a curved line in a velocity time graph

Answer 9

Changing acceleration

Question 10

How is instantaneous acceleration found in a velocity time graph

Answer 10

Draw tangent and find gradient

Question 11

Whats the area under a velocity time graph

Answer 11

The objects displacement

Question 12

Whats the area under the graph of an acceleration time graph

Answer 12

Change in velocity

Question 13

What does a value of 0 mean in an acceleration-time graph

Answer 13

Constant velocity

Question 14

What letter represents initial velocity

Answer 14

U

Question 15

What letter represents final velocity

Answer 15

V

Question 16

Whats the acceleration in any projectile

Answer 16

9.81

Question 17

What does acceleration due to gravity affect in a projectile

Answer 17

Only the vertical motion

Question 18

What is ‘a’ in us at equations involving projectiles

Answer 18

9.81

Question 19

Whats the acceleration if the vertical component of a projectile moves down

Answer 19

-9.81

Question 20

Whats the initial velocity if an object is dropped vertically

Answer 20

0