3b.2 - Pendulums

Question 1

What does the time for one pendulum swing depend on?

Answer 1

Its length

Question 2

What is the time period of the pendulum?

Answer 2

The time taken for the pendulum to swing from one side to the other and back again

Question 3

What makes pendulums good for keeping time in clocks?

Answer 3

The time period for each swing of a given pendulum is always the same

Question 4

How is time period calculated?

Answer 4

1 % frequency

Question 5

What does the time period of a pendulum depend on?

Answer 5

It’s length

Question 6

What does increasing the size of the pendulum string do to time period?

Answer 6

Increases it

Question 7

What does decreasing the size of the pendulum string do to the time period?

Answer 7

Decreases it

Question 8

What does virtually incompressible mean? (2)

Answer 8

• You can’t squash it

- Their volume and density stay the same

Question 9

What does being incompressible allow liquids to do?

Answer 9

Transmit a force to all other points in the liquid

Question 10

How is pressure transmitted in a liquid?

Answer 10

Equally in all directions

Question 11

What is pressure measured in?

Answer 11

Pascals (Pa)

Question 12

What is force measured in?

Answer 12

Newtons

Question 13

What is the main use of pressure in liquids?

Answer 13

Hydraulics systems

Question 14

What are hydraulic systems also used as?

Answer 14

Force multipliers

Question 15

What is a force multiplier?

Answer 15

Something that uses a small force to produce a bigger force

Question 16

How do hydraulic systems work? (4)

Answer 16

• Two pistons, each with a different cross-sectional area
• At the first piston, pressure is exerted using a small force
• Pressure transmitted to second piston
• The piston has a larger area (force = pressure x area), so there will be a larger force

Question 17

What is constantly changing when a object is spun in a circle?

Answer 17

Velocity

Question 18

What is velocity?

Answer 18

Both the speed and direction of an object

Question 19

What is the centripetal force?

Answer 19

The resultant force that causes acceleration towards the centre of the circle

Question 20

What is the centripetal force acting on a car as it goes around a bend?

Answer 20

Friction

Question 21

What is the centripetal force acting on a bucket as it spun in a circle on a rope?

Answer 21

Tension in the rope

Question 22

What does the centripetal force depend on?

Answer 22

• Mass
• Speed
• Radius

Question 23

If an object moves faster what will happen to the centripetal force?

Answer 23

Increase to keep it moving in a circle

Question 24

If the mass of the object increases what will happen to the centripetal force?

Answer 24

Bigger to keep it moving in a circle

Question 25

If the circle the object travels in is reduced in size, what will happen to the centripetal force?

Answer 25

Increases as it has more turning to do