Hydraulics, Circular Motion, The Pendulum

Question 0

Explain the following:

1: When you do a handstand, the pressure on your hands is greater than the pressure on your feet when you stand upright.
2: A sharp knife cuts more easily than a blunt knife.

Answer 0

Pressure=force/area

When the area is decreased (by standing on hands, using a sharp knife) so does the pressure

Question 1

Think of as many hydraulically operated machines as possible!

Answer 1

Examples include:
Mechanical Diggers
Car Jacks
Hydraulic Lifts

Question 2

What is Pressure? Also, what is the unit of pressure?

Answer 2

Pressure is the force divided by the area which the force acts on. The unit of pressure is the pascal (pa) which is equal to 1 N/m²

Question 3

How does pressure in a fluid behave?

Answer 3

Acts equally in all directions

Question 4

Do you understand how hydraulic systems work?

Answer 4

Go revise it, you need diagrams to explain effectively, :3

Question 5

Match each situation with the type of force that causes the circular motion.

electrostatic force, friction, gravity, pull (tension)

1: A car travelling round a bend
2: A stone being whirled around on the end of a string
3: A planet moving around the sun
4: An electron orbiting the nucleus

Answer 5

1: Friction between the tyres and the road
2: Pull (tension)
3: Gravity
4: Electrostatic force

Question 6

Replace the missing words with these words:
decrease, increase, stay the same

1: The time period of a simple pendulum will ________ if it’s length is made longer
2: If a playground swing in motion is not pushed repeatedly, the amplitude of its motion will gradually ________
3: If the bob of a simple pendulum is replaced by a bob of a smaller mass and the pendulum length is unchanged the time period will ________

Answer 6

1: increase
2: decrease
3: stay the same

Question 7

How is the time period of a pendulum measured?

Answer 7

Measure the average time for 20 oscillations and divide the timing by 20.