Mechanics 3:Topic 1.6-1.8

Two boys X and Y each have the same total weight and are standing on soft ground. 
Which boy is more likely to sink into the soft ground and why? 

• A
• B
• C
• D

A pin is squeezed between finger and thumb. 
Which statement is correct?

• The force of the pin is larger on the finger than on the thumb. 
• The force of the pin is larger on the thumb than on the finger. 
• The pressure of the pin is larger on the finger than on the thumb. 
• The pressure of the pin is larger on the thumb than on the finger. 

Liquid X has a density of 1010 kg/m³. Liquid Y has a density of 950 kg/m³. The liquids are poured into tubes as shown.
Which tube has the greatest pressure on its base? 

• A
• B
• C
• D

Which line in the table gives an example of the stated form of energy?

• A
• B
• C
• D

A pressure is measured using a manometer as shown in the diagram. 
The water in the manometer is replaced with a liquid which is more dense. How does the value of h change? 

• It becomes zero. 
• It decreases, but not to zero. 
• It stays the same. 
• It increases. 

A person uses chemical energy to run up some stairs. She stops at the top of the stairs.
What has the chemical energy been converted to when she is at the top of the stairs? 

• kinetic energy and gravitational energy
• kinetic energy and strain energy
• gravitational energy and heat energy 
• strain energy and heat energy 

The diagram shows a simple mercury barometer, used to measure atmospheric pressure. 
Atmospheric pressure increases.
What happens to the level L and to the pressure at P? 

• level L - falls
  pressure at P - increases
• level L - falls
  pressure at P - stays the same
• level L - rises
  pressure at P - increases
• level L - rises
  pressure at P - stays the same

Two cars have different masses and different speeds as shown. 

How do the momentum and the kinetic energy of the two cars compare? 

• A
• B
• C
• D

One side of a cube stands on the ground. 
The cube weighs 200 N and its sides are 0.10 m long. How much pressure does the cube exert on the ground?

• 2.0Pa
• 20Pa 
• 2000Pa 
• 20 000Pa 

Which unit is used to measure work? 

• joule
• kilogram
• newton
• watt