Mass and Weight

What is the formula of weight?

• $w=m\cdot g$

• $w=m+g$

• $w=m\div g$

A box with mass 20 kg placed on the surface of planet X with gravitational acceleration

 $0.2\ \frac{m}{s^2}$  . What is its weight?

• 20 N

• 40 N

• 4 N

1 kg book moved from earth to moon. It is known that  $g_{earth}=10\ \frac{m}{s^2}$   and

 $g_{moon}=\frac{1}{6}g_{earth}$  .Which statement is correct?

• Mass on moon is smaller than mass on earth

• Weight will be the same on both surface

• Weight on earth is 10 N and on moon only 1.67 N

Weight of a stone on planet Q is 300 N, while its mass is 60 kg. What will be planet's gravitational acceleration?

• $18000\ \frac{m}{s^2}$

• $5\ \frac{m}{s^2}$

• $0.2\ \frac{m}{s^2}$

What is the definition of mass?

• Total energy of an object

• Total amount of matter inside an object

• Gravitational force that acts on object

Sample Y has density  $\rho=300\ \frac{kg}{m^3}$  and has volume of  $V=0.1\ m^3$  . If the gravity acceleration  $g=5\ \frac{m}{s^2}$  . What will be the object weight?

• 6 N

• 150 N

• 0.67 N

Which statement is true?

• Mass is a vector quantity

• Weight stays constant in every location

• Mass SI unit is kilogram

To measure object's weight we need ...

• measuring balance

• spring balance

• two-arm balance

What is the definition of weight?

• Gravitational force that act on an object

• Total amount of matter inside an object

• It is mass divides by gravity acceleration

Gravity acceleration in height function for planet UQ100 is  $g\left(h\right)=40-0.2h$  where h is height in m. What is the value of  $g$  if the height is 100 m?

•  $38\ \frac{m}{s^2}$  

•  $20\ \frac{m}{s^2}$  

•  $0\ \frac{m}{s^2}$