# Worksheet 3

```Name: ____________________________
Form: _______
Worksheet 4 - Weight.
Exercise1: Say whether the following statements are True or False:
i. Mass and weight are not the same thing.
__________
ii. Since weight is a force, it is measured in Newtons.
_________
iii. A rock on Earth has a smaller mass than it has on the moon.
_________
iv. The mass of an object is the quantity in that object.
_________
v. Weight does not change from place to place.
_________
vi. A 13 year old boy has a mass of approximately 45 Newtons
_________
Exercise2: Use the triangle shown below to complete the following formulae.
Weight = ___________________
mass = ___________________
gravity = ___________________
weight
mass x gravity
Exercise 3: Find the weight (on the Earth’s surface) of the following objects.
[Note: gravity on Earth = 10 N/kg]
a) a girl whose mass is 40kg
Weight = mass x gravity = 40x10 = 400N
b) a book of mass 2kg
___________________________________
c) 1.5kg of sand
___________________________________
d) 1kg of potatoes
___________________________________
e) an apple whose mass is 300g
___________________________________
Exercise 4: Use your formula in exercise 2 to find the mass of the following
objects.
a) a box of weight 20N
__________________________
b) a can of sausages of weight 0.5N
__________________________
c) a desk of weight 150N
__________________________
d) a basketball of weight 0.7N
__________________________
e) a stereo of weight 10N
__________________________
```