# IGCSE Physics : Mass and Weight-Numerical Practice Questions

#### Directions: Use the equations to answer the following questions. Show your work and include the units.

1. Define Mass and give units.

2. Define Weight and write units.

3. Describe what will happen (if anything) to mass and weight when you go to the moon. Why would this happen?

4. Find the weight of a 60 kg astronaut on earth

a. Find the weight of the same object on a planet where the gravitational attraction has been reduced to 1/10 of the      earth’s pull. Show all work.

5. A backpack weighs 8.2 newtons and has a mass of 5 kg on the moon. What is the strength  of gravity on the moon? (Be    careful with units, remember 1N= 1 kg. m/s2)

6. A physical science text book has a mass of 2.2 kg

a. What is the weight on the Earth?

b. What is the weight on Mars (g = 3.7 m/s2 )

c. If the textbook weights 19.6 newtons on Venus, What is the strength of gravity on  Venus?

7. Of all the planets in our solar system, Jupiter has the greatest gravitational strength.

a. If a 0.5 kg pair of running shoes would weigh 11.55 newtons on Jupiter, what is the  strength of gravity there?

b. If he same pair of shoes weighs 0.3 newtons on Pluto, what is the strength of gravity on  Pluto?

c. What does the pair of shoes weigh on earth?

8.  Somewhere you place a 7.5 kg pumpkin on a spring scale.  If the scale reads 78.4 N, what is the  acceleration due to    gravity (g) at that location?

9.  With her parachute open, a 45 kg skydiver falls toward the Earth at a constant velocity of 10 m/s.

a. What is the weight of the skydiver?

b. What is the magnitude and direction of the drag force from the parachute on the skydiver?