MEDIUM
Lower Secondary Stage 7
IMPORTANT
Earn 100

Explain the direction of Earth’s gravitational force on different sides of the planet, for example at the north and south poles. Why does nobody fall off?

Important Questions on Forces and their Effects

MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 8
A sky-diver, dropping very fast, opens his parachute just a few hundred metres before reaching the ground. Draw and label a diagram and use it to explain the forces that act when the parachute first opens.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 8
A sky-diver, dropping very fast, opens his parachute just a few hundred metres before reaching the ground. Draw and label a diagram and use it to explain the forces that act just before he lands safely. What is the difference between these forces and the forces that act on him when the parachute first opens?
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 9
Dogs pull a sledge over a flat, icy surface. Their pulling force is 240 N forwards. Air resistance is 160 N and friction from the ice is 60 N. Calculate the size and direction of the overall resultant force on the sledge.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 9
Dogs pull a sledge over a flat, icy surface. Their pulling force is 240 N forwards. Air resistance is 160 N and friction from the ice is 60 N. Explain how you know whether the sledge is speeding up or slowing down.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 10
Explain why most of a swimmer’s body will normally be under the water level.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 11
Astronauts on a space mission travel from the Earth to the Moon. Describe the different sizes and directions of gravitational forces they experience when they are close to the Earth.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 11
Astronauts on a space mission travel from the Earth to the Moon. Describe the different sizes and directions of gravitational forces they experience when they are halfway between Earth and the Moon.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Cambridge Lower Secondary Science Stage 7 : Student's Book>Chapter 10 - Forces and their Effects>End of chapter review>Q 11
Astronauts on a space mission travel from the Earth to the Moon. Describe the different sizes and directions of gravitational forces they experience when they are when they have landed on the Moon.