MEDIUM
Lower Secondary Stage 7
IMPORTANT
Earn 100
An ice skater turns in a circle at a steady speed. Draw and label a diagram to name three forces acting on her skate and mark each with an arrow to show its direction.
Important Questions on Forces and their Effects
MEDIUM
Lower Secondary Stage 7
IMPORTANT
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?
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Dogs pull a sledge over a flat, icy surface. Their pulling force is forwards. Air resistance is and friction from the ice is . Calculate the size and direction of the overall resultant force on the sledge.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Dogs pull a sledge over a flat, icy surface. Their pulling force is forwards. Air resistance is and friction from the ice is . Explain how you know whether the sledge is speeding up or slowing down.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Explain why most of a swimmer’s body will normally be under the water level.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
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
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
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.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Astronauts on a space mission travel from the Earth to the Moon. Is there is any point on the journey when their measured weight would be zero? Explain where and why.
