Lesson 7 Physics and Chemistry

What force helps to brake the bike?

• Gravity
• Momentum
• Air resistance
• Friction

Gecko has __________ feet.

• cohesion

• adhesion

• lubricant

• aerodynamic

Which are the examples of lubricant?

• sugar and salt

• sand and soil

• Oil and soap

• water

What is the friction that slows an object through air or water?

• Momentum
• Inertia
• Friction
• Drag

What shape allows an object to move through fluids without as much drag?

• Boxy shape
• Aerodynamic shape

• Flat shape
• Rough shape

Which law stated that the sun is pulling on every planet?

• Kepler's Laws of Planetary Motion
• The Law of Conservation of Energy
• Newton's Law of Universal Gravitation
• Einstein's Theory of Relativity

Galileo demonstrated that two different cannon balls reached the ground at the same time.

• True

• False

The maximum speed for skydiver to fall is

• 150 mph

• 90 mph

• 200 mph

• 122 mph

What force pulled the sky divers?

• Wind resistance
• Magnetic force
• Buoyancy
• Gravity

Which forces cancel out the gravity forces on the sky diver?

• Centrifugal force and magnetic force
• Inertia and drag force

• Frictional force and tension force
• Normal force and elastic force