BEEd 22 - Pre Final

What is the weight of a 60 kg astronaut on Earth?

• 480 N

• 580 N

• 600 N

• 588 N

A 25 kg object is on a flat surface. What is the normal force acting on it?

• 2.5 N

• 25 N

• 245 N

• 250 N

A car tire has a coefficient of kinetic friction of 0.7 and a normal force of 4000 N. What is the frictional force?

• 28 N

• 280 N

• 2800 N

• 4000 N

What force is needed to start moving a 10 kg box on a surface with a static friction coefficient of 0.5?

• 49 N

• 50 N

• 98 N

• 490 N

On the Moon, gravity is 1/6th of Earth's. What would a 60 kg person weigh on the Moon?

• 98 N

• 588 N

• 980 N

• 4900 N

Why does a feather fall at the same rate as a rock in a vacuum?

• Feathers are lighter

• There's no gravity in a vacuum

• No air resistance affects the motion

• Rocks fall faster

What happens to a satellite if Earth’s gravity suddenly disappeared?

• It continues to orbit

• It crashes into Earth

• It stops in space

• It flies off into space

Why is it harder to stop a car on an icy road than on dry pavement?

• The car is heavier in winter

• Ice makes the tires expand

• Coefficient of friction is lower

• Gravity is weaker

Which real-world scenario best shows the importance of static friction?

• A sled sliding down a hill

• A ball rolling across grass

• A person walking on pavement

• A plane flying

How does friction benefit machinery when controlled properly?

• It increases heat

• It stops all motion

• It improves efficiency with lubrication

• It prevents machines from working