1 Gravity, Friction, Energy, Simple Machines

Which object will experience the least gravitational pull on Earth?

• A. A 5 kg dog

• B. A 70 kg adult

• C. A 0.5 kg kitten

• D. A 20 kg suitcase

On which planet would you weigh the most?

• Earth

• Mars

• Jupiter

• Mercury

If an object has a mass of 10 kg, what is its weight on Earth?

• 10 N

• 98 N

• 9.8 N

• 100 N

Which of the following statements is TRUE about gravity?

• A. Gravity pushes objects upward.

• B. Gravity only exists on Earth.

• C. Gravity is stronger with more mass.

• D. Gravity is the same everywhere in the universe.

Which action reduces friction?

• Adding sand to a surface

• Using oil to lubricate a surface

• Increasing surface roughness

• Pressing surfaces together harder

What happens when friction is too low between car tires and the road?

• A. The car can stop easily

• B. The car may slide and lose control

• C. The tires wear out faster

• D. The road becomes rougher

Which 2 examples show friction at work?

• Ice skating on smooth ice

• A pencil writing on paper

• A leaf falling from a tree

• A balloon floating in air

What type of energy does a stretched rubber band have?

• Kinetic energy

• Chemical energy

• Potential energy

• Thermal energy

Which of the following shows energy conservation at home?

• Leaving the TV on overnight

• Using energy-efficient LED lights

• Leaving the refrigerator door for a long time

• Using multiple appliances at the same time

A moving car has what kind of energy?

• Potential energy

• Electrical energy

• Kinetic energy

• Sound energy