Physics Praxis

The law of universal gravitation states that any two objects in the uni-verse that have mass, without exception,

• attract each other.

• repel each other.

• combine to provide a balanced force.

• create friction

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According to the law of conservation of momentum, when two objects collide in the absence of outside forces,

• velocity decreases

• velocity increases

• the objects have the same momentum before and after they collide.

• the objects have more momentum after they collide than they did before.

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According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail

• creates a friction with the hammer.

• disappears into the wood.

• exerts an equal and opposite force on the hammer.

• moves at a constant speed.

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A skydiver with a mass of 70 kg accelerates to Earth at a rate of 9.8 m/s2 due to gravity. What is the force on the skydiver?

• 79.8 Newtons

• 7.14 Newtons

• 0.14 Newtons

• 68.60 Newtons

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What in this image most represents physics?

• Tiger

• Fireworks

• Mountain

• Airplane

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Define the term inertia.

• the amount of matter in an object

• the amount of space an object takes up

• the tendency of an object to resist a change in motion, determined by mass

• The force that one surface exerts on another when the two rub against each other

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What happens when two forces act in the same direction?

• They cancel each other out.

• The stronger one prevails.

• Their strengths are added.

• Their sum divided by two is the total force.

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The greater the mass of an object,

• the easier the object starts moving.

• the greater its inertia.

• the more balanced it is.

• the more space it takes up.

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The force of gravity on a person or object on the surface of a planet is called

• mass.

• weight.

• terminal velocity

• free fall.

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The force that one surface exerts on another when the two rub against each other is called

• friction.

• inertia.

• acceleration

• gravity