G7 Newton's Laws of Motion Quiz

What does Newton's First Law of Motion state? 牛顿第一运动定律说明了什么？

• An object in motion stays in motion unless acted upon by an unbalanced force.

• Force equals mass times acceleration.

• Every action has an equal and opposite reaction.

• Energy cannot be created or destroyed.

Inertia is best described as: 惯性最好被描述为：

• The tendency of an object to resist changes in its motion.物体抵抗其运动变化的趋势。

• The force that causes objects to accelerate.
  导致物体加速的力。

• The energy stored in a moving object.运动物体中储存的能量。

• The speed at which an object moves.物体移动的速度。

If a car suddenly stops, why do passengers lurch forward?
如果汽车突然停下来，为什么乘客会向前倾斜？

• Due to gravity pulling them down.
  由于重力将它们拉下。

• Because of inertia—their bodies tend to stay in motion.由于惯性——他们的身体倾向于保持运动。

• The seatbelt applies a backward force. 安全带施加向后的力。

• The car’s brakes push them forward.汽车的刹车将他们推向前方。

Which of the following demonstrates inertia?下列哪项表现了惰性？

• A ball rolling downhill.
  一个球滚下山坡。

• A book sliding to a stop on a table.一本书在桌子上滑行并停止。

• A rocket accelerating upward.一枚加速向上的火箭。

• A person pushing a heavy box.一个人推着一个沉重的箱子。

An object at rest will remain at rest unless acted upon by: 静止的物体将保持静止状态，除非受到以下作用：

• Gravity.重力。

• An unbalanced force.
  一种不平衡的力量。

• Friction.摩擦。

• Air resistance.空气阻力。

Why do astronauts in space float even though low intensity gravity is present?为什么宇航员在太空中即使重力较小也能漂浮？

• There is no air resistance in space. 太空中没有空气阻力。

• They are in a constant state of free-fall (inertia).
  它们处于持续的自由落体状态（惯性）

• Space has zero gravity.
  太空中没有重力。

• Their suits are designed to float. 他们的潜水服设计成可以漂浮。

If you pull a tablecloth out from under dishes quickly, the dishes stay in place due to: 如果您快速从餐具下方拉出桌布，餐具会保持在原位，因为：

• Friction.摩擦。

• Gravity. 重力。

• Inertia. 惯性。

• Air pressure. 气压。

Which scenario violates Newton’s First Law? 哪种情况违反了牛顿第一定律？

• A rolling ball slows down due to friction. 滚动的球由于摩擦而减速。

• A hockey puck slides forever on ice (no friction).
  冰球在冰上永远滑动（没有摩擦力）。

• A car stops when brakes are applied. 踩刹车时汽车就会停下来。

• A ball suddenly changes direction without any force. 一个球在没有任何力量的情况下突然改变方向。

A passenger in a moving car is thrown sideways when the car turns sharply. This is because: 行驶中的汽车急转弯时，乘客会被甩向一侧。这是因为：

• The car’s seat pushes them.汽车座椅推着他们。

• Inertia keeps them moving in the original direction. 惯性使它们保持着原来的方向运动。

• Gravity pulls them sideways. 重力将它们拉向一侧

• The tires lose traction. 轮胎失去牵引力。

Newton’s First Law is also called: 牛顿第一定律又称：

• The Law of Acceleration.加速度定律。

• The Law of Action-Reaction. 作用-反作用定律。

• The Law of Inertia.
  惯性定律。

• The Law of Gravity. 万有引力定律。