Vật Lý Kỹ Thuật Quiz

What property does uniform linear motion have?

• The coordinates of the point mass are a linear function of time.

• The distance traveled decreases over time.

• Velocity increases over time.

• Acceleration is always positive.

When two objects of different masses are dropped from a height in a vacuum, which conclusion is correct?

• Both objects hit the ground at the same time.

• The heavier object hits the ground before the lighter one.

• The heavier object hits the ground after the lighter one.

• It is indeterminate which object hits the ground first.

In which case does an object not experience the effect of a net force (or any force)?

• Uniform motion.

• Uniform circular motion.

• Accelerating uniformly.

• Decelerating uniformly.

What is free fall?

• The fall of objects only under the influence of gravity.

• The fall of objects only under the influence of drag force.

• The fall of a leaf in the air.

• The fall of a steel ball in the air.

What property does the momentum of an object in uniform linear motion have?

• Constant.

• Changes direction, magnitude remains constant.

• Does not change direction, magnitude changes.

• Changes both direction and magnitude.

Which object's fall in the air can be considered free fall?

• An object with low density.

• An object with high density.

• A small object.

• A large object.

A car is decelerating with an initial speed of 18 km/h. In the 5th second from the start of deceleration, the car travels a distance of 2.75 m. What is the magnitude of the car's acceleration?

• 0.5 m/s²

• 1.0 m/s²

• 1.5 m/s²

• 2.0 m/s²

In the last 2 seconds, how far did an object in free fall travel?

(a)  

What is the magnitude of the acceleration of the car?

• 0.5 m/s²

• 1.0 m/s²

• 1.5 m/s²

• 2.0 m/s²

From what height was the object dropped if it fell 40 m in the last 2 seconds?

• 22.5 m

• 45 m

• 90 m

• 180 m