Velocity and Gravity Flashcards
7 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Velocity and Gravity flashcards as text
A ball is dropped from rest. Approximately how fast is it falling after 3 seconds (ignoring air resistance)?
Answer: About 30 m/s
Velocity equals g times time, so 9.8 m/s² × 3 s ≈ 30 m/s.
Two balls of different mass are dropped together in a vacuum. Which hits the ground first?
Answer: They land at the same time
In a vacuum all objects fall at the same rate regardless of mass.
What is the difference between speed and velocity?
Answer: Velocity includes direction, speed does not
Velocity is a vector with magnitude and direction, while speed is only magnitude.
A car travels 100 meters in 5 seconds at constant speed. What is its velocity?
Answer: 20 m/s
Velocity equals distance divided by time, 100 m ÷ 5 s = 20 m/s.
An object thrown straight up has what velocity at the highest point of its path?
Answer: Zero velocity
At the peak the object momentarily stops before gravity pulls it back down.
Gravity on Earth causes objects to accelerate at approximately what rate?
Answer: 9.8 m/s²
Standard gravitational acceleration near Earth's surface is about 9.8 m/s².
If a runner increases speed from 2 m/s to 8 m/s in 3 seconds, what is the acceleration?
Answer: 2 m/s²
Acceleration is change in velocity over time, (8−2)/3 = 2 m/s².