Motion & Speed Calculations
A scooter travels 45 km in 1.5 hours. What is its speed?
A: 30 km/h
A graph shows a horizontal line. What does this indicate about motion?
A: Stationary object
What is the correct formula for force?
A: F = m × a
What is density?
A: Mass per unit volume
Which state has particles closest together?
A: Solid
A cyclist rides for 2 hours at 15 km/h. How far do they travel?
Answer: 30 km
A d-t graph shows steeper slope for Object A than B. Which moves more slowly?
Object B
A 4 kg object accelerates at 3 m/s². What force acts on it?
A: 12 N
A block has mass 120 g, volume 40 cm³. What is its density?
A: 3 g/cm³
Convert 2.8 kg to grams.
A: 2800 g
A horse runs 800 meters at 8 m/s. How long does it take in minutes and seconds
1 min 40 s
The line on a d-t graph rises steadily and then flattens. Describe the motion.
Constant speed then stop
Forces of 12 N left and 18 N right act on a cart. What is the resultant force?
A: 6 N right
Which floats in water: material A (ρ=0.8 g/cm³) or B (ρ=1.2 g/cm³)?
A: Material A
What direction does diffusion move: high to low or low to high?
High to low
A train goes 150 km at 60 km/h, then 120 km at 80 km/h. What is the total time?
A: 4 hours
Object X travels 30m in 5s; Object Y travels 15m in 3s. Which graph line is steeper?
Object X
A 2 kg mass accelerates at 5 m/s² under two forces: 15 N right and an unknown force left. Find the unknown force.
A: 5 N left (or 25N left)
A block of metal has volume = 100 cm³, mass = 800 g, and density = 8 g/cm³. If cut exactly in half, what is the density of one piece?
8 g/cm³ (same as original).
Why does ink diffuse faster in hot water than cold?
A: Particles move faster at higher temperatures
A plane flies a distance of 900 km. For the first half of the trip, it travels at 200 km/h. For the second half, it speeds up to 300 km/h. What is the total travel time?
Answer: 3.75 hours (or 3 hours 45 minutes)
Graph shows curved upward slope. What does this imply?
Acceleration
A rocket (mass 500 kg) experiences thrust 6000 N and gravity 4900 N. What is its acceleration?
A: 2.2 m/s² upward
If 500 ml of ethanol (ρ=0.8 g/cm³) is mixed with 500 ml water (ρ=1 g/cm³), what is the total mass?
A: 900 g
A swimming pool holds 75,000 L. How many mL is this?
75 million (75,000,000 mL)