Forces
What is the name of the unit of measurement for forces?
Newton (N)
What is the difference between speed and velocity?
Velocity includes direction; speed does not.
An object’s tendency to resist changes in motion is also known as:_______________
Inertia
What is the name of the force that pulls an object moving in a circle toward the center of its path?
Centripetal force.
A 10 kg toy car moves at 2 m/s. What is its momentum?
20 kg·m/s.
Which type of force keeps ice cubes floating in water?
Bouyant force
What term describes the total of all forces acting on an object?
Net force.
According to Newton’s Second Law, what two variables determine acceleration?
Net force and mass (F = m × a).
Why does velocity change in circular motion even if speed is constant?
Direction continuously changes, altering velocity
A car has a momentum of 20,000 kg·m/s while moving at 10 m/s. What is its mass?
2,000 kg
How is tensile force different from compressional force?
Tensile force pulls/stretches an object, while compressional force pushes/squeezes an object.
If a cyclist travels 30 meters in 5 seconds, what is their average speed?
6 m/s (calculated as distance/time = 30m ÷ 5s).
Why does a bowling ball need more force to accelerate than a marble?
Greater mass requires more force for the same acceleration (F = m × a).
Name an example of an object/activity that abuses circular motion to achieve a certain object. (for example: Satellite/planet orbiting the Earth/Sun - Give me a different kind of example
Roller Coaster, Lighting up charcoal, etc...
A 100 kg cannon fires a 5 kg cannonball at 20 m/s. What is the cannon’s recoil velocity?
v = 1 m/s
The gravitational force between two objects is DIRECTLY PROPORTIONAL to their: _______________________.
Masses
Why does a projectile follow a curved path?
Due to the combination of horizontal motion (constant speed) and vertical motion (gravity’s acceleration).
If a cyclist travels 30 meters in 5 seconds, what is their average speed?
6 m/s
If you spin a ball on a string in a horizontal circle and suddenly cut the string, in which direction will the ball fly? You may draw to illustrate what you mean.
The ball will fly straight outward along the tangent to the circle
If two ice skaters push off each other, why does the lighter skater glide away faster?
Momentum must be conserved. The lighter skater has less mass, so they gain more speed to balance the larger skater’s slower motion.
If Earth’s gravity exerts 1 N on a 100g object, how much force would it exert on a 1kg object?
10 N (since 1 kg = 1000g, 10 × 100g).
If a car accelerates from 0 to 60 m/s in 5 seconds, what is its acceleration?
REMEMBER a = vf-vi/t
Teams will only get full points IF the right unit of measurement is written.12 m/s2
If a 10 kg object accelerates at 2 m/s², what is the net force acting on it?
REMEMBER THE UNIT OF MEASUREMENT
20 N (F = 10 kg × 2 m/s²).
Why doesn't an orbiting satellite fly off into space or fall onto Earth? Describe the forces acting on it.
Gravity’s Pull: Earth’s gravity constantly tugs the satellite toward the planet, preventing it from escaping.
Forward Motion: The satellite’s high sideways speed (orbital velocity) means that as it falls toward Earth, the planet’s curvature causes the ground to "drop away" at the same rate.
A 0.02 kg bullet has a momentum of 10 kg·m/s. How fast is it moving
500 m/s