Force & motion
What is the formula for acceleration?
A= net force/ mass
What is the formula for speed?
Speed = distance ÷ time
Heat transfer by direct contact is called…?
Conduction
What is the highest point of a wave called?
Crest
Which cart would have the lowest acceleration:
High mass + small net force or Low mass + large net force?
High mass + small net force (lowest acceleration)
A box is pushed with 40 N and friction pushes back with 10 N. What is the net force?
What is the difference between speed and velocity?
Velocity includes direction, speed does not.
Heat transfer through fluids rising and sinking is called…?
Convection
What is the distance between two crests called?
Wavelength
A runner travels 40 m in 5 s. What is their average speed?
8 m/s
If the net force on a 10 kg cart is 20 N, what is its acceleration?
2 m/s²
A car travels 100 m in 5 s. What is its speed?
20 m/s
Heat from the Sun reaching Earth is an example of…?
Radiation
If a wave has a large amplitude, what does that mean?
It has more energy
Explain why a metal spoon in hot soup gets hot.
Heat transfers through conduction
Which two things cause LOW acceleration?
Large mass and small net force
What does a steeper line mean on a distance-time graph?
Faster speed
Which has the highest average kinetic energy:
water at 10°C or water at 50°C?
Water at 50°C
Two waves travel through the same medium. Wave X has a frequency of 10 Hz and a wavelength of 4 m. Wave Y has a frequency of 20 Hz and a wavelength of 2 m. How do the energies of the two waves compare?
Wave Y has more energy because it has higher frequency and shorter wavelength.
A 20-kg cart is pushed with a force of 50 N, and the frictional force is 10 N.
What is the cart’s acceleration?
Acceleration = F ÷ m = 40 ÷ 20 = 2 m/s²
A ball exits a curved tube. What path does it follow? And which of newtons laws is represented?
A straight line in the same direction it was traveling (Newton’s 1st Law)
A cyclist travels 12m east, then 12m west in 15 second. What is the cyclist’s average speed?
1.6 m/s
Why does air rise in a chimney?
Warm air becomes less dense and rises (convection)
What properties increase wave energy?
Shorter wavelength larger amplitude & higher frequency
A student heats water in a pot. After a few minutes, warm water begins rising to the top while cooler water sinks to the bottom.
Explain which type of heat transfer is happening
This is convection.