Describe what characterizes science and explain the difference between a hypothesis, a theory and a scientific law. Explain Newton’s 3 laws of motion by using the example of a rollercoaster.

Breakdown and explain, in terms of frame of reference, if you’re inside a moving train everything on the outside can seem to be moving.

Propose a way to explain to someone the differences between the terms: speed, velocity and acceleration.

If you’re in a car moving at a high speed, and you stop abruptly, what would happen when wearing a seatbelt as opposed to not wearing a seat belt? Which of Newton’s 3 laws would apply?

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is