Some examples from this set of practice questions
1.
What is the difference between speed and velocity?
Answer: Speed and velocity are different concepts in physics. Speed is the rate of change of motion, or how fast something moves24. Velocity is the speed with a direction, or how fast something moves in a certain direction. Speed is a scalar quantity, which means it only has a magnitude. Velocity is a vector quantity, which means it has both a magnitude and a direction
2.
Calculate the acceleration of a car that goes from 20 m/s to 40 m/s in 5 seconds.
Answer: Given, u = 20 m / s v = 40 m / s t = 4 s e c Acceleration is a measure of the change in velocity over time. Change in velocity is Δ v = v − u Δ v = 40 m / s − 20 m / s = 20 m / s Since this change in velocity takes place over 4 seconds, Car acceleration is a = Δ v Δ t a = 20 m / s 4 s = 5 m / s 2
3.
State Newton’s second law of motion.
Answer: Newton’s second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass, and that the direction of the acceleration is the same as the direction of the net force
4.
Explain why a rocket moves forward when its engines expel exhaust gases backward.
Answer: Newton\'s third law of motion states that to every action there is an equal and opposite reaction. Similarly, when a rocket moves, it exerts the action force on the gases to expel them backwards which in turn exerts an equal and opposite reaction force to move the rocket forward.
5.
Define work done by a force.
Answer: In physics, the work done by a force is the energy transferred to or from an object via the application of force along a displacement. The work done by a force is the product of the displacement and the component of the applied force of the object in the direction of displacement. Mathematically, the work done by a force is expressed as W = Fd, where W is the work done by the force, F is the force, and d is the displacement caused by force
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