What is a scalar? - A scalar is a quantity that has only magnitude (size) and no direction., What is a vector? - A vector is a quantity that has both magnitude and direction., What do you use to calculate the resultant vector? - Pythagoras theorem, How do you find the direction of a vector? - use trigonometry to find the bearing, What does the area under a velocity v time graph give? - It gives the displacement of the object., What is the definition of acceleration? - Acceleration is defined as change in velocity per unit time, What is the definition of speed? - Speed is defined as the distance covered per unit time., State Newton's first law of motion? - An object at rest will remain at rest, and an object in motion will continue moving at a constant velocity, unless acted upon by an unbalanced force., State Newton's second law of motion?, State Newton's third law of motion? - That for every action, there is an equal and opposite reaction., State the conservation of energy principle. - Energy cannot be created or destroyed; it can only be transformed from one form to another., If an object has a constant velocity what do you know about the forces acting on the object? - The forces are balanced., If an object is accelerating, what do you know about the forces acting on the object? - The forces are unbalanced., Describe free fall in terms of forces? - Free fall is the motion of an object under the influence of gravity alone, with no other forces acting on it, Describe terminal velocity in terms of forces. - Terminal velocity is the constant speed reached by an object when the force of gravity pulling it downward is balanced by the air resistance, If an object finishes at its starting point, what is its displacement? - 0 metres., State four ways to reduce friction? - Streamlining; lubrication; make surfaces smoother; reduce surface area in contact, State four ways to increase friction. - Remove lubrication; make surfaces rougher; increase surface area in contact; bluffing, What is the main energy transfer in friction? - Kinetic to heat, What are the two components of projectile motion? - Horizontal & vertical components., What is the force acting on a satellite in orbit? - Weight, Are the forces acting on a satellite balanced or unbalanced? - Unbalanced (contsantly changes direction), What happens to the mass of an object if it went to another planet? - It would stay the same., What happens to the weight of an object if it went to another planet? - Its weight would change depending on the gravitational field strength of the other planet., How does a satellite remain in orbit? - A satellite stays in orbit because gravity pulls it toward Earth, while its horizontal velocity is fast enough to prevent it from falling and maintain a constant altitude.,

N5 Physics - Dynamics Quiz (flashcards)

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