Forces and Motion Flashcards
What is the formula for calculating force?
(Easy)
Force (F) is calculated using the formula F = m \times a , where m is mass and a is acceleration.
What is Newton’s First Law of Motion?
(Easy)
Newton’s First Law of Motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Define inertia.(Easy)
Inertia is the tendency of an object to resist changes in its state of motion.
If a car has a mass of 1000 kg and accelerates at 2 m/s², what is the force applied?
The force applied is F = m x a = 1000 kg x 2{m/s}^2 = 2000 N
What is the difference between weight and mass?
Mass is the amount of matter in an object and is measured in kilograms (kg), while weight is the force exerted by gravity on that object and is measured in newtons (N).
A 5 kg object is acted upon by a 20 N force. What is the object’s acceleration?
The acceleration is a = f/m = 20N/5kg = 4 m/s^2
Explain the concept of terminal velocity.
Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium (air, for example) prevents further acceleration.
A car is traveling at a constant speed of 20 m/s. What is the resultant force acting on the car?
If the car is traveling at a constant speed, the resultant force acting on it is zero because there is no acceleration.
If an object is dropped from a height of 10 meters, what is its speed just before it hits the ground?
14 m/s
Describe the difference between scalar and vector quantities, giving two examples of each.
Scalar quantities have only magnitude (e.g., mass, temperature), while vector quantities have both magnitude and direction (e.g., force, velocity).
A 10 kg box is pulled with a force of 50 N at an angle of 30° to the horizontal. Calculate the horizontal component of the force.
43
