Physics: Forces and Motion Flashcards
6 cards from real GCSE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Physics: Forces and Motion flashcards as text
What happens to the acceleration of an object if the resultant force is doubled but mass stays the same?
Answer: Acceleration doubles.
From F = ma, if F doubles and m is constant, then a must double to maintain the equation.
A car brakes from 20 m/s to rest over 40 m. What is its deceleration?
Answer: 5 m/s²
Using v² = u² + 2as: 0 = 400 + 2a×40, so a = -400/80 = -5 m/s² (deceleration of 5 m/s²).
Which of the following best describes inertia?
Answer: The tendency of an object to resist changes in its state of motion.
Inertia is the tendency of an object to resist changes to its velocity, linked to Newton's First Law.
On a velocity-time graph, what does a horizontal straight line indicate?
Answer: Constant speed (zero acceleration)
A horizontal line on a v-t graph means velocity is not changing, so acceleration = 0 and speed is constant.
What is the stopping distance of a vehicle equal to?
Answer: Thinking distance + Braking distance
Stopping distance = thinking distance (distance travelled during driver's reaction time) + braking distance (distance travelled while brakes are applied).
A 500 g ball travelling at 6 m/s has what momentum?
Answer: 3 kg·m/s
Momentum = mass × velocity = 0.5 kg × 6 m/s = 3 kg·m/s.