Motion
Which statement is the correct definition of speed?
A car travels 9000 m in 5.0 minutes. What is the speed of the car?
A ball is thrown at 5.0 m s⁻¹ to the east. It bounces off a wall and returns at 5.0 m s⁻¹ to the west. Which statement about the ball’s speed and velocity is correct?
A runner completes the first 100 m of a race in 10 s and the next 100 m in 15 s. What is the average speed for the whole race?
On a distance–time graph, which feature indicates that an object is accelerating?
A distance–time graph shows a straight line from (0 s, 0 m) to (4 s, 32 m). What is the speed of the object during this interval?
A speed–time graph shows a horizontal line at 15 m s⁻¹ for 10 s, followed by a straight line sloping down to 0 m s⁻¹ over the next 6.0 s. What is the total distance travelled?
Which statement correctly describes what the area under a speed–time graph represents?
Two objects are dropped from the same height in a vacuum. Object X has a mass of 2.0 kg and object Y has a mass of 10 kg. Which statement is correct?
A delivery drone flies 2.4 km due north in 4.0 minutes, then hovers stationary for 2.0 minutes while it lowers a package. What is the average speed of the drone for the entire 6.0 minutes?
Which statement is the correct definition of acceleration?
A car increases its velocity from 5.0 m s⁻¹ to 25 m s⁻¹ in 8.0 s. What is the acceleration of the car?
A train travelling at 72 km/h brakes uniformly and stops in 10 s. What is the acceleration of the train?
On a speed–time graph, a straight line rises from (0 s, 0 m s⁻¹) to (5.0 s, 15 m s⁻¹), then curves and gradually flattens to a horizontal line at 20 m s⁻¹. Which statement correctly describes the acceleration during these sections?
A cyclist travelling at 18 m s⁻¹ applies the brakes and decelerates uniformly at 3.0 m s⁻². What is the distance travelled before the cyclist stops?
A skydiver jumps from an aircraft. Which row correctly describes the resultant force and acceleration at the instant of jumping and at terminal velocity?
A stone is dropped from rest in air (not a vacuum). Its speed–time graph is a curve that starts steep and gradually flattens. A student claims the stone experiences constant acceleration throughout its fall. Suggest two pieces of evidence from the graph that disprove the student’s claim. Which pair of observations correctly disproves the claim?
An astronaut on the Moon drops a hammer and a feather simultaneously from the same height. The Moon has no atmosphere. The acceleration due to gravity on the Moon is 1.6 m s⁻². Which statement correctly predicts the outcome?
A speed–time graph shows an object moving at 8.0 m s⁻¹ for 5.0 s, then accelerating uniformly to 20 m s⁻¹ over the next 4.0 s. Calculate the total distance travelled in the 9.0 s.
A car completes the first half of a 10 km journey at 20 m s⁻¹ and the second half at 30 m s⁻¹. A student calculates the average speed as (20 + 30) ÷ 2 = 25 m s⁻¹. What is the correct average speed, and why is the student wrong?