O Level Pure Physics TYS Dynamics
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Question 1 of 8
1. Question1 point(s)
A swimmer of mass 60 kg dives into a deep pool from a high diving platform. She enters the water at high speed and then decelerates at a rate of 16m/s² as she travels vertically downwards in the water. The gravitational field strength is 10N/kg.
What is the swimmer’s weight and the size of the resultant force acting on her as she decelerates?CorrectIncorrect
Write down the formula for weight and for resultant force first.
Question 2 of 8
2. Question1 point(s)
Experiments are carried out on the Moon and on Earth. There is no atmosphere on the Moon and the gravitational field strength on the Moon is less than that on Earth.
A coin and a feather are dropped at the same instant from the same height.
Which statement is correct for the experiment on the Moon?CorrectIncorrect
When there is no atmosphere, there would be no air resistance acting on falling objects.
Question 3 of 8
3. Question1 point(s)
The cable of a crane is used to lift a load of mass 500 kg and weight 5000 N. The cable exerts a force of 7500 N on the load.
What is the acceleration of the load?CorrectIncorrect
Consider the resultant force acting on the load first.
Question 4 of 8
4. Question1 point(s)
A car of mass 800 kg has a forward acceleration of 2.5 m/s². A frictional force of 1200N opposes the motion of the car.
What is the driving force due to the engine of the car?CorrectIncorrect
Consider the resultant force acting on the car first.
Question 5 of 8
5. Question1 point(s)
A parachutist of mass 80 kg is falling through air when he opens his parachute. After the parachute opens, the total air resistance acting is initially 2400 N.
The gravitational field strength g is 10 N/kg.
What is the initial deceleration of the parachutist after the parachute opens?CorrectIncorrect
Consider the formula F = ma.
Question 6 of 8
6. Question1 point(s)
The propeller on a boat pushes water backwards with a force of 2000 N. The boat moves through the water against a total resistive force of 1800 N.
What is the forward force on the propeller due to the water?CorrectIncorrect
For Newton’s third law, an equal and opposite force acts on the object.
Question 7 of 8
7. Question1 point(s)
A man pushes a heavy box along the ground.
A force acts between the man’s hands and the box.
Another force acts between the man’s feet and the floor.
In which direction do these forces act on the man?CorrectIncorrect
Friction prevents the feet from sliding to the left.
Question 8 of 8
8. Question1 point(s)
A car has a mass of 800 kg. The car’s engine exerts a driving force of 2500 N on it. This causes the car to accelerate at 2.0 m/s².
What is the total resistive force acting on the car?CorrectIncorrect
Calculate the resultant force using F = ma.