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Question 1 of 8
1. Question
1 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?
CorrectIncorrectHint
Write down the formula for weight and for resultant force first.
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Question 2 of 8
2. Question
1 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?
CorrectIncorrectHint
When there is no atmosphere, there would be no air resistance acting on falling objects.
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Question 3 of 8
3. Question
1 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?
CorrectIncorrectHint
Consider the resultant force acting on the load first.
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Question 4 of 8
4. Question
1 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?
CorrectIncorrectHint
Consider the resultant force acting on the car first.
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Question 5 of 8
5. Question
1 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?
CorrectIncorrectHint
Consider the formula F = ma.
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Question 6 of 8
6. Question
1 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?
CorrectIncorrectHint
For Newton’s third law, an equal and opposite force acts on the object.
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Question 7 of 8
7. Question
1 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?
CorrectIncorrectHint
Friction prevents the feet from sliding to the left.
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Question 8 of 8
8. Question
1 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?
CorrectIncorrectHint
Calculate the resultant force using F = ma.
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