A planet orbits a star at a constant speed in a circular orbit.
Which of the statements below, about the force needed to maintain this motion, is correct?
No force is required
The force is directed away from the centre of the circle
The force is directed in the direction the planet is travelling
The force is directed towards the centre of the circle
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A car is driving round a circular track at a constant speed.
Which statement describes the motion of the car?
The car is accelerating because its speed is changing
The car is not accelerating as it is moving at a constant speed
The car is accelerating because its velocity is changing
The car is not accelerating, but its velocity is changing.
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In which of the following situations would no resultant force be required?
A motorbike travelling round a bend at a constant speed.
A rocket accelerating straight upwards into space.
A ship sailing at a constant speed across the ocean.
A Formula One car accelerating off the starting grid.
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The Moon orbits the Earth at a constant speed.
Which of the arrows on the diagram shows the direction of the resultant force on the Moon?
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A car starts from rest and rapidly increases speed.
There is a forward acting force on the car from the engine, and a backward acting force on the car from air resistance and friction.
Choose the force diagram and description that best describes the magnitude of the opposing forces.
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A skydiver is falling at terminal velocity. He has not yet opened his parachute.
He opens his parachute.
What is the direction of both the velocity of the skydiver, and his acceleration?
|
Direction of the skydiver’s velocity |
Direction of the skydiver’s acceleration |
|
|
A |
upwards |
upwards |
|
B |
upwards |
downwards |
|
C |
downwards |
upwards |
|
D |
downwards |
downwards |
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A bus drives along a flat road. Its engine produces a forward driving force of 7000 N. Drag forces, D also act on the bus.
The bus has an acceleration of 1.2 m/s2 and a mass of 2500 kg.
What is the value of D?
3000 N
4500 N
4917 N
4000 N
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The diagram shows four objects, each with a different mass. Each object is acted on by the forces shown.
Which object will experience the largest magnitude of acceleration?
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The graph below shows the journey of a truck along a straight, flat road.
During which part of the journey is the resultant force on the truck equal to zero?
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A car is driving on a motorway at a constant speed of 70 miles per hour.
The driver notices a queue of traffic up ahead and begins to slow down.
Which diagram best describes the resultant force acting on the car as it slows down?
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The diagram shows four objects, each with the same mass. Each object is acted on by the forces shown.
Which object will experience the largest acceleration to the left?
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A motorbike travels at a constant speed along a flat road. Three horizontal forces act on the motorbike. Two of them are shown in the diagram below.
What is the size and direction of the third force?
2800 N forwards
1200 N backwards
1200 N forwards
2800 N backwards
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An object with three forces acting on it is shown below.
What is the resultant force acting on the object?
90 N downwards.
110 N upwards
200 N downwards
90 N upwards
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Two students were discussing Newton's first and second laws of motion.
Which statement correctly summarises these two laws?
An object will not change its speed or direction unless a resultant force acts upon it equal to F = ma
An object will not move unless a force acts upon it
An object will speed up if a resultant force acts upon it equal to F = ma
An object will only change its direction if a force acts at a right angle to it
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A car slows down as it approaches a traffic light. The car was traveling at 13.5 m/s and it takes 22 s to come to a stop.
The mass of the car is 950 kg.
Calculate the force required to stop the car.
580 N
− 580 N
618 N
1548 N
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