11 mark
In which situation does the force cause a rotation?
Bouncing on a trampoline
Hitting a nail with a hammer
Pushing a friend on a swing
Sitting on a chair
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2.6 Forces in Action
21 mark
A student puts different weights on four balances.
Which balance will give a clockwise moment?
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31 mark
On Mars the gravitational field strength is 4.0 N/kg.
How much would a 60 kg person weigh on Mars?
Use the equation: weight = mass × gravitational field strength
15 N
64 N
240 N
600 N
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41 mark
Which one of the following uses of forces causes a rotation?
Lowering a book vertically from a shelf
Opening a door
Lifting a book vertically onto a shelf
Sitting in the centre of a see-saw
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51 mark
On the Moon the gravitational field strength is 1.6 N/kg.
Calculate the gravity force for an 80 kg astronaut.
Use the equation: gravity force = mass × gravitational field strength
50 N
128 N
800 N
1280 N
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11 mark
The graph shows the relationship between mass and weight on two different planets.
The weight of an object on planet X is 3.0 N.
What is the weight of the same object on planet Y?
1.5 N
2.0 N
4.0 N
6.0 N
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21 mark
The diagram shows 2 gears.
Gear X is rotated clockwise at 1.0 rotation per second.
Which row describes the movement of gear Y?
| direction of rotation |
rotations per second |
|
| A | anticlockwise | 0.5 |
| B | anticlockwise | 2.0 |
| C | clockwise | 0.5 |
| D | clockwise | 2.0 |
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31 mark
The diagram shows 3 gears.
Gear X is rotated clockwise at 1.0 rotations per second.
Which row describes the movement of gear Z?
| Direction of rotation |
Rotations per second |
|
| A | anticlockwise | 0.5 |
| B | anticlockwise | 2.0 |
| C | clockwise | 0.5 |
| D | clockwise | 2.0 |
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41 mark
A man lifts a load using a wheelbarrow.
What is the effort needed to lift the load using the wheelbarrow?
100 N
120 N
250 N
144 N
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11 mark
What is the smallest number of forces needed to bend an object?
1
2
3
4
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21 mark
A student sets up two cogs.
Cog A has 10 teeth and cog B has 20 teeth.
Cog A is turned 2 times.
How many times does cog B turn?
0.5 times
1 time
2 times
20 times
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31 mark
A uniform 1.0 m rod is pivoted at its centre.
The rod is in equilibrium.
What is the anti-clockwise moment about the pivot?
10 N m
15 N m
40 N m
100 N m
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41 mark
A student measures the weight of four boxes and the area in contact with the ground.
| Box | Weight (N) | Area (cm2) |
| A | 50 | 100 |
| B | 75 | 250 |
| C | 90 | 400 |
| D | 100 | 500 |
Which box exerts the greatest pressure on the ground?
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51 mark
An elephant has a weight of 60 kN. Its four feet have a total area of 0.75 m2 in contact with the ground.
Calculate the total pressure the elephant exerts on the ground.
Use the equation: pressure = force normal to a surface ÷ area of that surface
45 Pa
80 Pa
45 000 Pa
80 000 Pa
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61 mark
An astronaut on the Moon lifts a 5.5 kg object a vertical distance of 50 cm.
Calculate the potential energy gained by the object.
Gravitational field strength on the Moon = 1.6 N/kg.
4.4 J
8.8 J
17.6 J
440 J
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71 mark
A diver stands on a diving board. He weighs 400 N.
What is the moment of the force provided by the diver around the pivot?
320 Nm anti-clockwise
320 Nm clockwise
500 Nm anti-clockwise
500 Nm clockwise
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81 mark
A pump lifts 500 kg of water to a water tank at the top of a building.
The water gains 240 000 J of gravitational potential energy.
The gravitational field strength is 10 N/kg.
Use the equation: Potential energy = Mass × Height × Gravitational field strength
Calculate the height of the water tank.
4.8 m
48 m
240 m
480 m
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91 mark
A piston is pushed in a cylinder containing a fluid.
Use the equation: pressure = force ÷ area
What is the pressure on the fluid?
20 Pa
80 Pa
160 Pa
200 Pa
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101 mark
A see-saw is in equilibrium.
What is the value of force F?
3.0 N
3.5 N
5.0 N
5.3 N
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