Forces

Homework Booklet

Name:

Class:

Homework

Number % Mark Parental Signature

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CfE Physics

Homework 1.

Name: Mark %

Use the proper layout, and show all your working to answer the following questions.

1. Calculate how far a car travels in 300 seconds when it is travelling at a top speed

of 30 m/s.

(3)

2. How long does it take to walk to school if you walk at an average speed of

3 m/s and you live 900 metres away?

(3)

3. Find the average speed of a motor boat which takes 350 seconds to cover a 10 000

m course.

(3)

4. A runner takes 35 seconds to run round 250 metres of a track. What is his

average speed?

(3)

5. A train travelling at 35 m/s takes 15 seconds to pass through a tunnel. How long is

the tunnel?

(3)

Total 15 marks

CfE Physics

Homework 2.

Name: Mark %

1. Find the average speed of Sammy Snail who slithers 0005 m in 4 seconds.

(3)

2. How long does the TGV train take to travel 60 000 m given that it goes at an

average speed of 120 km/h. (120 km/h = 333 m/s)

(3)

3. A school bus takes 20 minutes to travel 15 km. What is it’s average speed? (Give

your answer in m/s)

(3)

4. A bird maintains an average speed of 112 m/s for 5 minutes. How far does it

travel?

(3)

5. How long does a roller-blader take to travel 2 km if his average speed is 7 m/s.

(3)

Total 15 marks

CfE Physics

Homework 3.

Name: Mark %

1. A car travels from rest to 65 m/s in 10 seconds. What is its acceleration?

(3)

2. A speedboat travels from rest to 56 m/s in 56 seconds. What is its acceleration?

(3)

3. A cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. What is its acceleration?

(3)

4. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s

average acceleration?

(3)

5. A car advertisement states that a certain car can accelerate from rest to 70

km/h in 7 seconds. Find the cars average acceleration.

(3)

Total 15 marks

CfE Physics

Homework 4.

Name: Mark %

1. Name TWO ways in which you can apply a force to an object.

(a)

(b) (2)

2. Name TWO things that a force can do to an object.

(a)

(b) (2)

3 (a) When two surfaces move against each other, a force is always present. Name

this force.

(1)

(b) Give an example of a situation where we would like to reduce this force.

(1)

(c) Give an example of a situation where we would like to increase this force.

(1)

4. What unit is force measured in?

(1)

5. Some aircraft land at a high speed.

Explain how the parachute helps to slow down the aircraft:

(2)

Total 10 marks

CfE Physics

Homework 5.

Name: Mark %

1. Complete the following using words from the word bank below.

Smoother, motion, lubricating (oiling), rougher, opposes, slow down.

Friction is a force which ______________ the motion of an object. It can

cause an object to ________ _______ or to stop.

We can increase the force of friction between two surfaces by making the

surfaces _________. We can reduce the force of friction between two

surfaces by making them __________. Another way of reducing friction

between two surfaces is by _____________ them. (5)

2. Circle whether this is a situation where friction is useful (good) or unhelpful

(bad).

a) A rusty hinge Good/Bad

b) An air hockey game Good/Bad

c) A goalies gloves Good/Bad

d) A slide in the playground Good/Bad

e) The brakes on a bicycle Good/Bad

f) Car tyres Good/Bad (6)

3. What is a force?

(1)

Total 12 marks

CfE Physics

Homework 6.

Name: Mark %

1. (a) Look at the picture below, Explain what part X of the truck is there to do.

(1)

(b) Complete the statement by deleting the incorrect word.

Part X will help the truck to use MORE/LESS fuel. (1)

2. The two sheets of paper shown at dropped at the same time. Complete the

sentence below.

Sheet ____ will hit the floor first. (1)

Explain your choice.

(1)

[Turn over

X

A B

Flat sheet of paper Crumpled sheet of paper

3. Explain the two methods being used to reduce air friction, so that the motorbike

will go as fast as possible:

1.

2.

(2)

4. Give an example of a situation where a large air resistance is useful. Explain how

air resistance is being used.

(2)

5. Find out what a wind tunnel is, and what it is used for.

(2)

Total 10 marks

CfE Physics

Homework 7.

Name: Mark %

1. Complete the following:

Mass is the amount of material in an object, mass is measured in ___________.

Weight is a ________ due to __________.

Here on Earth g = 10 N/kg, bwe call “g” the

_______________ _______ __________. (2)

2. When we travel to other planets, the value of “g” changes.

This means that your ________ will change, but your ______ will always stay the

same.

(2)

3. Find the missing values in the following table. (Show all your working.)

Weight Mass g

(a) 300 10

(b) 230 10

(c) 0.2 11.7

(6)

CfE Physics

Homework 8.

Name: Mark %

1. Find the weight of a 50 kg person on Earth.

(3)

2. Find the mass of Mary who has a weight of 625 N.

(3)

Planet

Gravitational Field

Strength (N/kg)

Earth 10

Moon 1.6

Mercury 4

Jupiter 2

Saturn 9

Neptune 11

3. An alien has a mass of 120 kg. He says that on his own planet, he has a weight of

1320 N. What planet is he from?

(4)

4. An astronaut has a weight of 800 N on Earth.

What is his mass: (a) on Earth

(b) on the Moon

(c) in outer space?

(a)

(3)

(b)

(1)

(c)

(1)

Total 15 marks

CfE Physics

Homework 9.

Name: Mark %

1. Explain what is meant by an unbalanced force.

(2)

2. For the situations shown below, calculate the size and direction of the unbalanced

force.

(2)

(2)

(2)

(2)

20 N 50 N 10 N

200 N 100 N

20 N 20 N

10 N

10 N

CfE Physics

Homework 10.

Name: Mark %

1. What are the two quantities that Pressure depends on?

(2)

2. How could you calculate the Pressure if you know these quantities?

(1)

3. What unit is Pressure measured in?

(1)

3. Give three examples of a force acting on a small area to give high Pressure.

(i)

(ii)

(iii) (3)

4. Give three examples of a force acting over a large area to give small Pressure.

(i)

(ii)

(iii) (3)

[Turn over

5. Calculate the Pressure caused by a Force of 2 000 N acting over an area of

100 cm2.

(3)

6. Using your knowledge of Physics, explain how drawing pins are able to be pushed

into notice boards.

(2)

Total 15 marks