1. FORCES HOMEWORK Kinross High School Science Department Curriculum for Excellence

2. Instructions There are three homework exercises to be done during the Forces topic. Each one is marked out of 10 Do not write on these sheets. Make sure you get it handed in on time. Good luck!

3. Homework One Question 1. a) What is the unit used for force? b) Give an example of when you used a force today. Question 2. Draw a diagram of a Newton balance and show how it is used to measure the size of a force. Question 3. What are the three things that an unbalanced force change about an object? Question 4. a)Are these forces balanced or unbalanced? b)What is the size of the unbalanced force? (1) (3) (1) 50N

4. Question 1. a) What units are used to measure friction? b) Copy and complete the table below c) State two ways that friction can be reduced. Question 2. a) If a school bag has mass of 15kg on Earth what is the size of it’s mass on the Moon? b) A pupil called David has a mass of 55kg, what is his weight on Earth? c) How could David lose his weight without going on a diet? (1) (2) (1) Friction is usefulFriction is not useful i)iii) ii)iv) Homework Two (page 1) (2) Useful Data: On Earth g = 10 N/kg On the Moon g = 1.6 N/kg

5. Question 3. If a box has a mass of 45 kg, what is the smallest size of force that would be needed to lift it? (2) Homework Two (page 2) m= 45 kg Lifting force = ?

6. Question 1. a)How many poles does a magnet have and what are they called? b) What is the area around a magnet called? Question 2. In this experiment, when the power supply is switched on object X starts to attract metal objects like paper clips. a)What is object X called? b)State two things you could alter about this experiment to make object X attract more paper clips (2) Homework Three (1) X (2)

7. Time to revise