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SP9
GCSE Separate Science Physics
| Question | Answer |
|---|---|
| Give two examples of a contact force. (2) | Friction, air resistance, drag, push, pull etc. |
| What is the other type of force? (1) | Contact |
| How do you calculate the weight of an object? (1) | Weight = mass x gravitational force |
| What are the three magnetic materials? (3) | Iron, Nickel and Cobalt. |
| What is the relationship between the mass of an object and its gravitational pull? (1) | As the mass increases so does the strength of gravity. |
| When an object becomes positively charged, what has happened to the number of electrons it has? (1) | Decreased. |
| Where is a magnetic fields the strongest? (1) | At the poles / where the field lines are closest together. |
| Give two features of action-reaction forces. (2) | Act on different objects / act in the opposite direction / are the same type of force / They are the same size. |
| What is the name of the force which opposes your weight when you are standing or sitting on the ground? (1) | Normal reaction force. |
| How is a force represented on a diagram? (1) | As an arrow. |
| What is a vector? (2) | Something that has a magnitude and a direction. |
| What is a resultant force? (1) | A force that represents that represents to combined effect of all forces acting on the object. |
| What is the resultant force when a force of 4N pushes to the left, and a second force of 5N pushes to the right? (2) | 1N to the right. What two things occur when the resultant force acting on an object is zero? (2) |
| What is the name for a turning force? (1) | Moment |
| What is the unit for the answer to number 1? (1) | Nm / Newton meters |
| What is the rotational moment when a force of 10N is applied 4.5m from the pivot? (1) | 45 Nm. |
| What word is used to describe when two rotational moments cancel each other out? (1) The object is in. | Equilibrium. |
| What is the purpose of a lever? Explain how it is used to lift heavy objects (2) | It is used to magnify forces . The rotational moment you create must be bigger than that created by the load. |
| Calculate the resultant moment from in the following diagram 8N, 2m 2.5m. | Moment = (8x2) +( 3 x 2.5) = 16 + 7.5 = 23.5 Nm clockwise 1 mark for correct formula,1 mark for correct answer no. ,1 mark for direction stated. |
| To get a system into equilibrium the total clockwise forces must be equal to ….. what? | The total anticlockwise moment. |
| What is the equation linking kinetic energy, mass and velocity? | Ek= 0.5mv2 |
| What are the units of energy? | joules |
| What are the units of mass? | kilograms |
| What are the units of velocity? | metres per second |
| What is the equation linking gravitationa field strength, gravitational potential energy and height? | Ep=mgh |
| What are the units of gravitational field strength | newtons per kilogram |
| What is the equation linking energy transferred, power and time? | P=E/t |
| What are the units of power? | Watts |
| What is the definition of power? | Power is the rate of transfer of energy or the rate of doing work |
| What is the equation linking power, time and work done? | P=W/t |
| What is the unit of work done? | Joules (J) |
Created by:
Davenant Foundation School
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