P4: Forces And Energy

Question 1

What is Work

Answer 1

Energy transferred by a force.

Question 2

Work(J) =

Answer 2

Force (N) x Distance moved in the direction of force (m)

Question 3

What is needed for work to be done?

Answer 3

Energy

Question 4

What is work done to overcome friction transferred as?

Answer 4

Energy that heats the objects that rub together and energy that heats the surroundings.

Question 5

Power

Answer 5

The rate at which energy is transferred per second.

Watt

Question 6

Power (W) =

Answer 6

Useful energy transferred (J) / Time taken

Question 7

Gravitational Potential Energy

Answer 7

Energy of an object due to its position in a gravitational field.

Question 8

When an object is moved up… (higher height)

Answer 8

… Its GPE increases

Question 9

GPE is equal to…

Answer 9

… The weight of an object

Question 10

Change in GPE (J) =

Answer 10

Weight (N) x Change of height (m)
OR
Mass (kg) x GFS (N/kg) x Change in height (m)

Question 11

Kinetic Energy (J) =

Answer 11

1/2 x mass (kg) x speed(2) (m/s(2))

Question 12

Elastic Potential Energy

Answer 12

The energy stored in an elastic object when work is done on it.

Question 13

What does the kinetic energy of an object depend on?

Answer 13

mass and speed

Question 14

Kinetic Energy

Answer 14

The energy of a moving object due to its motion.