Balanced forces, Kinetic energy and gravitational potential energy

Question 1

What is a balanced force?

Answer 1

When two forces acting on an object are equal in size but act in opposite directions.

Question 2

What determines the kinetic energy of an object?

Answer 2

Mass and speed

Question 3

What is the equation for calculating kinetic energy?

Answer 3

KE = ½ mv2

Question 4

What determines the amount of gravitational potential energy of an object?

Answer 4

Mass and height above ground

Question 5

What book has the greatest amount of gravitational potential enrgy out of A and C?

Answer 5

A because the book is higher

Question 6

What book has the greatest amount of gravitational potential enrgy out of A and B?

Answer 6

B because it has a bigger mass

Question 7

What happens when an object reaches its terminal velocity?

Answer 7

When an object falls at its terminal speed, the speed doesn’t increase, so the kinetic energy doesn’t increase. However, the gravitational potential energy continues to decrease.

Question 8

1. If the speed of an item is doubled what happens to the kinetic energy?
2. If the mass of an item is doubled what happens to the kinetic energy?

Answer 8

1. The kinetic energy is quadrepuled
2. The kinetic energy is doubled