Forces and Acceleration

Question 1

What happens if the force on the object is unbalanced and the resultant force is on the same direction as the motion

Answer 1

It will accelerate

Question 2

What happens if the force on the object is unbalanced and the resultant force is on the opposite direction as the motion

Answer 2

It will decelerate

Question 3

What happens if the force on the object is unbalanced and the resultant force is zero

Answer 3

The object will remain at rest or at a constant velocity

Question 4

What is the resultant force

Answer 4

All the forces added together, the single force that has the dame effect as all the forces together.

Question 5

What is the equation that links the resultant force, mass and acceleration

Answer 5

Resultant force = Mass x acceleration

Question 6

What is acceleration measured in

Answer 6

m/s²

Question 7

What is the resultant force measured in

Answer 7

Newtons

Question 8

What is measured in Kg

Answer 8

The mass

Question 9

A car has 1,000kg. What force must the car’s engine supply to cause an acceleration of 2 m/s²

Answer 9

1000 x 2

= 2000N

Question 10

Describe an experiment to investigate force and acceleration

Answer 10

Place a piece of card on a trolly
Get a light gate and set up to appropriate hight
Get another light gate and place 50cm apart
Place the trolly to piece of string, of which has 140g attached.
Release trolly and catch at end
Repeat using different masses

Question 11

Mass is not a……

Answer 11

Force

Question 12

Weight is a……

Answer 12

Force

Question 13

What is weight caused by

Answer 13

The pull of gravity acting on a mass. Like other forces, weight is measured in newtons and has both a magnitude and direction

Question 14

Give the equation that links weight, mass and gravitational field strength

Answer 14

weight = mass x gravitational field strength

Question 15

What is the gravitational field strength on Earth

Answer 15

10 N/Kg

Question 16

What is terminal velocity

Answer 16

The final speed of which an object can reach naturally

Question 17

How is terminal velocity reached

Answer 17

When falling, weight is larger than the upward air resistance, therefore the object accelerates.

As the object speeds up, the drag increases

Drag eventually equals the weight. The force is balanced! Terminal velocity has been reached

Question 18

In a vacuum, how come a bowling ball travels as fast a s a feather

Answer 18

No air resistance

Question 19

At terminal velocity, are there forces acting on the object

Answer 19

Yes, they are just balanced, so the object continues to fall at a constant rate