FORCES - Revision

Two students push a box. Student A pushes with 20 N to the right, and Student B pushes with 15 N to the left. What is the net force on the box?

• 35 N right

• 5N right

• 5N left

• 35N left

When you slide a book across a table, it slows down because of:

• Gravity pulling it down

• Friction between the book and table

• The weight of the book

• The net force being zero

A chair is stationary on the floor. The forces acting on it are:

• Unbalanced, causing it to move

• Only friction so it slides

• Only gravity, so it falls

• Balanced, so it stays still

A car accelerates when:

• The forces on it are unbalanced

• The forces on it are balanced

• There is no friction acting on it

• Gravity stops acting on it

What is the difference between mass and weight?

• Mass is measured in Newtons, weight is measured in kilograms

• Mass is how much matter an object has, weight is the force of gravity on it

• Mass and weight are the same thing

• Weight is how much matter an object has, mass is the force of gravity

Why do objects fall to the ground when dropped?

• Friction pulls them down

• The objects are too heavy

• Gravity pulls them toward Earth

• The net force is zero

Which surface would create the most friction for a sliding block?

• Ice

• Sandpaper

• Glass

• Water

An astronaut weighs less on the Moon than on Earth because:

• There is no friction on the Moon

• The astronaut has less mass on the Moon

• The Moon has less gravity

• The forces are balanced on the Moon

When a book rests on a table, the forces are balanced. What happens if you push it with 10 N to the right and friction opposes with 8 N?

• The book stays still

• The book moves to the left

• The book moves to the right

• The book moves upward

Which of the following is an example of an unbalanced force?

• A chair standing still on the floor

• A book resting on a shelf

• A ball starting to roll after being kicked

• A car moving at constant speed