Quiz on Forces for Grade 8

Which of the following describes a force?

• A. a pull only

• B. a push only

• C. a push or pull or both

• D. neither a push nor a pull

What is the unit of force in metric system?

• A. Calorie

• B. Joules

• C. Newtons

• D. Pounds

How do forces occur?

• A. in pairs

• B. in triplets

• C. by themselves

• D. as single quantity

When you move a chair across the floor, what force must your push be stronger than?

• A. friction

• B. magnetic

• C. normal

• D. tension

A 500-N lady sits on the floor. How much force the floor exerts on her?

• A. 50 N

• B. 250 N

• C. 500 N

• D. 1000 N

Which force always pulls the objects to the ground?

• A. applied

• B. friction

• C. gravitational

• D. tension

A leaf falls from a tree. What force(s) are acting on it?

• A. Air resistance only

• B. Gravitational force only

• C. Applied force and air resistance

• D. Air resistance and gravitational forces

When a cabinet touches the floor, which type of forces exist?

• A. Contact forces

• B. Balanced forces

• C. Non-contact forces

• D. Unbalanced forces

The Earth has a bigger mass than the Moon. If you were able to travel to the Moon, what happens to your weight?

• A. increases

• B. decreases

• C. stays the same

• D. varies with day and night

What is the net force in the figure below?

• A. 1 N, to the left

• B. 1 N, to the right

• C. 11 N, to the left

• D. 11 N, to the right