Grade 7 Science Revision Q3

When does something accelerate in the direction opposite to its direction

of motion?

• when it speeds up

• when it slows down

• when it has stopped

• when it travels backwards

If you use two different reference points to describe the position of the

same object, how will your descriptions differ?

• they will always differ in distance

• they will always differ in direction

• either in distance or direction or both

• either in distance or direction but not both

Which type of force(s) will cause a change in an object's motion?

• inertia

• zero net force

• balanced forces

• unbalanced forces

What feature(s) determine an object's acceleration?

• the forces acting on it and its size

• the forces acting on it and its mass

• its weight and its mass

• the forces acting on it only

If three people pushing on a car each apply a force of 100 N, how much force does the car exert on each person?

• 33 N

• 100 N

• 300 N

• it depends on the mass of each person

Why is Newton's first law sometimes called the law of inertia?

• because inertia is the tendency of objects to resist changes to their motion

• because inertia describes the application of force to an object at rest

• because inertia describes the application of force to an object in motion

• because inertia is the same thing as friction

Displacement measures the _________ between the starting and stopping points.

• mass and volume

• distance and direction

• distance and speed

• direction and speed

Which is distance divided by time?

• speed

• displacement

• velocity

• acceleration

When a car goes around a curve at 20 mph, the __________ changes.

• speed

• average speed

• instantaneous speed

• velocity

A(n) __________ is a push or a pull.

• motion

• acceleration

• force

• velocity