1) A push is a force ________ the centre of the force. a) away from b) towards c) down d) up 2) A pull is a force ________ the centre of the force. a) away from b) towards c) up d) down 3) Gravity pulls objects away from Earth. a) TRUE b) FALSE 4) Gravity isn't an important force. a) TRUE b) FALSE 5) Without gravity we would fly off into space. a) TRUE b) FALSE 6) When you go down a slide, gravity pulls you to the top. a) TRUE b) FALSE 7) A force which tries to stop you when you go down a slide is _______ . a) gravity b) pull c) friction d) push 8) If a slide is smooth, the friction is bigger. a) TRUE b) FALSE 9) If a slide is rough, the friction is bigger. a) TRUE b) FALSE 10) If the friction is bigger, you go down more slowly. a) TRUE b) FALSE 11) On a smooth surface objects start sliding _________ . a) earlier b) later 12) On a rough surface objects start sliding _________ . a) later b) earlier

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